Headphones, head-external positioning filter determination device, head-external positioning filter determination system, head-external positioning filter determination method and program

Abstract

The head external positioning filter determination system (500) involved in this embodiment includes: a headset (43), a microphone unit (2), a measurement processing device (201) and a server device (300). The measurement processing device (201) measures a first external auditory canal transfer characteristic from a first position to the microphone, measures a second external auditory canal transfer characteristic from a second position to the microphone, and sends user data related to the first external auditory canal transfer characteristic to the server device. The server device (300) includes: a storage unit (303) for storing first preset data and second preset data in association with each other; a comparison unit (302) for comparing the second preset data with the user data; and an extraction unit (304) for extracting the first preset data based on the comparison result.

Description

Technical Field

[0001] The present invention relates to a headset, an off-head positioning filter determination device, an off-head positioning filter determination system, an off-head positioning filter determination method and a program. Background Art

[0002] As a sound image localization technology, there is an outside-head localization technology that uses headphones to localize the sound image outside the listener's head. In the outside-head localization technology, the characteristics from the headphones to the ears are eliminated and four characteristics from the stereo speakers to the ears are given, thereby localizing the sound image outside the head.

[0003] In the head-out localization reproduction, the measurement signal (pulse sound, etc.) emitted from the speaker of two channels (hereinafter referred to as ch) is recorded by a microphone (hereinafter referred to as a microphone) installed on the ear of the listener himself (user). Then, the processing device creates a filter based on the picked-up signal obtained by the impulse response. By convolving the generated filter with the 2ch audio signal, the head-out localization reproduction can be realized.

[0004] Furthermore, in order to generate a filter for canceling the characteristics from the headphone to the ear, a microphone placed on the listener's ear is used to measure the characteristics from the headphone to the ear to the eardrum (also called external auditory canal transfer function ECTF, external auditory canal transfer characteristics).

[0005] Patent document 1 discloses a binaural hearing device using an external sound image localization filter. In this device, a spatial transfer function pre-measured by many people is transformed into a feature parameter vector corresponding to the auditory characteristics of a person. In addition, the device uses clustering to collect a small amount of data. Furthermore, the device clusters the pre-measured spatial transfer function and the real ear headphone reverse transfer function according to the body size of the person. In addition, the data of the person closest to the center of gravity of each group is used.

[0006] Patent document 2 discloses an external head positioning filter determination device including a headset and a microphone unit. In patent document 2, a server device stores first preset data related to spatial acoustic transfer characteristics from a sound source to a subject's ear and second preset data related to external auditory canal transfer characteristics of the subject's ear in association with each other. A user terminal measures measurement data related to the user's external auditory canal transfer characteristics. The user terminal sends user data based on the measurement data to the server device. The server device compares the user data with a plurality of second preset data. The server device extracts the first preset data based on the comparison result.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 8-111899

[0010] Patent Document 2: Japanese Patent Application Publication No. 2018-191208 Summary of the invention

[0011] In such an external head positioning process, it is preferable to use an appropriate filter and therefore it is preferable to perform appropriate measurement.

[0012] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a headphone, an outside-head positioning filter determination device, an outside-head positioning filter determination system, an outside-head positioning filter determination method, and a program capable of determining an appropriate filter.

[0013] The head external positioning filter determination system involved in this embodiment includes: an output unit, which is worn by a user and outputs sound to the ear of the user; a microphone unit, which is worn by the ear of the user and has a microphone, and the microphone picks up the sound output from the output unit; a measurement processing device, which outputs a measurement signal to the output unit and obtains the picked-up signal output from the microphone unit to measure the external auditory canal transfer characteristic; and a server device, which can communicate with the measurement processing device, and the measurement processing device, when the driver of the output unit is located at a first position, measures a first external auditory canal transfer characteristic from the first position to the microphone, and measures a second position different from the first position to the microphone. The second external auditory canal transfer characteristic is configured to send user data related to the first and second external auditory canal transfer characteristics to the server device, and the server device includes: a data storage unit, which stores first preset data and second preset data in association with each other, wherein the first preset data is related to the spatial acoustic transfer characteristic from the sound source to the ear of the subject, and the second preset data is related to the external auditory canal transfer characteristic of the ear of the subject, and the data storage unit stores multiple first and second preset data obtained for multiple subjects; a comparison unit, which compares the user data with multiple second preset data; and an extraction unit, which extracts the first preset data from multiple first preset data based on the comparison result of the comparison unit.

[0014] The method for determining an off-head localization filter according to the present embodiment determines an off-head localization filter for a user using an output unit and a microphone unit, wherein the output unit is worn by the user and outputs sound to the ear of the user, and the microphone unit is worn by the ear of the user and has a microphone, and the microphone picks up the sound output from the output unit, and the method for determining an off-head localization filter includes the following steps: measuring a first external auditory canal transfer characteristic from a driver of the output unit located at a first position to the microphone and a second external auditory canal transfer characteristic from a driver of the output unit located at a second position to the microphone; acquiring user data based on the measured data related to the first and second external auditory canal transfer characteristics; associating first preset data with second preset data, and storing a plurality of the first and second preset data acquired for a plurality of subjects, wherein the first preset data is related to the spatial acoustic transfer characteristic from a sound source to the ear of the subject, and the second preset data is related to the external auditory canal transfer characteristic of the ear of the subject; and extracting the first preset data from the plurality of first preset data by comparing the user data with the plurality of second preset data.

[0015] The computer-readable storage medium storing a program according to the present embodiment is used to cause a computer to execute a method for determining an external head localization filter, the method for determining an external head localization filter for a user using an output unit and a microphone unit, the output unit being worn by the user and outputting sound to the ear of the user, the microphone unit being worn by the ear of the user and having a microphone, the microphone picking up the sound output from the output unit, the method for determining an external head localization filter comprising the following steps: measuring a first external auditory canal transfer characteristic from a driver of the output unit located at a first position to the microphone and a second external auditory canal transfer characteristic from a driver of the output unit located at a second position to the microphone; acquiring user data based on the measured data related to the first and second external auditory canal transfer characteristics; associating first preset data with second preset data, and storing a plurality of the first and second preset data acquired for a plurality of subjects, the first preset data being related to the spatial acoustic transfer characteristic from a sound source to the ear of the subject, and the second preset data being related to the external auditory canal transfer characteristic of the ear of the subject; and extracting the first preset data from the plurality of first preset data by comparing the user data with the plurality of second preset data.

[0016] The headset involved in this embodiment includes: a headphone band; left and right shells, which are arranged on the headphone band; a guide mechanism, which is respectively arranged on the left and right shells; a driver, which is respectively configured in the left and right shells; and an actuator, which moves the driver along the guide mechanism.

[0017] The headset involved in this embodiment includes: a headphone band; left and right inner shells, which are fixed on the headphone band; multiple drivers, which are respectively fixed on the left and right inner shells; and an outer shell, which is respectively arranged on the outside of the left and right inner shells, and its angle relative to the inner shell is variable.

[0018] According to the present embodiment, it is possible to provide headphones, an outside-head positioning filter determination device, an outside-head positioning filter determination system, an outside-head positioning filter determination method, and a program that can determine an appropriate filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 : is a block diagram showing the head outer positioning processing device of this embodiment.

[0020] Figure 2 It is a diagram showing the structure of a measuring device for measuring spatial acoustic transfer characteristics.

[0021] Figure 3 This is a diagram showing the structure of a measuring device for measuring the external auditory canal transfer characteristics.

[0022] Figure 4 1 is a diagram showing the overall configuration of the head external positioning filter determination system according to the present embodiment.

[0023] Figure 5 is a schematic diagram showing the configuration of a driver of a headphone.

[0024] Figure 6 1 is a diagram showing a configuration of a server device in the head-outside positioning filter determination system.

[0025] Figure 7 is a table showing the data structure of preset data stored in the server device.

[0026] Figure 8 : is a table showing the data structure of preset data in Modification Example 1.

[0027] Fig. 9 This is a schematic diagram showing headphones in Embodiment 2.

[0028] Fig.10 This is a table showing the data structure of preset data in the second embodiment.

[0029] Fig.11 is a table showing the data structure of preset data.

[0030] Fig.12 1 is a front view of a headphone showing sensor example 1.

[0031] Fig.13 It is a front view showing the wearing state of the measurement subjects 1 having different face widths.

[0032] Fig.14 This is a front view of a headset showing sensor example 2.

[0033] Fig.15 It is a front view showing the wearing state of the measurement subjects 1 having different face lengths.

[0034] Fig.16 1 is a top view of a headphone showing sensor example 3.

[0035] Fig.17 It is a top view showing wearing states at different rotation angles.

[0036] Fig.18 1 is a top view of a headphone showing sensor example 4.

[0037] Fig.19 It is a top view showing wearing states with different hanging angles.

[0038] Fig. 20 It is a table showing preset data when shape data is used.

[0039] Fig.21 This is a top view schematically showing the headphones according to the fourth embodiment.

[0040] Fig. 22 This is a diagram showing a state where the position of the driver is changed in the headphones according to the fourth embodiment.

[0041] Fig.23 1 is a plan view schematically showing headphones according to Modification 2.

[0042] Fig.24 It is a diagram for explaining a wearing state of headphones according to Modification 2.

[0043] Fig.25 A diagram for explaining the arrangement of a speaker and a driver. DETAILED DESCRIPTION

[0044] (summary)

[0045] First, an overview of the sound image localization processing is described. Here, an out-of-head localization processing as an example of a sound image localization processing device is described. The out-of-head localization processing of this embodiment uses spatial acoustic transfer characteristics and external auditory canal transfer characteristics to perform out-of-head localization processing. Spatial acoustic transfer characteristics are transfer characteristics from a sound source such as a speaker to the external auditory canal. The external auditory canal transfer characteristics are transfer characteristics from the entrance of the external auditory canal to the eardrum. In this embodiment, the external auditory canal transfer characteristics in a state of wearing headphones are measured, and the measured data are used to implement the out-of-head localization processing.

[0046] The head positioning processing of this embodiment is performed by a user terminal such as a personal computer (PC), a smart phone, a tablet terminal, etc. The user terminal is an information processing device having a processing component such as a processor, a storage component such as a memory, a hard disk, a display component such as an LCD monitor, a touch panel, a button, a keyboard, a mouse, etc. The user terminal has a communication function for sending and receiving data. In addition, an output component (output unit) having a headset or earphone is connected to the user terminal.

[0047] In order to obtain a high-quality localization effect, it is preferred to measure the user's own characteristics to generate an out-of-head localization filter. The user's personal spatial acoustic transfer characteristics are generally measured in a listening room with complete acoustic characteristics of audio equipment such as speakers or indoor sound equipment. That is, the user needs to go to the listening room or prepare a listening room at the user's home. Therefore, there is a case where the user's personal spatial acoustic transfer characteristics cannot be properly measured.

[0048] Even if a user sets up speakers at home or the like and prepares a listening room, the speakers may be set asymmetrically, or the acoustic environment of the room may not be suitable for listening to music. In such cases, it is difficult to measure appropriate spatial acoustic transfer characteristics at home.

[0049] On the other hand, the user's personal external auditory canal transfer characteristics are measured while wearing a microphone unit and headphones. That is, if the user wears a microphone unit and headphones, the external auditory canal transfer characteristics can be measured. The user does not need to go to a listening room or prepare a listening room in the user's home. In addition, the generation of measurement signals for measuring external auditory canal transfer characteristics, the recording of picked-up signals, etc. can be performed using user terminals such as smartphones and PCs.

[0050] Thus, it is sometimes difficult for an individual user to measure the spatial acoustic transfer characteristics. Therefore, the head-outside positioning processing system according to this embodiment determines a filter corresponding to the spatial acoustic transfer characteristics based on the measurement result of the external auditory canal transfer characteristics. That is, based on the measurement result of the external auditory canal transfer characteristics of the individual user, the head-outside positioning processing filter suitable for the user is determined.

[0051] Specifically, the head external positioning processing system includes a user terminal and a server device. The server device pre-stores the spatial acoustic transfer characteristics and external auditory canal transfer characteristics measured in advance for multiple subjects other than the user. That is, a measurement device different from the user terminal is used to measure the spatial acoustic transfer characteristics using a speaker as a sound source (hereinafter also referred to as the first advance measurement) and the external auditory canal transfer characteristics using a headphone as a sound source (hereinafter also referred to as the second advance measurement). The first advance measurement and the second advance measurement are performed on subjects other than the user.

[0052] The server device stores first preset data corresponding to the result of the first preliminary measurement and second preset data corresponding to the result of the second preliminary measurement. A plurality of first preset data and a plurality of second preset data are obtained by performing the first and second preliminary measurements on a plurality of subjects. The server device stores the first preset data on the spatial acoustic transfer characteristics and the second preset data on the external auditory canal transfer characteristics in association with each subject. The server device stores the plurality of first preset data and the plurality of second preset data in a database.

[0053] Furthermore, for the individual user who performs the head positioning processing, the user terminal is used to measure only the external auditory canal transfer characteristics (hereinafter referred to as user measurement). The user measurement is the same as the second preliminary measurement, and is a measurement using headphones as the sound source. The user terminal obtains measurement data on the external auditory canal transfer characteristics. Then, the user terminal sends user data based on the measurement data to the server device. The server device compares the user data with multiple second preset data respectively. The server device determines the second preset data with a high correlation with the user data from the multiple second preset data based on the comparison result.

[0054] Then, the server device reads the first preset data associated with the second preset data having a high correlation. That is, the server device extracts the first preset data suitable for the user from the plurality of first preset data based on the comparison result. The server device sends the extracted first preset data to the user terminal. Then, the user terminal performs head positioning processing using a filter based on the first preset data and an inverse filter based on the user's measurement.

[0055] Implementation Method 1

[0056] (Head external positioning processing device)

[0057] first, Figure 1 An outside-head localization processing device 100 is shown as an example of a sound field reproduction device according to the present embodiment. Figure 1It is a block diagram of the head-external positioning processing device 100. The head-external positioning processing device 100 reproduces the sound field for the user U wearing the headphone 43. Therefore, the head-external positioning processing device 100 performs sound image localization processing on the stereo input signals XL and XR of Lch and Rch. The stereo input signals XL and XR of Lch and Rch are analog audio reproduction signals output from a CD (Compact Disc) player, etc., or digital audio data such as mp3 (MPEG Audio Layer-3). In addition, the head-external positioning processing device 100 is not limited to a physically single device, and different devices can also be used to perform part of the processing. For example, part of the processing can also be performed by a PC, etc., and the remaining processing can be performed by a DSP (Digital Signal Processor) built into the headphone 43, etc.

[0058] The head positioning processing device 100 includes a head positioning processing unit 10, filter units 41, 42, and headphones 43. The head positioning processing unit 10, filter units 41, 42 constitute a calculation processing unit 120 described later, and specifically, can be realized by a processor.

[0059] The head-external positioning processing unit 10 includes convolution operation units 11 to 12, 21 to 22 and adders 24 and 25. The convolution operation units 11 to 12, 21 to 22 perform convolution processing using spatial acoustic transfer characteristics. Stereo input signals XL and XR from a CD player or the like are input to the head-external positioning processing unit 10. The spatial acoustic transfer characteristics are set in the head-external positioning processing unit 10. The head-external positioning processing unit 10 convolves the stereo input signals XL and XR of each channel with a filter of the spatial acoustic transfer characteristics (hereinafter also referred to as a spatial acoustic filter). The spatial acoustic transfer characteristics can be a head transfer function HRTF measured by the head or auricle of the person being measured, or a head transfer function of a simulated head or a third party.

[0060] A function that combines four spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs into a set is referred to as a spatial acoustic transfer function. Data used for convolution in the convolution operation units 11, 12, 21, and 22 become spatial acoustic filters. The spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs are measured using a measuring device described below.

[0061] Then, the convolution operation unit 11 convolves the stereo input signal XL of Lch with the spatial acoustic filter corresponding to the spatial acoustic transfer characteristic Hls. The convolution operation unit 11 outputs the convolution operation data to the adder 24. The convolution operation unit 21 convolves the stereo input signal XR of Rch with the spatial acoustic filter corresponding to the spatial acoustic transfer characteristic Hro. The convolution operation unit 21 outputs the convolution operation data to the adder 24. The adder 24 adds the two convolution operation data and outputs them to the filter unit 41.

[0062] The convolution operation unit 12 convolves the stereo input signal XL of Lch with the spatial acoustic filter corresponding to the spatial acoustic transfer characteristic Hlo. The convolution operation unit 12 outputs the convolution operation data to the adder 25. The convolution operation unit 22 convolves the stereo input signal XR of Rch with the spatial acoustic filter corresponding to the spatial acoustic transfer characteristic Hrs. The convolution operation unit 22 outputs the convolution operation data to the adder 25. The adder 25 adds the two convolution operation data and outputs them to the filter unit 42.

[0063] In the filter sections 41 and 42, an inverse filter for eliminating the headphone characteristics (the characteristics between the reproduction unit of the headphone and the microphone) is set. Then, the regenerated signal (convolution operation signal) that has been processed in the head external positioning processing section 10 is convolved with an inverse filter. The filter section 41 convolves the Lch signal from the adder 24 with an inverse filter. Similarly, the filter section 42 convolves the Rch signal from the adder 25 with an inverse filter. When the headphone 43 is worn, the inverse filter eliminates the characteristics from the headphone unit to the microphone. The microphone can be arranged at a position between the entrance of the external auditory canal and the eardrum. The inverse filter is calculated based on the measurement results of the characteristics of the user U himself.

[0064] The filter unit 41 outputs the corrected Lch signal to the left unit 43L of the headphone 43. The filter unit 42 outputs the corrected Rch signal to the right unit 43R of the headphone 43. The user U wears the headphone 43. The headphone 43 outputs the Lch signal and the Rch signal to the user U. Thus, the sound image localized outside the head of the user U can be reproduced.

[0065] In this way, the head-outside positioning processing device 100 uses the spatial acoustic filter corresponding to the spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs and the inverse filter of the headphone characteristic to perform the head-outside positioning processing. In the following description, the spatial acoustic filter corresponding to the spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs and the inverse filter of the headphone characteristic are summarized as the head-outside positioning processing filter. In the case of a 2ch stereo reproduction signal, the head-outside positioning filter is composed of 4 spatial acoustic filters and 2 inverse filters. Then, the head-outside positioning processing device 100 performs the head-outside positioning processing by performing convolution operation processing on the stereo reproduction signal using a total of 6 head-outside positioning filters.

[0066] (Equipment for measuring spatial acoustic transfer characteristics)

[0067] use Figure 2 A measurement device 200 for measuring the spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs will be described. Figure 2 1 is a diagram schematically showing a measurement configuration for performing a first preliminary measurement on the subject 1 .

[0068] like Figure 2 As shown, the measurement device 200 includes a stereo speaker 5 and a microphone unit 2. The stereo speaker 5 is installed in a measurement environment. The measurement environment may be a room in the home of the user U, a store selling audio systems, a showroom, etc. The measurement environment is preferably a listening room with speakers and sound.

[0069] In this embodiment, the measurement processing device 201 of the measurement device 200 performs arithmetic processing for appropriately generating a spatial acoustic filter. The measurement processing device 201 includes, for example, a music player such as a CD player. The measurement processing device 201 may also be a personal computer (PC), a tablet terminal, a smart phone, etc. In addition, the measurement processing device 201 may also be a server device itself.

[0070] The stereo speakers 5 include a left speaker 5L and a right speaker 5R. For example, the left speaker 5L and the right speaker 5R are provided in front of the person to be measured 1. The left speaker 5L and the right speaker 5R output impulse sounds and the like for performing impulse response measurement. Hereinafter, in this embodiment, the number of speakers as sound sources is set to 2 (stereo speakers) for explanation, but the number of sound sources used in the measurement is not limited to 2, as long as it is 1 or more. That is, this embodiment can also be applied in a so-called multi-channel environment such as 1ch monaural or 5.1ch, 7.1ch, etc.

[0071] The microphone unit 2 is a stereo microphone having a left microphone 2L and a right microphone 2R. The left microphone 2L is provided at the left ear 9L of the measured person 1, and the right microphone 2R is provided at the right ear 9R of the measured person 1. Specifically, the microphones 2L and 2R are preferably provided at the positions from the entrance of the external auditory canal of the left ear 9L and the right ear 9R to the eardrum. The microphones 2L and 2R pick up the measurement signal output from the stereo speaker 5 and obtain the picked-up signal. The microphones 2L and 2R output the picked-up signal to the measurement processing device 201. The measured person 1 can be either a person or a simulated head. That is, in the present embodiment, the measured person 1 is not only a person but also includes the concept of a simulated head.

[0072] As described above, the impulse response is measured by measuring the impulse sound output by the left speaker 5L and the right speaker 5R using the microphones 2L and 2R. The measurement processing device 201 stores the picked-up sound signal obtained by the impulse response measurement in a memory or the like. Thus, the spatial acoustic transfer characteristic Hls between the left speaker 5L and the left microphone 2L, the spatial acoustic transfer characteristic Hlo between the left speaker 5L and the right microphone 2R, the spatial acoustic transfer characteristic Hro between the right speaker 5R and the left microphone 2L, and the spatial acoustic transfer characteristic Hrs between the right speaker 5R and the right microphone 2R are measured. That is, the left microphone 2L picks up the measurement signal output from the left speaker 5L to obtain the spatial acoustic transfer characteristic Hls. The right microphone 2R picks up the measurement signal output from the left speaker 5L to obtain the spatial acoustic transfer characteristic Hlo. The left microphone 2L picks up the measurement signal output from the right speaker 5R to obtain the spatial acoustic transfer characteristic Hro. The right microphone 2R collects the measurement signal output from the right speaker 5R to acquire the spatial acoustic transfer characteristic Hrs.

[0073] In addition, the measuring device 200 may also generate a spatial acoustic filter corresponding to the spatial acoustic transfer characteristics Hls, Hlo, Hro, Hrs from the left and right speakers 5L, 5R to the left and right microphones 2L, 2R based on the picked-up sound signal. For example, the measuring processing device 201 intercepts the spatial acoustic transfer characteristics Hls, Hlo, Hro, Hrs with a predetermined filter length. The measuring processing device 201 may also correct the measured spatial acoustic transfer characteristics Hls, Hlo, Hro, Hrs.

[0074] Thus, the measurement processing device 201 generates a spatial acoustic filter for the convolution operation of the head external positioning processing device 100. Figure 1As shown, the head-outside localization processing device 100 performs head-outside localization processing using a spatial acoustic filter corresponding to the spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs between the left and right speakers 5L and 5R and the left and right microphones 2L and 2R. That is, the head-outside localization processing is performed by convolving the spatial acoustic filter with the audio reproduction signal.

[0075] The measurement processing device 201 performs the same processing on the sound pickup signals corresponding to the spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs, respectively. That is, the same processing is performed on the four sound pickup signals corresponding to the spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs, respectively. In this way, spatial acoustic filters corresponding to the spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs can be generated, respectively.

[0076] (Determination of transfer characteristics of external auditory canal)

[0077] Next, use Figure 3 A measuring device 200 for measuring the external auditory canal transfer characteristic will be described. Figure 3 A configuration for performing a second preliminary measurement on the subject 1 is shown.

[0078] The microphone unit 2 and the headphone 43 are connected to the measurement processing device 201. The microphone unit 2 includes a left microphone 2L and a right microphone 2R. The left microphone 2L is worn on the left ear 9L of the measured person 1. The right microphone 2R is worn on the right ear 9R of the measured person 1. The measurement processing device 201 and the microphone unit 2 can be connected to Figure 2 The measurement processing device 201 and the microphone unit 2 may be the same or different.

[0079] The headphone 43 includes a headphone band 43B, a left unit 43L, and a right unit 43R. The headphone band 43B connects the left unit 43L and the right unit 43R. The left unit 43L outputs sound to the left ear 9L of the subject 1. The right unit 43R outputs sound to the right ear 9R of the subject 1. The headphone 43 may be a closed type, an open type, a semi-open type, a semi-closed type, etc., regardless of the type of the headphone. With respect to the headphone 43, the microphone unit 2 is worn on the subject 1 while the headphone 43 is worn. That is, the left unit 43L and the right unit 43R of the headphone 43 are worn on the left ear 9L and the right ear 9R respectively wearing the left microphone 2L and the right microphone 2R. The headphone band 43B generates a force that presses the left unit 43L and the right unit 43R to the left ear 9L and the right ear 9R respectively.

[0080] The left microphone 2L picks up the sound output from the left unit 43L of the headset 43. The right microphone 2R picks up the sound output from the right unit 43R of the headset 43. The microphone parts of the left microphone 2L and the right microphone 2R are arranged at the sound pickup position near the external ear hole. The left microphone 2L and the right microphone 2R are configured so as not to interfere with the headset 43. That is, the subject 1 can wear the headset 43 in a state where the left microphone 2L and the right microphone 2R are arranged at appropriate positions of the left ear 9L and the right ear 9R. In addition, the left microphone 2L and the right microphone 2R may be built into the left unit 43L and the right unit 43R of the headset 43, respectively, or may be provided separately from the headset 43.

[0081] The measurement processing device 201 outputs a measurement signal to the left microphone 2L and the right microphone 2R. As a result, the left microphone 2L and the right microphone 2R generate pulse sounds and the like. Specifically, the left microphone 2L measures the pulse sound output from the left unit 43L. The right microphone 2R measures the pulse sound output from the right unit 43R. In this way, the impulse response measurement is performed.

[0082] The measurement processing device 201 stores the sound pickup signal measured based on the impulse response in a memory or the like. Thus, the transfer characteristic between the left unit 43L and the left microphone 2L (i.e., the external auditory canal transfer characteristic of the left ear) and the transfer characteristic between the right unit 43R and the right microphone 2R (i.e., the external auditory canal transfer characteristic of the right ear) are obtained. Here, the measurement data of the external auditory canal transfer characteristic of the left ear obtained by the left microphone 2L is taken as the measurement data ECTFL, and the measurement data of the external auditory canal transfer characteristic of the right ear obtained by the right microphone 2R is taken as the measurement data ECTFR.

[0083] The measurement processing device 201 has a memory for storing the measurement data ECTFL and ECTFR, etc. In addition, the measurement processing device 201 generates a pulse signal or a TSP (Time Stretched Pulse) signal as a measurement signal for measuring the external auditory canal transfer characteristic or the spatial acoustic transfer characteristic. The measurement signal includes a measurement sound such as a pulse sound.

[0084] pass Figure 2 , Figure 3 The measuring device 200 shown in FIG. 1 measures the external auditory canal transfer characteristics and the spatial acoustic transfer characteristics of a plurality of subjects 1. In this embodiment, the plurality of subjects 1 are subjected to the measurement based on the Figure 2 Similarly, a first preliminary measurement of the measurement structure is performed on a plurality of subjects 1 based on Figure 3 Thus, the external auditory canal transfer characteristics and the spatial acoustic transfer characteristics are measured for each subject 1.

[0085] (Outside head positioning filter determination system)

[0086] Next, use Figure 4 The outside-head positioning filter determination system 500 according to the present embodiment will be described. Figure 4 4 is a diagram showing the overall configuration of the out-of-head localization filter determination system 500. The out-of-head localization filter determination system 500 includes the microphone unit 2, the headphone 43, the out-of-head localization processing device 100, and the server device 300.

[0087] The head external positioning processing device 100 and the server device 300 are connected via a network 400. The network 400 is, for example, a public network such as the Internet or a mobile phone communication network. The head external positioning processing device 100 and the server device 300 can communicate wirelessly or by wire. In addition, the head external positioning processing device 100 and the server device 300 may also be an integrated device.

[0088] like Figure 1 As shown in FIG. 1 , the head positioning processing device 100 becomes a user terminal that outputs the reproduced signal after the head positioning processing to the user U. Furthermore, the head positioning processing device 100 measures the external auditory canal transfer characteristics of the user U. Therefore, the microphone unit 2 and the headphone 43 are connected to the head positioning processing device 100. Figure 3 Similarly to the measuring device 200, the impulse response measurement using the microphone unit 2 and the headphone 43 is performed. Alternatively, the microphone unit 2 and the headphone 43 may be wirelessly connected via Bluetooth (registered trademark) or the like.

[0089] The head external positioning processing device 100 includes an impulse response measuring unit 111, an ECTF characteristic acquiring unit 112, a transmitting unit 113, a receiving unit 114, an operation processing unit 120, an inverse filter calculating unit 121, a filter storage unit 122, and a switch 124. In addition, in the case where the head external positioning processing device 100 and the server device 300 are integrated as a device, the device may also include an acquiring unit that acquires user data instead of the receiving unit 114.

[0090] The switch 124 switches between user measurement and head-external positioning reproduction. That is, in the case of user measurement, the switch 124 connects the headphone 43 to the impulse response measurement unit 111. In the case of head-external positioning reproduction, the switch 124 connects the headphone 43 to the calculation processing unit 120.

[0091] The impulse response measuring unit 111 outputs a measurement signal of an impulse sound to the headphone 43 for user measurement. The microphone unit 2 picks up the impulse sound output by the headphone 43. The microphone unit 2 outputs the picked-up sound signal to the impulse response measuring unit 111. Figure 3 That is, the head positioning processing device 100 has the same Figure 3 The head positioning processing device 100, the microphone unit 2, and the headphone 43 constitute a measurement device for user measurement. The impulse response measurement unit 111 can also perform A / D conversion, synchronous addition processing, etc. on the picked-up sound signal.

[0092] By measuring the impulse response, the impulse response measuring unit 111 acquires measurement data ECTF related to the external auditory canal transfer characteristic. The measurement data ECTF includes measurement data ECTFL related to the external auditory canal transfer characteristic of the left ear 9L of the user U and measurement data ECTFR related to the external auditory canal transfer characteristic of the right ear 9R.

[0093] The ECTF characteristic acquisition unit 112 acquires the characteristics of the measurement data ECTFL and ECTFR by performing a predetermined process on the measurement data ECTFL and ECTFR. For example, the ECTF characteristic acquisition unit 112 calculates the frequency amplitude characteristic and the frequency phase characteristic by performing a discrete Fourier transform. In addition, the ECTF characteristic acquisition unit 112 is not limited to the discrete Fourier transform, and the frequency amplitude characteristic and the frequency phase characteristic may be calculated by transforming a discrete signal into the frequency domain such as a discrete cosine transform. The frequency power characteristic may also be used instead of the frequency amplitude characteristic.

[0094] use Figure 5 The external auditory canal transfer characteristics measured in the user measurement will be described. Figure 5 Schematic diagram showing the configuration of the driver of the headset 43 for user measurement. The left unit 43L and the right unit 43R of the headset 43 each have a housing 46. Two drivers 45f and 45m are provided on the housing 46. The housing 46 is a frame that holds the two drivers 45f and 45m. The left unit 43L and the right unit 43R are configured to be bilaterally symmetrical.

[0095] Drivers 45f and 45m have an actuator and a vibration plate, etc., and can output sound. The actuator is, for example, a voice coil motor or a piezoelectric element, etc., and converts an electrical signal into vibration. Drivers 45f and 45m can output sound independently.

[0096] Driver 45m and driver 45f are arranged at different positions. For example, driver 45m is arranged close to the external ear holes of left ear 9L and right ear 9R. Driver 45f is arranged at a position forward of driver 45m. The position where driver 45f is arranged is set as the first position, and the position where driver 45m is arranged is set as the second position. The first position is before the second position.

[0097] The driver 45m and the driver 45f can output the measurement signals at different timings. For the left ear 9L, the external auditory canal transfer characteristics M_ECTFL from the driver 45m of the left unit 43L to the left microphone 2L and the external auditory canal transfer characteristics F_ECTFL from the driver 45f of the left unit 43L to the left microphone 2L are measured. For the right ear 9R, the external auditory canal transfer characteristics M_ECTFR from the driver 45m of the right unit 43R to the right microphone 2R and the external auditory canal transfer characteristics F_ECTFL from the driver 45f of the right unit 43R to the right microphone 2R are measured.

[0098] The external auditory canal transfer characteristic F_ECTFL is a transfer characteristic from the first position of the left unit 43L to the microphone 2L. The external auditory canal transfer characteristic F_ECTFR is a transfer characteristic from the first position of the right unit 43R to the microphone 2R. The external auditory canal transfer characteristic M_ECTFL is a transfer characteristic from the second position of the left unit 43L to the microphone 2L. The external auditory canal transfer characteristic M_ECTFR is a transfer characteristic from the second position of the right unit 43R to the microphone 2R. The external auditory canal transfer characteristics F_ECTFL, F_ECTFR are referred to as first external auditory canal transfer characteristics or their measured data. The external auditory canal transfer characteristics M_ECTFL, M_ECTFR are referred to as second external auditory canal transfer characteristics or their measured data. The first external auditory canal transfer characteristic and the second external auditory canal transfer characteristic are measured by using the microphone unit 2 and the impulse response measurement of the headphone 43.

[0099] Preferably, the driver 45f is configured with Figure 2 The configuration of the stereo speaker 5 corresponds to the position. For example, Figure 5 As shown, the front of the person being measured 1 is assumed to be 0°, and the left speaker 5L is set in the direction of the opening angle θ. In this case, it is preferred that the direction from the microphone 2L toward the driver 45f is parallel to the direction of the opening angle θ. That is, when viewed from above, it is preferred that the direction from the center O of the head of the person being measured 1 toward the speaker 5L is parallel to the direction from the microphone 2L toward the driver 45f. In addition, when the stereo speaker 5 is arranged in front of the person being measured 1, the opening angle θ is preferably in the range of 0 to 90°, preferably set to 30°. The right speaker 5R and the driver 45f of the right unit 43R are configured in the same manner.

[0100] The driver 45m is arranged on the side of the external auditory canal. The driver 45m is preferably arranged at the same position and of the same type as the driver of the headphone 43 that performs the external positioning reproduction.

[0101] The sending unit 113 sends the user data related to the external auditory canal transfer characteristics to the server device 300. The user data is data based on the first external auditory canal transfer characteristics F_ECTFL and F_ECTFR. In addition, the user data may be data in the time domain or data in the frequency domain. The user data may be the whole or a part of the frequency amplitude characteristics. Alternatively, the user data may be a feature quantity extracted from the frequency amplitude characteristics.

[0102] The inverse filter calculation unit 121 calculates the inverse filter based on the second external auditory canal transfer characteristics M_ECTFL and M_ECTFR. For example, the inverse filter calculation unit 121 corrects the frequency amplitude characteristics and the frequency phase characteristics of the second external auditory canal transfer characteristics M_ECTFL and M_ECTFR. The inverse filter calculation unit 121 calculates the time signal using the frequency characteristics and the phase characteristics through inverse discrete Fourier transform. The inverse filter calculation unit 121 cuts out the time signal with a specified filter length, thereby calculating the inverse filter.

[0103] As described above, the inverse filter is a filter that eliminates the headphone characteristics (characteristics between the reproduction unit of the headphone and the microphone). The filter storage unit 122 stores the left and right inverse filters calculated by the inverse filter calculation unit 121. In addition, a known method can be used for the calculation method of the inverse filter, so a detailed description is omitted.

[0104] Next, use Figure 6 The configuration of the server device 300 will be described. Figure 6 300 is a block diagram showing a control structure of the server device 300. The server device 300 includes a receiving unit 301, a comparing unit 302, a data storage unit 303, an extracting unit 304, and a sending unit 305. The server device 300 is a filter determination device that determines a spatial acoustic filter based on the external auditory canal transfer characteristic. In addition, when the head external positioning processing device 100 and the server device 300 are an integrated device, the device may not include the sending unit 305.

[0105] In addition, the server device 300 is a computer including a processor, a memory, etc., and performs the following processing by a program. In addition, the server device 300 is not limited to a single device, and can also be implemented by a combination of two or more devices, or can be a virtual server such as a cloud server. The data storage unit that stores data, the comparison unit 302 that performs data processing, and the extraction unit 304 can also be physically different devices.

[0106] The receiving unit 301 receives user data transmitted from the head external positioning processing device 100. The receiving unit 301 processes the received user data in accordance with the communication standard (e.g., demodulation processing). The comparing unit 302 compares the user data with the preset data stored in the data storage unit 303. Here, the receiving unit 301 receives the first external auditory canal transfer characteristics F_ECTFL and F_ECTFR measured by the user measurement as user data. The user data of the first external auditory canal transfer characteristics F_ECTFL and F_ECTFR are set as user data F_ECTFL_U and F_ECTFR_U.

[0107] The data storage unit 303 is a database that stores data related to a plurality of subjects measured in advance as preset data. Figure 7 , the data stored in the data storage unit 303 is explained. Figure 7 It is a table showing the data stored in the data storage unit 303 .

[0108] The data storage unit 303 stores preset data for each of the left and right ears of the subject. Specifically, the data storage unit 303 forms the following table format: the subject ID, the left and right ears, the first external auditory canal transfer characteristic, the spatial acoustic transfer characteristic 1, and the spatial acoustic transfer characteristic 2 are arranged in one row. In addition, Figure 7 The data format shown is an example, and instead of a table format, a data format in which objects of each parameter are associated and held using tags or the like may be used.

[0109] The data storage unit 303 stores two data sets for one subject A. That is, the data storage unit 303 stores a data set related to the left ear of the subject A and a data set related to the right ear of the subject A.

[0110] One data set includes a subject ID, left and right ears, a first external auditory canal transfer characteristic, a spatial acoustic transfer characteristic 1, and a spatial acoustic transfer characteristic 2. The first external auditory canal transfer characteristic is based on Figure 3 The second pre-measured data of the measuring device 200 shown in FIG.

[0111] The first external auditory canal transfer characteristic of the left ear of subject A is expressed as the first external auditory canal transfer characteristic F_ECTFL_A, and the first external auditory canal transfer characteristic of the right ear of subject A is expressed as the first external auditory canal transfer characteristic F_ECTFR_A. The first external auditory canal transfer characteristic of the left ear of subject B is expressed as the first external auditory canal transfer characteristic F_ECTFL_B, and the first external auditory canal transfer characteristic of the right ear of subject B is expressed as the first external auditory canal transfer characteristic F_ECTFR_B. Figure 5 As shown, the first external auditory canal transfer characteristic is data measured using a driver 45f disposed in front of the external auditory canal. The headphone 43 and the driver 45f used in the user measurement and the second preliminary measurement are preferably of the same type, but may be of different types.

[0112] Spatial acoustic transfer characteristics 1 and spatial acoustic transfer characteristics 2 are based on Figure 2 The first pre-measured data of the measuring device 200 shown. In the case of the left ear of the measured person A, the spatial acoustic transfer characteristic 1 becomes Hls_A, and the spatial acoustic transfer characteristic 2 becomes Hro_A. In the case of the right ear of the measured person A, the spatial acoustic transfer characteristic 1 becomes Hrs_A, and the spatial acoustic transfer characteristic 2 becomes Hlo_A. In this way, the two spatial acoustic transfer characteristics related to one ear are paired. Regarding the left ear of the measured person B, Hls_B is paired with Hro_B, and regarding the right ear of the measured person B, Hrs_B is paired with Hlo_B. The spatial acoustic transfer characteristic 1 and the spatial acoustic transfer characteristic 2 can be data after cutting out with the filter length, or can be data before cutting out with the filter length.

[0113] Regarding the left ear of the measured person A, the first external auditory canal transfer characteristic F_ECTFL_A, the spatial acoustic transfer characteristic Hls_A, and the spatial acoustic transfer characteristic Hro_A are associated to form one data set. Similarly, regarding the right ear of the measured person A, the first external auditory canal transfer characteristic F_ECTFR_A, the spatial acoustic transfer characteristic Hrs_A, and the spatial acoustic transfer characteristic Hlo_A are associated to form one data set. Similarly, regarding the left ear of the measured person B, the first external auditory canal transfer characteristic F_ECTFL_B, the spatial acoustic transfer characteristic Hls_B, and the spatial acoustic transfer characteristic Hro_B are associated to form one data set. Similarly, regarding the right ear of the measured person B, the first external auditory canal transfer characteristic F_ECTFL_B, the spatial acoustic transfer characteristic Hrs_B, and the spatial acoustic transfer characteristic Hlo_B are associated to form one data set.

[0114] In addition, the pair of spatial acoustic transfer characteristics 1 and 2 is set as the first preset data. That is, the spatial acoustic transfer characteristics 1 and the spatial acoustic transfer characteristics 2 constituting one data set are set as the first preset data. The first external auditory canal transfer characteristics constituting one data set are set as the second preset data. One data set includes the first preset data and the second preset data. Furthermore, the data storage unit 303 stores the first preset data and the second preset data in association with each of the left and right ears of the subject.

[0115] Here, it is assumed that the first and second preliminary measurements are performed in advance on n (n is an integer greater than or equal to 2) persons to be measured 1. In this case, 2n data sets as binaural components are stored in the data storage unit 303. The first external auditory canal transfer characteristics stored in the data storage unit 303 are represented as first external auditory canal transfer characteristics F_ECTFL_A to first external auditory canal transfer characteristics F_ECTFL_N and first external auditory canal transfer characteristics F_ECTFR_A to first external auditory canal transfer characteristics F_ECTFR_N.

[0116] The comparison unit 302 compares the user data F_ECTFL_U with each of the first external auditory canal transfer characteristics F_ECTFL_A to F_ECTFL_N and F_ECTFR_A to F_ECTFR_N. Furthermore, the comparison unit 302 selects one of the 2n first external auditory canal transfer characteristics F_ECTFL_A to F_ECTFL_N and F_ECTFR_A to F_ECTFR_N that is most similar to the user data F_ECTFL_U. Here, the correlation between the two frequency amplitude characteristics is calculated as a similarity score. The comparison unit 302 selects a data set of the first external auditory canal transfer characteristics that has the highest similarity score with the user data. Here, assuming that the left ear of the measured person l is selected, the selected first external auditory canal transfer characteristic is used as the left selected characteristic F_ECTFL_l.

[0117] Similarly, the comparison unit 302 compares the user data F_ECTFR_U with each of the first external auditory canal transfer characteristics F_ECTFL_A to F_ECTFL_N and F_ECTFR_A to F_ECTFR_N. And, the comparison unit 302 selects one of the 2n first external auditory canal transfer characteristics F_ECTFL_A to F_ECTFL_N and F_ECTFR_A to F_ECTFR_N that is most similar to the user data F_ECTFR_U. Here, assuming that the right ear of the measured person m is selected, the selected first external auditory canal transfer characteristic is referred to as the right selected characteristic F_ECTFR_m.

[0118] The comparison unit 302 outputs the comparison result to the extraction unit 304. Specifically, the subject ID and the left and right ears of the second preset data having the highest similarity score are output to the extraction unit 304. The extraction unit 304 extracts the first preset data based on the comparison result.

[0119] The extraction unit 304 reads the spatial acoustic transfer characteristic corresponding to the left selection characteristic F_ECTFL_1 from the data storage unit 303. The extraction unit 304 refers to the data storage unit 303 to extract the spatial acoustic transfer characteristic Hls_1 and the spatial acoustic transfer characteristic Hro_1 of the left ear of the measurement subject 1.

[0120] Similarly, the extraction unit 304 reads the spatial acoustic transfer characteristic corresponding to the right selection characteristic F_ECTFR_m from the data storage unit 303. The extraction unit 304 refers to the data storage unit 303 to extract the spatial acoustic transfer characteristic Hrs_m and the spatial acoustic transfer characteristic Hlo_m of the left ear of the measurement subject m.

[0121] In this way, the comparison part 302 compares the user data with the plurality of second preset data. Then, the extraction part 304 extracts the first preset data suitable for the user based on the comparison result between the second preset data and the user data.

[0122] Then, the sending unit 305 sends the first preset data extracted by the extraction unit 304 to the head-outside positioning processing device 100. The sending unit 305 processes the first preset data corresponding to the communication standard (for example, modulation processing) and sends it. Here, for the left ear, the spatial acoustic transfer characteristics Hls_1 and the spatial acoustic transfer characteristics Hro_1 are extracted as the first preset data, and for the right ear, the spatial acoustic transfer characteristics Hrs_m and the spatial acoustic transfer characteristics Hlo_m are extracted as the first preset data. Therefore, the sending unit 305 sends the spatial acoustic transfer characteristics Hls_1, the spatial acoustic transfer characteristics Hro_1, the spatial acoustic transfer characteristics Hrs_m, and the spatial acoustic transfer characteristics Hlo_m to the head-outside positioning processing device 100.

[0123] return Figure 4 The receiving unit 114 receives the first preset data transmitted from the transmitting unit 305. The receiving unit 114 performs processing (e.g., demodulation processing) corresponding to the communication standard on the received first preset data. The receiving unit 114 receives the spatial acoustic transfer characteristics Hls_1 and the spatial acoustic transfer characteristics Hro_1 as the first preset data about the left ear, and receives the spatial acoustic transfer characteristics Hrs_m and the spatial acoustic transfer characteristics Hlo_m as the first preset data about the right ear.

[0124] Then, the filter storage unit 122 stores the spatial acoustic filter based on the first preset data. That is, the spatial acoustic transfer characteristic Hls_1 becomes the spatial acoustic transfer characteristic Hls of the user U, and the spatial acoustic transfer characteristic Hro_1 becomes the spatial acoustic transfer characteristic Hro of the user U. Similarly, the spatial acoustic transfer characteristic Hrs_m becomes the spatial acoustic transfer characteristic Hrs of the user U, and the spatial acoustic transfer characteristic Hlo_m becomes the spatial acoustic transfer characteristic Hlo of the user U.

[0125] In addition, when the first preset data is data after being cut out with the filter length, the head-outside positioning processing device 100 directly stores the first preset data as a spatial acoustic filter. For example, the spatial acoustic transfer characteristic Hls_1 becomes the spatial acoustic transfer characteristic Hls of the user U. When the first preset data is data before being cut out with the filter length, the head-outside positioning processing device 100 performs processing to cut out the spatial acoustic transfer characteristic into the filter length.

[0126] The calculation processing unit 120 performs calculation processing using a spatial acoustic filter and an inverse filter corresponding to the four spatial acoustic transfer characteristics Hls, Hlo, Hro, and Hrs. Figure 1 The above-shown external head localization processing unit 10, filter unit 41, and filter unit 42 are configured. Therefore, the operation processing unit 120 uses four spatial acoustic filters and two inverse filters to perform the above-mentioned convolution operation processing and the like on the stereo input signal.

[0127] In this way, the data storage unit 303 stores the first preset data and the second preset data in association with each subject 1. The first preset data is data on the spatial acoustic transfer characteristics of the subject 1. The second preset data is data on the first external auditory canal transfer characteristics of the subject 1.

[0128] The comparison unit 302 compares the user data with the second preset data. The user data is data related to the first external auditory canal transfer characteristic obtained in the user measurement. The comparison unit 302 determines the subject 1 and the left and right ears that are similar to the first external auditory canal transfer characteristic of the user.

[0129] The extraction unit 304 reads the first preset data corresponding to the determined subject and the left and right ears. Then, the transmission unit 305 transmits the extracted first preset data to the head-outside positioning processing device 100. The head-outside positioning processing device 100 as a user terminal performs head-outside positioning processing using a spatial acoustic filter based on the first preset data and an inverse filter based on the measurement data.

[0130] Thus, even if the user U does not measure the spatial acoustic transfer characteristics, an appropriate filter can be determined. Therefore, the user does not need to go to a listening room, or does not need to set up speakers, etc. in the user's home. The user measurement is implemented in the earphone wearing state. That is, if the user U wears headphones and a microphone, the user's personal external auditory canal transfer characteristics can be measured. Therefore, it is possible to achieve out-of-head positioning with a high positioning effect in a simple way. In addition, the user measurement and the headphones 43 used for out-of-head positioning listening are preferably of the same type.

[0131] In addition, in the present embodiment, two drivers 45m and 45f are used. In the generation of the inverse filter, the second external auditory canal transfer characteristic measured by the driver 45m is used. In addition, in the determination of the spatial acoustic filter, the first external auditory canal transfer characteristic measured by the driver 45f is used. That is, the spatial acoustic filter is determined by matching the user data related to the first external auditory canal transfer characteristic with the second preset data. As a result, a more appropriate head external positioning filter can be used.

[0132] In the generation of the spatial acoustic filter, that is, in the measurement of the spatial acoustic transfer characteristics, a stereo speaker 5 arranged in front of the person being measured 1 is used. The microphone unit 2 picks up the measurement signal arriving from the oblique front, thereby measuring the spatial acoustic transfer characteristics. In the measurement of the first external auditory canal transfer characteristics, a driver 45f arranged in a position forward of the external auditory hole is used. According to this embodiment, the measurement signal for measuring the first external auditory canal transfer characteristics and the measurement signal for measuring the spatial acoustic transfer characteristics can have the same incident angle.

[0133] The direction from the microphone to the first position is along the direction from the subject to the speaker. Therefore, it is easy to infer the relationship between the spatial acoustic transfer characteristics and the external auditory canal transfer characteristics, thereby improving the matching accuracy. A more appropriate spatial acoustic filter can be used to perform head positioning processing.

[0134] On the other hand, in the generation of the inverse filter, the second external auditory canal transfer characteristic measured by the driver 45m is used. When performing the head positioning process, in the headphone 43, the driver is usually next to the external auditory canal. Therefore, a more appropriate inverse filter can be used for the head positioning process.

[0135] In addition, the headset 43 measured by the user and the headset 43 measured in the second pre-measurement are preferably of the same type, but may be of different types. That is, the driver 45f measured by the user and the driver 45f measured in the second pre-measurement may be of different types and may be arranged at different positions. The incident angles of the measurement signals in the first pre-measurement, the second pre-measurement, and the user measurement are preferably the same, but may be different.

[0136] In addition, different headphones 43 may be used in the measurement of the first external auditory canal transfer characteristic and the second external auditory canal transfer characteristic. For example, in the measurement of the first external auditory canal transfer characteristic, a headphone 43 having only the driver 45f is used, and in the measurement of the second external auditory canal transfer characteristic, a headphone 43 having only the driver 45m may be used. By preparing two types of headphones 43, it is possible to perform user measurement using a headphone 43 having one driver each on the left and right.

[0137] In addition, in the method of this embodiment, there is no need to conduct an auditory test of listening to multiple preset characteristics, and there is no need to measure body characteristics in detail. Therefore, the burden on the user can be reduced and the convenience can be improved. In addition, by comparing the data of the measured person and the user, a measured person with similar characteristics can be selected. In addition, the extraction unit 304 extracts the first preset data of the ear of the selected measured person, so a higher head positioning effect can be expected.

[0138] Thus, even without performing user measurement of spatial acoustic transfer characteristics, an appropriate filter can be determined. Therefore, convenience can be improved. In addition, the extraction unit 304 can also extract more than two first preset data. The user can also determine the best head-outside positioning filter based on the result of the auditory test. In this case, the number of auditory tests can also be reduced, thereby reducing the burden on the user.

[0139] Modification 1

[0140] In the first variant, the first and second external auditory canal transfer characteristics are used in the matching of the external auditory canal transfer characteristics between the user data and the second preset data. Therefore, the sending unit 113 sends not only the first external auditory canal transfer characteristics F_ECTFL and F_ECTFR, but also the second external auditory canal transfer characteristics M_ECTFL and M_ECTFR as user data. The head external positioning processing device 100 sends the user data related to the first and second external auditory canal transfer characteristics to the server device 300. Figure 8 The preset data stored in the server device 300 will be described.

[0141] Figure 8 : is a table showing preset data in variant example 1. The second preset data includes the first and second external auditory canal transfer characteristics. The second preset data includes the first and second external auditory canal transfer characteristics. With respect to the left ear of the measured person A, the first external auditory canal transfer characteristic F_ECTFL_A, the second external auditory canal transfer characteristic M_ECTFL_A, the spatial acoustic transfer characteristic Hls_A, and the spatial acoustic transfer characteristic Hro_A are associated with each other to form one data set. Similarly, with respect to the right ear of the measured person A, the first external auditory canal transfer characteristic F_ECTFR_A, the second external auditory canal transfer characteristic M_ECTFR_A, the spatial acoustic transfer characteristic Hrs_A, and the spatial acoustic transfer characteristic Hlo_A are associated with each other to form one data set.

[0142] In this embodiment, the first and second external auditory canal transfer characteristics become the second preset data. The comparison unit 302 of the server device 300 respectively obtains the correlation between the user data and the preset data for the first and second external auditory canal transfer characteristics. That is, the comparison unit 302 obtains the first correlation between the user data and the preset data for the first external auditory canal transfer characteristic. Similarly, the comparison unit 302 obtains the second correlation between the user data and the preset data for each second external auditory canal transfer characteristic.

[0143] The comparison unit 302 calculates a similarity score based on the two correlations. The similarity score may be, for example, a simple average or a weighted average of the first and second correlations. The extraction unit 304 extracts the first preset data of the data set having the highest similarity score. By matching using two or more external auditory canal transfer characteristics, preset data suitable for the user can be extracted. The head external positioning filter can be determined with higher accuracy.

[0144] Implementation Method 2

[0145] use Fig. 9 The headphone 43 used in this embodiment will be described. In the embodiment, the position of the driver 45 is variable in the headphone 43. The overall basic structure of the external head localization filter determination system 500 is the same as that of the first embodiment, and therefore the description thereof will be omitted.

[0146] The relative position of the driver 45 with respect to the left microphone 2L and the right microphone 2R can be changed. For example, the position of the driver 45 can be adjusted in the housing 46. The incident angle of the measurement signal to the microphone can be set to an arbitrary angle. Then, the measurement is performed when the driver 45 is located at the first position, the second position, and the third position. Fig. 9 In FIG. 1 , the driver 45 at the first position is indicated by a solid line, and the driver 45 at the second position and the third position is indicated by a dotted line as drivers 45m and 45b.

[0147] The first position and the second position are the same positions as those in Embodiment 1. As in Embodiment 1, the external auditory canal transfer characteristics measured at the first position are set as first external auditory canal transfer characteristics F_ECTFL and F_ECTFR, and the external auditory canal transfer characteristics measured at the second position are set as second external auditory canal transfer characteristics M_ECTFL and M_ECTFR. The third position is located behind the second position. The third position is located behind the external auditory canal. The external auditory canal transfer characteristics obtained by measuring the third position are set as third external auditory canal transfer characteristics B_ECTFL and B_ECTFR.

[0148] In the present embodiment, all measurement data of the first external auditory canal transfer characteristics F_ECTFL, F_ECTFR, the second external auditory canal transfer characteristics M_ECTFL, M_ECTFR, and the third external auditory canal transfer characteristics B_ECTFL, B_ECTFR are transmitted to the server device 300 as user data.

[0149] In this embodiment, the head positioning processing is performed using the 5.1ch reproduction signal. In the case of 5.1ch, there are 6 speakers. That is, the measurement environment of the measurement device 200 is equipped with a center speaker (front speaker), a right front speaker, a left front speaker, a right rear speaker, a left rear speaker, and a bass subwoofer. Figure 2 The measurement device 200 shown in the figure has a center speaker, a left rear speaker, a right rear speaker, and a subwoofer added thereto. The center speaker is arranged in front of the person being measured 1. For example, the center speaker is arranged between the left front speaker and the right front speaker.

[0150] The spatial acoustic transfer characteristics from the left front speaker to the left and right ears are set to Hls and Hlo in the same manner as in Embodiment 1. The spatial acoustic transfer characteristics from the right front speaker to the left and right ears are set to Hro and Hrs in the same manner as in Embodiment 1. The spatial acoustic transfer characteristics from the center speaker to the left and right ears are set to CHl and CHr. The spatial acoustic transfer characteristics from the left rear speaker to the left and right ears are set to SHls and SHlo. The spatial acoustic transfer characteristics from the right rear speaker to the left and right ears are set to SHro and SHrs. The spatial acoustic transfer characteristics from the subwoofer for bass output to the left and right ears are set to SWHl and SWHr.

[0151] The server device 300 performs matching to obtain spatial acoustic transfer characteristics for each speaker. The external auditory canal transfer characteristics used for matching are changed according to the speaker. For example, similarly to the first embodiment, the first external auditory canal transfer characteristics are used for matching in the left front speaker and the right front speaker. In this case, the preset data and the Figure 7 Same. Or, Figure 8 As shown, the first and the second external auditory canal transfer characteristics can also be used for matching.

[0152] In the left rear speaker and the right rear speaker, the third external auditory canal transfer characteristic from the third position to the microphone is used for matching. The third position is Fig. 9 The position shown by the driver 45b is a position behind the external auditory canal. It is preferred to make the incident angle of the measurement signal from the driver 45b consistent with the setting direction of the left rear speaker and the right rear speaker. The following describes the process of obtaining the spatial acoustic transfer characteristics SHls, SHro or the spatial acoustic transfer characteristics SHlo, SHrs.

[0153] Fig.10 This is a table showing preset data for obtaining spatial acoustic transfer characteristics SHls, SHro or spatial acoustic transfer characteristics SHlo, SHrs. For the left ear of the measured person A, the second external auditory canal transfer characteristic M_ECTFL_A, the third external auditory canal transfer characteristic B_ECTFL_A, the spatial acoustic transfer characteristic SHls_A, and the spatial acoustic transfer characteristic SHro_A are associated to form one data set. Similarly, for the right ear of the measured person A, the second external auditory canal transfer characteristic M_ECTFR_A, the third external auditory canal transfer characteristic B_ECTFR_A, the spatial acoustic transfer characteristic SHrs_A, and the spatial acoustic transfer characteristic SHlo_A are associated to form one data set.

[0154] Furthermore, the comparison unit 302 obtains the correlation between the second preset data and the user data for the second and third external auditory canal transfer characteristics. The extraction unit 304 extracts the first preset data related to the spatial acoustic transfer characteristics SHls, SHlo or the spatial acoustic transfer characteristics SHro, SHrs according to the similarity score corresponding to the correlation. The correlation between the user data related to the second external auditory canal transfer characteristic and the preset data is set as the second correlation, and the correlation between the user data related to the third external auditory canal transfer characteristic and the preset data is set as the third correlation.

[0155] The comparison unit 302 calculates a similarity score based on the two correlations. The similarity score may be, for example, a simple average or a weighted average of the second and third correlations. The extraction unit 304 extracts the first preset data of the data set having the highest similarity score. By matching using two or more external auditory canal transfer characteristics, preset data suitable for the user can be extracted. The head external positioning filter can be determined with higher accuracy.

[0156] In this way, the second preset data associated with the first preset data is changed according to the relative position of the speaker with respect to the measured person 1. That is, for the left front speaker and the right front speaker located in front of the user, the first external auditory canal transfer characteristic measured by the driver 45 disposed at a position in front of the external auditory hole is used for matching. For the left rear speaker and the right rear speaker located behind the user, the third external auditory canal transfer characteristic measured by the driver 45b disposed at a position in the rear of the external auditory hole is used for matching.

[0157] The spatial acoustic transfer characteristics CHl, CHr from the center speaker to the left and right ears are also matched using one or more external auditory canal transfer characteristics. The spatial acoustic transfer characteristics SWHl, SWHr from the subwoofer for bass output to the left and right ears are also matched using one or more external auditory canal transfer characteristics. Since the subwoofer and the center speaker are arranged in front of the subject 1, it is preferred to perform the measurement with the driver 45 arranged in a position forward of the external auditory hole. In addition, since the directivity of the frequency band of the subwoofer is low, the external auditory canal transfer characteristics measured at any driver position can be used for matching regardless of the positional relationship between the subject 1 and the subwoofer.

[0158] For the speaker in front of the person to be measured 1, the external auditory canal transfer characteristic from the first position to the microphone is used for matching. For the speaker in the back of the person to be measured 1, the external auditory canal transfer characteristic from the third position to the microphone is used for matching. In this way, the incident angle of the measurement signal can be made consistent, so a more appropriate head positioning filter can be set. The incident angle of the measurement signal from the driver and the incident angle of the measurement signal from the speaker may not be completely consistent.

[0159] Of course, it is not limited to 5.1ch, and 7.1ch or 9.1ch speakers can also be used. In this case, the spatial acoustic filter from each speaker to the left and right ears can be obtained by matching the external auditory canal transfer characteristics. Moreover, the weight of the weighted addition can be adjusted by the configuration of the speakers.

[0160] In addition, when more than three external auditory canal transfer characteristics are measured, more than three external auditory canal transfer characteristics may be used in matching. In this case, the correlations may be weighted and added with weights corresponding to the positions of the speakers. The three external auditory canal transfer characteristics are used for matching, and their preset data is shown in FIG. Fig.11 .

[0161] exist Fig.11 In the embodiment, the second preset data includes the first to third external auditory canal transfer characteristics. With respect to the left ear of the measured person A, the first external auditory canal transfer characteristic F_ECTFL_A, the second external auditory canal transfer characteristic M_ECTFL_A, the third external auditory canal transfer characteristic B_ECTFL_A, the spatial acoustic transfer characteristic Hls_A, and the spatial acoustic transfer characteristic Hro_A are associated with each other to form one data set. Similarly, with respect to the right ear of the measured person A, the first external auditory canal transfer characteristic F_ECTFR_A, the second external auditory canal transfer characteristic M_ECTFR_A, the third external auditory canal transfer characteristic B_ECTFR_A, the spatial acoustic transfer characteristic Hrs_A, and the spatial acoustic transfer characteristic Hlo_A are associated with each other to form one data set.

[0162] The first to third external auditory canal transfer characteristics become the second preset data. The comparison unit 302 of the server device 300 respectively obtains the correlation between the user data and the preset data for the first to third external auditory canal transfer characteristics. That is, the comparison unit 302 obtains the correlation between the user data and the preset data for the first external auditory canal transfer characteristic. Similarly, the comparison unit 302 obtains the correlation between the user data and the preset data for each of the second and third external auditory canal transfer characteristics.

[0163] The comparison unit 302 calculates a similarity score based on the three correlations. The similarity score may be, for example, a simple average or a weighted average of the first to third correlations. The extraction unit 304 extracts the first preset data of the data set having the highest similarity score. By using more than three external auditory canal transfer characteristics for matching, preset data suitable for the user can be extracted. The head positioning filter can be determined with higher accuracy. In addition, for external auditory canal transfer characteristics that are not used for matching, the weight of the weighted addition may also be set to 0.

[0164] In the above description, the position of the driver 45 is made variable in the housing 46, but a housing having three drivers 45 may be used. Alternatively, a mechanism may be provided that can adjust the position and angle of the housing 46. That is, by adjusting the angle of the housing 46 relative to the headphone band 43B, the relative position of the driver 45 relative to the microphones 2L and 2R may be changed.

[0165] Implementation 3

[0166] In this embodiment, shape data corresponding to the shape of the head of the user and the person being measured is used. Specifically, a sensor for acquiring shape data corresponding to the shape of the head is provided in the headset 43. A specific example of the sensor provided in the headset 43 is described below.

[0167] (Sensor Example 1)

[0168] Fig.12 1 is a front view schematically showing a headset 43 having an opening sensor 141. The opening sensor 141 is provided on the headset band 43B. The opening sensor 141 detects the amount of deformation of the headset band 43B, that is, the opening of the headset 43. As the opening sensor 141, an angle sensor that detects the opening angle of the headset band 43B can be used. Alternatively, a gyro sensor or a piezoelectric sensor can be used as the opening sensor 141. The width W of the head is detected by the opening sensor 141.

[0169] Fig.131 is a front view schematically showing subjects 1 with different head widths. In subjects 1 with narrow width W1, the opening degree becomes smaller, and in subjects 1 with wide width W2, the opening degree becomes larger. Therefore, the opening degree detected by the opening degree sensor 141 corresponds to the width W of the head. That is, the opening degree sensor 141 acquires the width of the head as shape data by detecting the opening angle of the headset 43.

[0170] (Sensor Example 2)

[0171] Fig.14 1 is a front view schematically showing a headphone 43 having a slide position sensor 142. A slide mechanism 146 is provided between the headphone band 43B and the left unit 43L. A slide mechanism 146 is provided between the headphone band 43B and the right unit 43R. Fig.14 As shown by the solid arrows in FIG. 1 , the sliding mechanism 146 makes the left unit 43L and the right unit 43R slide up and down relative to the headphone band 43B. As a result, the height H from the top of the head of the person being measured 1 to the left unit 43L and the right unit 43R can be changed. The sliding position sensor 142 detects the sliding position (sliding length) of the sliding mechanism 146. The sliding position sensor 142 is, for example, a rotation sensor, and detects the sliding position based on the rotation angle.

[0172] The sliding position of the sliding mechanism 146 varies according to the length of the head. Fig.15 Here, the height from the top of the head to the external auditory canal is represented as H1, H2. The sliding position changes according to the height H1, H2 from the top of the head to the external auditory canal. Therefore, by detecting the sliding position of the sliding mechanism 146 by the sliding position sensor 142, the length of the head can be detected as shape data.

[0173] (Sensor Example 3)

[0174] Fig.16 1 is a top view schematically showing a headset 43 having a rotation angle sensor 143. The rotation angle sensor 143 is provided between the headset band 43B and the left unit 43L. The rotation angle sensor 143 is provided between the headset band 43B and the right unit 43R. The rotation angle sensor 143 detects the rotation angles of the left unit 43L and the right unit 43R of the headset 43, respectively. The rotation angle is the angle of the left unit 43L or the right unit 43R around the vertical axis relative to the headset band 43B ( Fig.16 direction of the arrow).

[0175] Fig.171 is a top view schematically showing states of different rotation angles. For example, in the case of the measured person 1 whose ears are located further back than the center of the head, the left unit 43L or the right unit 43R is in a state of being opened forward ( Fig.17 Alternatively, in the case of the subject 1 whose front head is wide and whose back head is narrow, the left unit 43L or the right unit 43R is in a state of opening forward. In the case of the subject 1 whose ears are located further forward than the center of the head, the left unit 43L or the right unit 43R is in a state of opening backward ( Fig.17 In the case of the person being measured 1 whose front head is narrow and whose back head is wide, the left unit 43L or the right unit 43R is in a state of being opened forward.

[0176] (Sensor Example 4)

[0177] Fig.18 1 is a front view schematically showing a headset 43 having a suspension angle sensor 144. The suspension angle sensor 144 is provided between the headset band 43B and the left unit 43L. The suspension angle sensor 144 is provided between the headset band 43B and the right unit 43R. The suspension angle sensor 144 detects the suspension angles of the left unit 43L and the right unit 43R of the headset 43, respectively. The suspension angle is an angle ( Fig.18 direction of the arrow).

[0178] Fig.19 4 is a top view schematically showing states of different hanging angles. For example, in the case of the measured person 1 whose ears are located upward, the left unit 43L or the right unit 43R is in a state of being opened downward ( Fig.19 In the case of the measured person 1 with a narrow face width, the left unit 43L or the right unit 43R is opened upward. In the case where the ear is located at the bottom, the left unit 43L or the right unit 43R is opened upward ( Fig.19 In addition, in the case of the measurement subject 1 having a wide face width, the left unit 43L or the right unit 43R is in a state of being opened downward.

[0179] By using at least one of the opening sensor 141, the slide position sensor 142, the rotation angle sensor 143, and the suspension angle sensor 144, shape data corresponding to the head shape of the person being measured 1 can be detected. The shape data may also be expressed as a relative position or relative angle between the left unit 43L and the right unit 43R. The shape data may also be data showing the dimensions of the actual head shape.

[0180] Of course, the above sensor is an example, and other sensors may be provided on the headset 43 to detect shape data. The shape data detected for one ear may be one or more types, but two or more types may be combined. When two or more types of shape data are detected for one ear, the shape data may be multi-dimensional vector data.

[0181] The various sensors detect shape data for each ear of the measured person 1. In addition, the various sensors also detect shape data for the user. The data storage unit 303 of the server device 300 stores the shape data. Fig. 20 As shown, the shape data is associated with the first and second presets.

[0182] The comparison unit 302 uses the shape data for matching. For example, when the difference in shape data between the user and the person being measured is greater than a threshold, the data set may be excluded from the matching. Alternatively, a similarity score may be calculated based on the comparison result of the shape data. In this embodiment, the server device 300 extracts the first preset data based on the shape data. Thus, a more appropriate head positioning filter can be determined.

[0183] Implementation 4

[0184] As shown in Embodiment 1, in the first preliminary measurement, the second preliminary measurement, and the user measurement, it is preferable to make the incident angle of the measurement signal consistent. On the other hand, the wearing state of the headset 43 varies depending on the head shape of the person being measured 1, etc. For example, the wearing angle of the housing 46 varies depending on the head shape of the person being measured 1. Therefore, in Embodiment 4 and its variation 2, the headset 43 capable of adjusting the incident angle of the measurement signal is described. Embodiment 4 and its variation 2 only need to be used for at least one of the second preliminary measurement and the user measurement.

[0185] Fig.21 1 is a plan view schematically showing the structure of the headphone 43 . Fig. 22 4 is a diagram showing a structure in which the driver 45 is located at the first to third positions. Fig. 22 In the figure, the driver 45 located at the first position is represented as driver 45f, the driver 45 located at the second position is represented as driver 45m, and the driver 45 located at the third position is represented as driver 45b.

[0186] The headset 43 has a rotation angle sensor 143. The rotation angle sensor 143 detects the rotation angle of the housing 46 as described above. The left unit 43L has a driver 45, a housing 46, a guide mechanism 47, and a drive motor 48. The right unit 43R has a driver 45, a housing 46, a guide mechanism 47, and a drive motor 48. The left unit 43L and the right unit 43R have a bilaterally symmetrical structure, so the description of the right unit 43R is appropriately omitted.

[0187] A driver 45, a guide mechanism 47, and a drive motor 48 are provided in the housing 46. The drive motor 48 is an actuator such as a stepping motor or a servo motor, and moves the driver 45. The guide mechanism 47 is fixed in the housing 46. The guide mechanism 47 is a guide rail formed in an arc shape when viewed from above. In addition, the guide mechanism 47 is not limited to an arc shape. For example, the guide mechanism 47 may also be an elliptical shape or a hyperbolic shape.

[0188] The actuator 45 is attached to the housing 46 via the guide mechanism 47. The drive motor 48 moves the actuator 45 along the guide mechanism 47. By using the arc-shaped guide mechanism 47, measurement can be performed in a state where the actuator 45 is directed toward the external auditory canal regardless of the position.

[0189] In addition, the drive motor 48 has a sensor for detecting the amount of movement of the driver 45. As the sensor, for example, a motor encoder for detecting the motor rotation angle can be used. Thus, the position of the driver 45 in the housing 46 can be detected. In other words, the position of the driver 45 in the guide mechanism 47 is detected. In addition, a rotation angle sensor 143 is provided between the housing 46 and the headphone band 43B. Thus, the rotation angle of the housing 46 relative to the headphone band 43B can be detected.

[0190] Based on the movement amount and rotation angle of the driver 45, the direction of the driver 45 relative to the microphone 2L or the external auditory canal can be obtained. That is, the incident angle of the measurement signal output from the driver 45 can be obtained. Even if the wearing angle of the headset 43 changes according to the user's head shape, etc., the incident angles of the measurement signals in the second preliminary measurement and the user measurement can be made consistent. Furthermore, the incident angles of the measurement signals in the second preliminary measurement and the first preliminary measurement can be made consistent. That is, based on the rotation angle, the drive motor 48 moves the driver 45 to an appropriate position. In this way, more appropriate matching can be performed.

[0191] Modification 2

[0192] use Fig.23 as well as Fig.24 Modification 2 of Implementation Example 4 is described. Fig.23 1 is a plan view schematically showing a headphone 43 according to a second modification. Fig.241 is a diagram showing a state of wearing the headphone 43. In the second modification, since the left unit 43L and the right unit 43R have a bilaterally symmetrical structure, the description of the right unit 43R is appropriately omitted.

[0193] The left unit 43L includes a driver 45f, a driver 45m, a driver 45b, a housing 46, and an outer housing 49. In the second modification, the three drivers 45f, 45m, and 45b are accommodated in the housing 46. Of course, the number of drivers is not limited to three, as long as it is two or more. In addition, the outer housing 49 is provided on the outside of the housing 46. That is, the housing 46 becomes an inner housing accommodated inside the outer housing 49.

[0194] The driver 45f, the driver 45m, and the driver 45b are fixed to the housing 46. In the second modification, the positions of the driver 45f, the driver 45m, and the driver 45b relative to the housing 46 are not changeable. In addition, the housing 46 is fixed to the headphone band 43B. That is, the rotation angle of the housing 46 relative to the headphone band 43B does not change.

[0195] The angle of the outer shell 49 relative to the housing 46 is variable. For example, the housing 46 and the outer shell 49 are connected by a bellows-shaped protective cover (not shown). In addition, the housing 46 and the outer shell 49 may be sealed by the bellows-shaped protective cover.

[0196] like Fig.24 As shown in FIG. 1 , the angle of the outer shell 49 varies according to the head shape of the subject 1. Fig.24 In the measured subject 1, the front and rear positions of the left ear 9L and the right ear 9R are different. In the measured subject 1 whose left ear 9L and right ear 9R are in the standard position, the left and right outer shells 49 are directly opposite ( Fig.24 ).

[0197] In the measurement subject 1 located behind the left ear 9L and the right ear 9R, the left and right outer shells 49 are opened to the rear ( Fig.24 That is, the front ends of the left and right outer shells 49 are close to each other and the rear ends are separated from each other.

[0198] In the measurement subject 1 located in front of the left ear 9L and the right ear 9R, the left and right outer shells 49 are opened forward ( Fig.24 That is, the rear ends of the left and right outer shells 49 are close to each other and the front ends are separated.

[0199] By changing the angle of the outer shell 49 in this way, the wearing state can be improved. For example, the left unit 43L and the right unit 43R can be made to be in close contact with the person being measured 1. The measurement can be performed without a gap between the person being measured 1 and the left unit 43L. Therefore, the displacement of the headphone 43 can be suppressed during the measurement. In addition, the measurement space for the second preliminary measurement or the user measurement can be sealed by the outer shell 49, that is, the space around the external ear canal can be sealed, so that a more accurate measurement can be performed.

[0200] The position of the driver in the housing 46 is fixed, and the rotation angle of the housing 46 is fixed. Therefore, regardless of the head shape of the person being measured 1, the left and right housings 46 face each other. This can suppress the change in the incident angle of the measurement signal. Therefore, it is possible to perform measurement at a predetermined incident angle, and it is possible to perform measurement with higher accuracy.

[0201] By using the headphone 43 of embodiment 4 or its variant 2, the first and second external auditory canal transfer characteristics can be measured. Based on the first external auditory canal transfer characteristic, a spatial acoustic filter corresponding to the spatial acoustic transfer characteristic from the sound source to the ear is generated. Based on the second external auditory canal transfer characteristic, an inverse filter for eliminating the characteristics of the headphone is generated. Therefore, more accurate head positioning processing can be performed.

[0202] (Configuration example of driver 45f)

[0203] use Figure 5 as well as Fig.25 An example of arrangement of the driver 45f will be described. Since the arrangement of the driver 45f and the stereo speaker 5 is bilaterally symmetrical, the arrangement of the left speaker 5L and the driver 45f of the left unit 43L will be described below.

[0204] exist Figure 5 In the embodiment, the direction from the head center O to the left speaker 5L is parallel to the direction from the microphone 2L to the driver 45f. The stereo speakers 5 are generally arranged so that the head center O, the left speaker 5L, and the right speaker 5R form an equilateral triangle. Therefore, the opening angle θ from the head center O to the left speaker 5L or the right speaker 5R is 30°.

[0205] When considering the propagation mode of the wavefront of the sound wave, if it is approximately a plane sound wave, the wavefront is transmitted perpendicular to the straight line connecting the left speaker 5L and the center of the head O. Since it is a plane wave, the wavefront from the left speaker 5L to the center of the head O is parallel to the wavefront from the left speaker 5L to the left ear 9L, and similarly, the wavefront from the driver 45f to the left ear 9L is also parallel to the wavefront from the left speaker 5L to the center of the head O. Therefore, it is preferred to Figure 5 Driver 45f is configured in that way.

[0206] On the other hand, if a spherical sound wave is assumed, then it is preferred to Fig.25 The stereo speaker 5 and the driver 45f are configured as described above. Fig.25 In the embodiment, the driver 45f is arranged on the straight line from the microphone 2L toward the speaker 5L. Of course, the speaker 5L may also be arranged toward the left ear 9L. The arrangement from the microphone 2L to the speaker 5L is not limited to Figure 5 as well as Fig.25 The direction from the left microphone 2L to the driver 45f can be along the direction from the subject 1 to the speaker 5L as the sound source. Here, the position of the subject 1 can be the center of the head O or the position of the left microphone 2L.

[0207] The above-mentioned Embodiments 1 to 4 and their modifications can be combined as appropriate. In addition, the order of measuring the first to third external auditory canal transfer characteristics is not particularly limited. For example, the second external auditory canal transfer characteristic may be measured first.

[0208] Part or all of the above processing can also be performed by a computer program. The above program can be stored using various types of non-transitory computer readable media and provided to the computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer readable media include magnetic recording media (such as floppy disks, magnetic tapes, hard disk drives), optical magnetic recording media (such as optical magnetic disks), CD-ROM (Read Only Memory), CD-R, CD-R / W, semiconductor memory (such as mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)). In addition, the program can also be provided to the computer through various types of transitory computer readable media (transitory computer readable medium). Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer readable medium can provide the program to the computer via a wired communication path such as an electric wire and an optical fiber or a wireless communication path.

[0209] As mentioned above, the invention completed by the present inventors has been specifically described based on the embodiments. However, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the scope of the invention.

[0210] This application claims the benefit of priority based on Japanese patent application No. 2019-173014 filed on September 24, 2019 and Japanese patent application No. 2019-173015 filed on September 24, 2019, the disclosures of which are incorporated herein in their entirety.

[0211] Industrial Applicability

[0212] The present invention can be applied to the external head positioning process.

[0213] Explanation of symbols

[0214] U User

[0215] 1. Subject

[0216] 2L Left Microphone

[0217] 2R Right microphone

[0218] 5L Left speaker

[0219] 5R Right speaker

[0220] 9L left ear

[0221] 9R Right ear

[0222] 10 Head external positioning processing unit

[0223] 11 Convolution operation unit

[0224] 12 Convolution operation unit

[0225] 21 Convolution operation unit

[0226] 22 Convolution operation unit

[0227] 24 Adder

[0228] 25 Adder

[0229] 41 Filter unit

[0230] 42 Filter unit

[0231] 43 Headphones

[0232] 45 Drive

[0233] 45f drive

[0234] 45m drive

[0235] 45b Driver

[0236] 46 Housing

[0237] 47 Guidance Agency

[0238] 48 Drive Motor

[0239] 49 outer shell

[0240] 100 Head external positioning processing device

[0241] 111 Pulse response measurement unit

[0242] 112 ECTF characteristic acquisition unit

[0243] 113 Sending Department

[0244] 114 Receiving Department

[0245] 120 Calculation processing unit

[0246] 121 Inverse filter calculation unit

[0247] 122 filter storage unit

[0248] 200 Measurement device

[0249] 201 Measurement and processing device

[0250] 300 Server Devices

[0251] 301 Receiving Department

[0252] 302 Comparison Department

[0253] 303 Data Storage Department

[0254] 304 Extraction Department

[0255] 305 Sending Department

Claims

1. A head-outside positioning filter determination system, comprising: an output unit, worn by a user and outputting sound to the user's ears; a microphone unit, which is worn on the ear of the user and has a microphone, and the microphone picks up the sound output from the output unit; a measurement processing device that outputs a measurement signal to the output unit and acquires a sound pickup signal output from the microphone unit to measure an external auditory canal transfer characteristic; as well as A server device is capable of communicating with the measurement processing device, wherein: The measurement processing device When the driver of the output unit is located at a first position, measuring a first external auditory canal transfer characteristic from the first position to the microphone, and measuring a second external auditory canal transfer characteristic from a second position different from the first position to the microphone, sending user data related to the first and second external auditory canal transfer characteristics to the server device, The server device comprises: a data storage unit storing first preset data and second preset data in association with each other, wherein the first preset data is related to the spatial acoustic transfer characteristics from the sound source to the ear of the measured person, and the second preset data is related to the external auditory canal transfer characteristics of the ear of the measured person, and the data storage unit stores a plurality of the first and second preset data acquired for a plurality of measured persons; a comparing unit, for comparing the user data with a plurality of the second preset data; and The extracting unit extracts the first preset data from the plurality of first preset data based on the comparison result of the comparing unit.

2. The head-outside positioning filter determination system according to claim 1, wherein: generating a spatial acoustic filter corresponding to a spatial acoustic transfer characteristic from a sound source to an ear based on the extracted first preset data, An inverse filter is generated based on the second external auditory canal transfer characteristic, the inverse filter canceling the characteristic of the output unit.

3. A method for determining an off-head positioning filter, using an output unit and a microphone unit to determine an off-head positioning filter for a user, wherein the output unit is worn by the user and outputs sound to the user's ear, and the microphone unit is worn by the user's ear and has a microphone, and the microphone picks up the sound output from the output unit, wherein: The method for determining the external head positioning filter comprises the following steps: Determining a first external auditory canal transfer characteristic from a driver of the output unit located at a first position to the microphone and a second external auditory canal transfer characteristic from a driver of the output unit located at a second position to the microphone; Acquiring user data based on measurement data related to the first and second external auditory canal transfer characteristics; associating first preset data with second preset data, and storing a plurality of the first and second preset data acquired for a plurality of subjects, wherein the first preset data is related to a spatial acoustic transfer characteristic from a sound source to an ear of the subject, and the second preset data is related to an external auditory canal transfer characteristic of the ear of the subject; and By comparing the user data with a plurality of the second preset data, first preset data is extracted from the plurality of the first preset data.

4. A computer-readable storage medium storing a program, for causing a computer to execute a head-external positioning filter determination method, wherein the head-external positioning filter determination method uses an output unit and a microphone unit to determine a head-external positioning filter for a user, wherein the output unit is worn by the user and outputs sound to the user's ear, and the microphone unit is worn by the user's ear and has a microphone, and the microphone picks up the sound output from the output unit, wherein The method for determining the external head positioning filter comprises the following steps: Determining a first external auditory canal transfer characteristic from a driver of the output unit located at a first position to the microphone and a second external auditory canal transfer characteristic from a driver of the output unit located at a second position to the microphone; Acquiring user data based on measurement data related to the first and second external auditory canal transfer characteristics; Associating first preset data with second preset data, and storing a plurality of the first and second preset data acquired for a plurality of subjects, wherein the first preset data is associated with a spatial acoustic transfer characteristic from a sound source to an ear of the subject, and the second preset data is associated with an external auditory canal transfer characteristic of the ear of the subject; and By comparing the user data with a plurality of the second preset data, first preset data is extracted from the plurality of the first preset data.

5. A headset, comprising: Headphone straps; Left and right inner shells, fixed to the headphone band; A plurality of drivers are respectively fixed on the left and right inner shells; as well as The outer shells are respectively arranged outside the left and right inner shells so that the inner shells are accommodated inside the outer shells, and the angle of the outer shells relative to the inner shells is variable.

6. An external head positioning filter determination device, comprising a measurement processing unit, which outputs a measurement signal to the headphone according to claim 5 and obtains a sound pickup signal output from a microphone unit to measure an external auditory canal transfer characteristic, wherein the microphone unit is worn on the ear of the user and has a microphone, and the microphone picks up the sound output from the driver of the headphone, wherein: The head external positioning filter determination device determining a first external auditory canal transfer characteristic from the driver at a first position to the microphone, and determining a second external auditory canal transfer characteristic from the driver at a second position to the microphone, generating a spatial acoustic filter corresponding to the spatial acoustic transfer characteristic from the sound source to the ear based on the first external auditory canal transfer characteristic, Based on the second external auditory canal transfer characteristic, an inverse filter is generated, wherein the inverse filter eliminates the characteristic of the headphone.

7. A method for determining an off-head localization filter, using the headphone according to claim 5 and a microphone unit to determine an off-head localization filter, wherein the microphone unit is worn on the ear of a user and has a microphone, the microphone picking up the sound output from the driver of the headphone, wherein: The method for determining the external head positioning filter comprises the following steps: Outputting a measurement signal from the driver located at a first position, and picking up a sound signal using the microphone, thereby measuring a first external auditory canal transfer characteristic from the first position to the microphone; Outputting a measurement signal from the driver located at a second position, and picking up the sound signal using the microphone, thereby measuring a second external auditory canal transfer characteristic from the second position to the microphone; generating a spatial acoustic filter corresponding to a spatial acoustic transfer characteristic from a sound source to an ear based on the first external auditory canal transfer characteristic; and An inverse filter is generated based on the second external auditory canal transfer characteristic, the inverse filter canceling the characteristics of the headphone.

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