Signal processing device, signal processing method, and program

Abstract

To provide a signal processing device capable of suppressing providing unpleasant vibrations to a person seated on a seat.SOLUTION: A signal processing device 40 is for playing back a musical piece from one or more speakers and one or more actuators provided in a seat 100. The signal processing device 40 includes an acquiring unit 50 for acquiring data of the musical piece and an output unit 60 for outputting a sound signal in a first frequency band included in the data of the musical piece to the one or more actuators and outputting a sound signal in a frequency band excluding the first frequency band included in the data of the musical piece to the one or more speakers. The first frequency band is a band including a resonance frequency of the one or more actuators.SELECTED DRAWING: Figure 5

Description

【Technical Field】 【0001】 The present disclosure relates to a signal processing apparatus, a signal processing method, and a program. 【Background Art】 【0002】 Patent Document 1 describes a system that passes / attenuates a sound signal of a specific frequency. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2007-181135 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In recent years, a seat in which speakers and actuators are embedded has been developed, and it has become possible to reproduce sound from the speakers and give vibrations corresponding to the sound by the actuators to a person sitting on the seat. However, when the system described in Patent Document 1 is applied to such a seat, depending on the type of sound, it may give unpleasant vibrations to a person sitting on the seat. 【0005】 Therefore, the present disclosure provides a signal processing apparatus and the like that can suppress giving unpleasant vibrations to a person sitting on a seat. 【Means for Solving the Problems】 【0006】 A signal processing device according to one aspect of the present disclosure is a signal processing device for playing music from one or more speakers and one or more actuators provided on a seat, comprising: an acquisition unit for acquiring data of the music; and an output unit for outputting sound signals in a first frequency band included in the data of the music to the one or more actuators, and outputting sound signals in frequency bands other than the first frequency band included in the data of the music to the one or more speakers, wherein the first frequency band is a band that includes the resonant frequencies of the one or more actuators. 【0007】 A signal processing method according to one aspect of the present disclosure is a signal processing method for playing music from one or more speakers and one or more actuators provided on a sheet, wherein data of the music is acquired, sound signals in a first frequency band included in the data of the music are output to the one or more actuators, sound signals in frequency bands other than the first frequency band included in the data of the music are output to the one or more speakers, and the first frequency band is the resonant frequency of the one or more actuators. 【0008】 A program according to one aspect of this disclosure is a program for causing a computer to execute the above-described signal processing method. [Effects of the Invention] 【0009】 According to one aspect of this disclosure, a signal processing device, etc., can suppress the unpleasant vibrations that are transmitted to a person seated in a seat. [Brief explanation of the drawing] 【0010】 [Figure 1] This is a front view showing an example of a sheet according to Embodiment 1. [Figure 2A] These are a front view and a cross-sectional view showing an example of a speaker system according to Embodiment 1. [Figure 2B] These are a front view and a cross-sectional view showing an example of a speaker system according to Embodiment 1. [Figure 2C] These are a front view and a cross-sectional view showing an example of a speaker system according to Embodiment 1. [Figure 2D] These are a front view and a cross-sectional view showing an example of a speaker system according to Embodiment 1. [Figure 3] This graph shows an example of the frequency characteristics of the sound (sound pressure) output from the speaker and actuator of the speaker system according to Embodiment 1. [Figure 4] This is a block diagram showing an example of a signal processing device according to Embodiment 2. [Figure 5] This is a block diagram showing an example of a signal processing device according to Embodiment 3. [Figure 6] This figure shows an example of the filter characteristics of the low-pass filter provided in the output unit according to Embodiment 3. [Figure 7] This flowchart shows an example of a signal processing method according to another embodiment. [Modes for carrying out the invention] 【0011】 The embodiments will be described in detail below with reference to the drawings. 【0012】 The embodiments described below are all general or specific examples. The numerical values, shapes, materials, components, arrangement positions of components, connection configurations, steps, and the order of steps shown in the following embodiments are examples only and are not intended to limit this disclosure. 【0013】 (Embodiment 1) The speaker system according to Embodiment 1 and the seat on which the speaker system is installed will be described below with reference to the drawings. 【0014】 Figure 1 is a front view showing an example of a sheet 100 according to Embodiment 1. 【0015】 The seat 100 is, for example, a seat arranged in a moving body such as a vehicle, an aircraft, a ship, etc. Note that the seat 100 is not limited to a seat arranged in the interior of a moving body, and may be a seat arranged in a movie theater, a theater, a conference room, or may be a chair with a cushion, a seat chair, a sofa, a massage chair, etc. 【0016】 The seat 100 includes a backrest 110, a seat surface 120, and a headrest 130. The backrest 110 is a part that supports a person's back and the like when the person sits on the seat 100. The seat surface 120 is a part that supports a person's thigh and the like when the person sits on the seat 100. The headrest 130 is a part that supports a person's head and the like when the person sits on the seat 100. 【0017】 One or more speakers and one or more actuators are provided in the seat 100. A speaker is a device that converts an electrical signal into sound, and an actuator is a device that converts an electrical signal into physical movement (for example, vibration). For example, one or more actuators include a first actuator built in a position corresponding to a person's thigh on the seat surface 120 of the seat 100, or a second actuator built in a position corresponding to a person's sacrum on the backrest 110 of the seat 100 when the person sits on the seat 100. For example, one or more speakers include a first speaker built in a position corresponding to a person's lower abdomen on the backrest 110 of the seat 100, a second speaker built in a position corresponding to a person's back on the backrest 110 of the seat 100, a third speaker built in the headrest 130 of the seat 100, or a tweeter 600 attached to the headrest 130 when the person sits on the seat 100. 【0018】 For example, the seat 100 includes speaker systems 200, 400, and 500, an actuator system 300, and a tweeter 600. For example, one or more speakers are included in speaker systems 200, 400, and 500, and one or more actuators are included in speaker system 200 and actuator system 300. For example, speaker systems 200 and 400 are built into the backrest 110, actuator system 300 is built into the seat surface 120, and speaker system 500 is built into the headrest 130. 【0019】 Speaker system 200 includes a speaker 201, a speaker box 202 in which the speaker 201 is provided, and an actuator 203. The actuator 203 is provided in the speaker box 202 so as to generate vibrations on the baffle surface of the speaker box 202 (see FIG. 2A described later). 【0020】 The speaker box 202 is built into the seat 100, for example, built into the backrest 110. For example, as shown in FIG. 1, the speaker box 202 is built into a position below the center of the backrest 110 of the seat 100. Thereby, a powerful vibration by the actuator 203 in the speaker box 202 can be applied to the lower abdomen and the vicinity of the buttocks of a person sitting on the seat 100. Further, when a bass sound is output from the speaker 201, the sound waves of the bass sound from the speaker 201 in the speaker box 202 can be exposed to the lower abdomen and the vicinity of the buttocks of a person sitting on the seat 100, and a powerful sound can be provided together with the vibration. The speaker box 202 is, for example, a rectangular parallelepiped member, and is made of wood, resin, metal, or the like. 【0021】 The actuator 203 is, for example, located below the speaker 201 on the backrest 110. This allows the actuator 203 to deliver powerful vibrations to the area around the buttocks of a person seated in the seat 100. Specifically, the actuator 203 is located, for example, at a position on the backrest 110 corresponding to the person's sacrum when a person is seated in the seat 100. This allows the actuator 203 to deliver powerful vibrations to the sacrum of a person seated in the seat 100. Actuator 203 is an example of a second actuator. The actuator 203 is capable of reproducing sounds from 40Hz to 90Hz (in other words, it can generate low-frequency vibrations from 40Hz to 90Hz). For example, the actuator 203 is monaurally driven. Multiple actuators 203 may be provided within the speaker box 202. 【0022】 Speaker 201 is positioned on the backrest 110 at a location corresponding to the person's lower abdomen when the person is seated in seat 100. This allows the speaker 201 to emit deep bass sounds, exposing the person's lower abdomen to the deep bass sound waves, providing a powerful sound accompanied by vibrations. Speaker 201 is an example of a first speaker. For example, speaker 201 is a woofer capable of reproducing sounds in the 40Hz to 150Hz range. For example, speaker 201 is driven in mono. Multiple speakers 201 may be provided in speaker box 202. Alternatively, multiple speaker systems 200 may be provided on the backrest 110. 【0023】 The speaker system 200 can expose a person seated in the seat 100 to sound waves and vibrations from the backrest 110 of the seat 100. 【0024】 The actuator system 300 comprises an actuator 301 and a diaphragm 302. 【0025】 The actuator 301 is positioned on the seat surface 120 of the seat 100 at a location corresponding to the person's thighs when the person sits on the seat 100. The actuator 301 is an example of a first actuator. The actuator 301 is fixed to the diaphragm 302 so as to generate vibrations in the diaphragm 302. The diaphragm 302 is built into the seat surface 120. The diaphragm 302 is, for example, a rectangular plate-shaped member and is made of wood, resin, metal, etc. The actuator system 300 can transmit vibrations from the seat surface 120 of the seat 100 to a person sitting on the seat 100. The actuator 301 is capable of reproducing sounds from 40Hz to 90Hz (in other words, it can generate low-frequency vibrations from 40Hz to 90Hz). For example, the actuator 301 is monaurally driven. Note that the diaphragm 302 may have only one actuator 301, or it may have three or more actuators 301. 【0026】 The speaker system 400 comprises a speaker 401 and a speaker box 402 in which the speaker 401 is installed. 【0027】 The speaker box 402 is built into the seat 100, for example, into the backrest 110. For example, as shown in Figure 1, the speaker box 402 is built into the backrest 110 of the seat 100 above the center. The speaker box 402 is, for example, a rectangular parallelepiped-shaped component and is made of wood, resin, metal, or the like. 【0028】 Speaker 401 is positioned on the backrest 110 to correspond to the person's back when the person is seated in the seat 100. Speaker 401 is an example of a second speaker. For example, speaker 401 is a full-range speaker capable of reproducing sounds in the frequency range of 150Hz to 800Hz. For example, speaker 401 is driven in mono. Note that the speaker box 402 may have only one speaker 401, or it may have three or more speakers 401. Also, the backrest 110 may have multiple speaker systems 400. 【0029】 The speaker system 400 can expose a person seated in seat 100 to sound waves from the backrest 110 of seat 100. 【0030】 The speaker system 500 comprises a speaker 501 and a speaker box 502 in which the speaker 501 is installed. 【0031】 The speaker box 502 is built into the seat 100, for example, into the headrest 130. The speaker box 502 is, for example, a rectangular parallelepiped-shaped component, and is made of wood, resin, metal, or the like. 【0032】 Speaker 501 is positioned on the headrest 130 at a location corresponding to the person's head when the person is seated in the seat 100. Speaker 501 is an example of a third speaker. For example, speaker 501 is a full-range speaker capable of reproducing sounds in the frequency range from 350 Hz to 20 kHz. As shown in Figure 1, for example, two speaker systems 500 are provided on the headrest 130, and the two speaker systems 500 are driven in stereo. Note that multiple speakers 501 may be provided in the speaker box 502. Also, only one speaker system 500 may be provided on the headrest 130, or three or more speaker systems 500 may be provided. 【0033】 The speaker system 500 can expose a person seated in seat 100 to sound waves from the headrest 130 of seat 100. 【0034】 The tweeter 600 is mounted on the headrest 130. For example, the tweeter 600 is capable of reproducing sounds in the frequency range of 20kHz to 100kHz. As shown in Figure 1, for example, two tweeters 600 are mounted on the headrest 130, and the two tweeters 600 are driven in stereo. Note that the headrest 130 may have only one tweeter 600, or it may have three or more tweeters 600. 【0035】 The tweeter 600 can expose a person seated in seat 100 to sound waves from the headrest 130 of seat 100. 【0036】 Furthermore, ultrasonic waves may be output from the speaker 501 or tweeter 600 by the signal processing device 10 according to Embodiment 2 or the signal processing device 40 according to Embodiment 3, which will be described later. In this case, the ultrasonic waves can be exposed to a person seated in the seat 100 from the headrest 130 of the seat 100. 【0037】 Furthermore, the signal processing device 10 according to Embodiment 2, described later, may cause the actuator 203 to generate vibrations corresponding to the sound signal contained in the data of one of the multiple tracks that make up the song, and the speaker 201 to reproduce the sound signal contained in the data of another of the multiple tracks. Specifically, the actuator 203 may generate vibrations corresponding to the sound signal of the kick drum contained in the data of the drum track among the multiple tracks, and the speaker 201 may reproduce the sound signal contained in the data of a track other than the drums among the multiple tracks. 【0038】 Furthermore, the signal processing device 40 according to Embodiment 3, described later, causes the actuator 203 to generate vibrations corresponding to sound signals in a first frequency band included in the music data, and the speaker 201 reproduces sound signals in frequency bands other than the first frequency band included in the music data, and the first frequency band may be a band that includes the resonant frequency of the actuator 203. 【0039】 Next, the details of the speaker system 200 will be explained using Figures 2A to 2D. 【0040】 Figures 2A to 2D are a front view and a cross-sectional view showing an example of the speaker system 200 according to Embodiment 1. Figure (a) is a front view of the speaker system 200, and Figure (b) is a cross-sectional view of the speaker system 200. Note that in Figure (b), detailed cross-sectional views of the speaker 201 and actuator 203 are omitted. 【0041】 The actuator 203 is installed inside the speaker box 202 to generate vibrations on the baffle surface 202a of the speaker box 202, and is fixed, for example, to the inner surface of the speaker box 202 opposite to the baffle surface 202a, as shown in Figures 2A to 2D. The speaker 201 is fitted and fixed into a hole provided in the baffle surface 202a of the speaker box 202. In this way, the speaker 201 and the actuator 203 are integrated by the speaker box 202. 【0042】 For example, the diameter of speaker 201 is 120mm to 160mm, and the diameter of actuator 203 is 70mm to 80mm. When viewing the speaker system 200 from the front, the distance from the center of speaker 201 to the center of actuator 203 is, for example, 120mm to 150mm. Because speaker 201 and actuator 203 are integrated, the distance between speaker 201 and actuator 203 can be shortened. 【0043】 When the speaker 201 and actuator 203 are provided separately, the distance between the speaker 201 and actuator 203 tends to increase, making it easier for the phase of the sound output from the speaker 201 and the phase of the vibration from the actuator 203 to be out of sync. This can result in the inability to provide a powerful sound and vibration to a person seated in the seat 100. In contrast, according to the speaker system 200 and seat 100 of Embodiment 1, the speaker 201 and actuator 203 are integrated into a single speaker box 202. This allows for a shorter distance between the speaker 201 and actuator 203, making it easier for the phase of the sound output from the speaker 201 and the phase of the vibration from the actuator 203 to be synchronized. Therefore, a powerful sound and vibration can be provided to a person seated in the seat 100. 【0044】 Figure 3 is a graph showing an example of the frequency characteristics of sound (sound pressure) output from speaker 201 and actuator 203 of speaker system 200 according to Embodiment 1. Figure 3 shows the frequency characteristics of sound output from speaker 201 and sound (vibration) output from actuator 203, measured at a distance of 50 cm from the front of speaker system 200. 【0045】 As shown in Figure 3, there is a correspondence between the way the sound pressure level changes with respect to frequency in the speaker 201 and the actuator 203, and it can be seen that the phases of the sound (vibration) output from each are roughly aligned. 【0046】 For example, as shown in Figure 2B, the speaker box 202 may have a partition 204 that separates the actuator 203 and the speaker 201 within the speaker box 202. Since the partition 204 separates the actuator 203 and the speaker 201, the effects of vibrations from the actuator 203 on the speaker 201 can be reduced, and the effects of vibrations from the speaker 201 on the actuator 203 can be reduced. For example, the partition 204 may be made of the same material as the speaker box 202, or it may be made of a different material. 【0047】 For example, as shown in Figure 2C, the speaker box 202 may have a sealed section 205 that encloses the actuator 203 within the speaker box 202. Because the actuator 203 is sealed, the vibrations from the actuator 203 can be less likely to affect the speaker 201, and the vibrations from the speaker 201 can be less likely to affect the actuator 203. For example, the sealed section 205 may be made of the same material as the speaker box 202, or it may be made of a different material. 【0048】 For example, as shown in Figure 2D, the material of the portion 206 between the actuator 203 and the speaker 201 on the baffle surface 202a, when viewed from above, may be softer than the material of the other portions on the baffle surface 202a. Since vibrations can be absorbed by the soft material portion 206 on the baffle surface 202a, the vibrations from the actuator 203 can have less effect on the speaker 201, and the vibrations from the speaker 201 can have less effect on the actuator 203. For example, the material of portion 206 is not particularly limited as long as it is softer than the material of the other portions on the baffle surface 202a (e.g., the speaker box 202). 【0049】 For example, the speaker box 202 may have two or more partitions 204, sealed sections 205, and parts 206. 【0050】 (Embodiment 2) Next, the signal processing device according to Embodiment 2 will be described with reference to the drawings. 【0051】 Figure 4 is a block diagram showing an example of a signal processing device 10 according to Embodiment 2. In addition to the signal processing device 10, Figure 4 also shows a sheet 100. 【0052】 The signal processing device 10 is a device for playing music from one or more speakers and one or more actuators provided on the seat 100. The signal processing device 10 includes an acquisition unit 20 and an output unit 30. The signal processing device 10 includes a processor and memory, etc. The memory is ROM (Read Only Memory) and RAM (Random Access Memory), etc., and can store programs executed by the processor. The acquisition unit 20 and the output unit 30 are implemented by a processor, etc., that executes the programs stored in memory. 【0053】 The acquisition unit 20 acquires data for multiple tracks that make up a song. For example, the acquisition unit 20 acquires data for a mixed-down song from a music source such as a CD (Compact Disc), and then extracts data for multiple tracks from the acquired song data to acquire data for multiple tracks. The acquisition unit 20 may also acquire data for multiple tracks that have been prepared in advance. Multiple tracks are multiple tracks that are played simultaneously. The data for multiple tracks includes, for example, data for the vocal track, the bass track, the drum track, the guitar track, and the keyboard track. 【0054】 Furthermore, for example, the acquisition unit 20 may acquire ultrasonic signals. Although not shown, for example, the signal processing device 10 may include an ultrasonic generation unit, and the acquisition unit 20 may acquire ultrasonic signals generated by the ultrasonic generation unit. For example, the ultrasonic generation unit includes a pitch control unit and an extraction unit. 【0055】 For example, the pitch control unit controls the pitch (sound pitch) of the music data by a factor of n (where n is a real number greater than 1). By multiplying the pitch of the music data by n, the frequency components of the music data shift to an overall higher frequency side by a factor of n. The value of n is not particularly limited, but it is set to a value such that the pitch-controlled sound source data contains frequency components of 20kHz or higher. For example, the pitch control unit may obtain the largest frequency component contained in the music data, and if that largest frequency component is less than 20kHz, it may set n to a value greater than or equal to the value obtained by dividing 20kHz by that largest frequency component. For example, n may be 2 to the power of m (where m is an integer greater than or equal to 1). In other words, the pitch control unit may control the pitch of the music data by a factor of 2 to the power of m (2 times, 4 times, 8 times, ..., etc.). It should be noted that while people can experience improved physical and mental conditions from exposure to ultrasound, the degree of improvement in physical and mental conditions obtained by ultrasound may differ depending on the value of m. Therefore, the ultrasonic generation unit may be equipped with an input unit that receives information indicating the degree of improvement in the user's physical and mental state, and the pitch control unit may control the value of m according to the information received by the input unit. This allows the user to obtain the degree of improvement they desire. 【0056】 Furthermore, the pitch control unit may control the sound pressure level in addition to the pitch. In this case, the pitch control unit may increase or decrease the sound pressure level. 【0057】 The extraction unit extracts frequency components above 20 kHz from the data of a pitch-controlled song. The extraction unit is, for example, a high-pass filter. The extraction unit is implemented by, for example, a digital filter, but may also be implemented by an analog filter. 【0058】 First, the extraction unit extracts frequency components above a specific frequency (e.g., 4kHz) contained in the music data. Then, the pitch control unit may multiply the extracted frequency components by n (e.g., 10 times). In this way, frequency components above 20kHz can also be extracted. 【0059】 In this way, the ultrasonic generation unit generates an ultrasonic signal (a sound signal containing frequency components of 20 kHz or higher), and the acquisition unit 20 may acquire the ultrasonic signal from the ultrasonic generation unit. 【0060】 The output unit 30 outputs the sound signal contained in the data of one of the multiple tracks to one or more actuators, and outputs the sound signal contained in the data of another of the multiple tracks to one or more speakers. 【0061】 Depending on the sound signals contained in the data of the multiple tracks that make up the music, if they are output to the actuator, they may cause unpleasant vibrations to the person sitting in the seat 100. For example, if the sound signals contained in the bass track, which generates a sustained deep bass sound, are output to the actuator, a sustained vibration may occur, causing unpleasant vibrations to the person sitting in the seat 100. In contrast, the signal processing device 10 according to Embodiment 2 can output the sound signals contained in the data of a specific track to the actuator; in other words, it can output the sound signals contained in the data of a track that is less likely to cause unpleasant vibrations to the person sitting in the seat 100 to the actuator. Therefore, it is possible to suppress the causing of unpleasant vibrations to the person sitting in the seat 100. 【0062】 For example, the output unit 30 may output the kick drum sound signal included in the drum track data among the data of multiple tracks to one or more actuators. For example, the output unit 30 has a low-pass filter 31, and by inputting the drum track data into the low-pass filter 31, it extracts the kick drum sound signal and outputs the sound signal to one or more actuators. The low-pass filter 31 is implemented by, for example, a digital filter, but it may also be implemented by an analog filter. If data for the kick drum track exists, the acquisition unit 20 may acquire the data for the kick drum track. In this case, the output unit 30 does not need to have a low-pass filter 31, and may output the kick drum track data to one or more actuators without going through a filter. The vibration of the kick drum is not a sustained vibration due to the deep bass of a stringed instrument, but a crisp rhythmic vibration, and is less likely to cause unpleasant vibrations from the actuators to a person seated in the seat 100, thus suppressing the provision of unpleasant vibrations to a person seated in the seat 100. 【0063】 One or more actuators include, for example, an actuator 301 built into the seat surface 120 of the seat 100 at a position corresponding to the person's thigh when the person is seated on the seat 100, or an actuator 203 built into the backrest 110 of the seat 100 at a position corresponding to the person's sacrum, as described above. 【0064】 For example, the output unit 30 may output the kick drum sound signal included in the drum track data among the data of multiple tracks to the actuator 301. This makes it possible to apply the powerful vibration of the kick drum to the thighs of a person seated in the seat 100. 【0065】 For example, the output unit 30 may output the kick drum sound signal included in the drum track data among the data of multiple tracks to the actuator 203. This makes it possible to apply the powerful vibration of the kick drum to the sacrum of a person seated in the seat 100. 【0066】 Furthermore, for example, the output unit 30 may output the sound signals contained in the data of tracks other than drums among the data of multiple tracks to one or more speakers. 【0067】 One or more speakers include, for example, a speaker 201 built into the backrest 110 of the seat 100 at a position corresponding to the person's lower abdomen when the person is seated in the seat 100, a speaker 401 built into the backrest 110 of the seat 100 at a position corresponding to the person's back, a speaker 501 built into the headrest 130 of the seat 100, or a tweeter 600 attached to the headrest 130. 【0068】 For example, the output unit 30 may output the sound signal contained in the data of the base track among the data of multiple tracks to the speaker 201. For example, the output unit 30 outputs the low-frequency sound signal contained in the data of the base track to the speaker 201. This allows the deep bass sound waves of the bass to be exposed to the lower abdomen of a person seated in the seat 100, providing a powerful sound along with vibration. For example, the output unit 30 has a low-pass filter 34, and by inputting the data of the base track into the low-pass filter 34, it extracts the low-frequency sound signal of the bass and outputs the sound signal to the speaker 201. The low-pass filter 34 is implemented by, for example, a digital filter, but it may also be implemented by an analog filter. 【0069】 For example, the output unit 30 may output to the speaker 401 the snare sound signal included in the drum track data, the sound signal included in the bass track data, and the sound signal included in the vocal track data, among the data of multiple tracks. 【0070】 For example, the output unit 30 has a mid-range filter 32, and by inputting the drum track data into the mid-range filter 32, it extracts the snare sound signal and outputs the sound signal to the speaker 401. The mid-range filter 32 is a filter with a higher passband than the low-range filter 31. The mid-range filter 32 can be implemented by, for example, a digital filter, but it may also be implemented by an analog filter. If snare track data exists, the acquisition unit 20 may acquire the snare track data, in which case the output unit 30 does not need to have a mid-range filter 32, and the snare track data may be output to the speaker 401 without going through a filter. 【0071】 For example, the output unit 30 has a mid-range filter 35, and by inputting the data of the bass track into the mid-range filter 35, it extracts the mid-range sound signal of the bass and outputs the sound signal to the speaker 401. The mid-range filter 35 is a filter with a higher passband than the low-frequency filter 34. The mid-range filter 35 can be implemented by, for example, a digital filter, but it may also be implemented by an analog filter. 【0072】 For example, the output unit 30 has an adder 36, and the snare sound signal, the midrange bass sound signal, and the vocal sound signal are input to the adder 36. As a result, the output unit 30 can add the snare sound signal, the midrange bass sound signal, and the vocal sound signal, and output the added sound signal to the speaker 401. 【0073】 This allows the snare, bass, and vocal sounds to be output from a position corresponding to the back of the person seated in seat 100. 【0074】 For example, the output unit 30 may output the sound signals contained in the data of tracks other than the bass and drums, as well as the hi-hat sound signal contained in the drum track data, to the speaker 501 or tweeter 600. 【0075】 For example, the output unit 30 has a high-frequency filter 33, and by inputting the drum track data into the high-frequency filter 33, it extracts the hi-hat sound signal and outputs the sound signal to the speaker 501 and tweeter 600. The high-frequency filter 33 is a filter with a higher passband than the mid-frequency filter 32. The high-frequency filter 33 can be implemented by, for example, a digital filter, but it may also be implemented by an analog filter. If data for the hi-hat track exists, the acquisition unit 20 may acquire the data for the hi-hat track, in which case the output unit 30 does not need to have a high-frequency filter 33, and the hi-hat track data may be output to the speaker 501 and tweeter 600 without going through a filter. 【0076】 For example, the output unit 30 has an adder / subtractor 37. For example, the output unit 30 inputs the sound signals included in the total track data, which includes all the data from the vocal track, bass track, drum track, guitar track, and keyboard track, as well as the hi-hat sound signal, to the positive terminal of the adder / subtractor 37. Alternatively, for example, the output unit 30 inputs the sound signals included in the drum track data and the bass track data to the negative terminal of the adder / subtractor 37. This allows the output unit 30 to subtract the sound signals included in the drum track data and the bass track data from the total track data, and then add the subtracted sound signals to the hi-hat sound signal. In other words, a signal obtained by adding the sound signals included in the data of tracks other than bass and drums, as well as the hi-hat sound signal included in the drum track data, can be output to the speaker 501 and tweeter 600. 【0077】 This allows the headrest 130 to output sounds other than bass and drums (for example, vocals, guitar, keyboard sounds, etc.) as well as hi-hat sounds. 【0078】 For example, the output unit 30 may further output an ultrasonic signal to the speaker 501 or tweeter 600. For example, the output unit 30 has an adder 38, and as described above, when the acquisition unit 20 acquires an ultrasonic signal, the output unit 30 inputs the sound signal included in the total track data and the ultrasonic signal to the adder 38. This allows the sound signal included in the total track data and the ultrasonic signal to be added together, and the sound signal with the ultrasonic signal added can be output to the speaker 501 or tweeter 600. 【0079】 This allows ultrasound to be exposed to the head of a person seated in seat 100, thereby providing a hypersonic effect to the person seated in seat 100. Specifically, it can improve cerebral blood flow and thus improve the physical and mental state of the person seated in seat 100. 【0080】 (Embodiment 3) Next, the signal processing device according to Embodiment 3 will be described with reference to the drawings. 【0081】 Figure 5 is a block diagram showing an example of a signal processing device 40 according to Embodiment 3. In addition to the signal processing device 40, Figure 5 also shows a sheet 100. 【0082】 The signal processing device 40 is a device for playing music from one or more speakers and one or more actuators provided on the seat 100. The signal processing device 10 includes an acquisition unit 50 and an output unit 60. The signal processing device 40 includes a processor and memory, etc. The memory is ROM and RAM, etc., and can store programs executed by the processor. The acquisition unit 50 and the output unit 60 are realized by a processor, etc., that executes the programs stored in the memory. 【0083】 The acquisition unit 50 acquires music data. Specifically, the acquisition unit 50 acquires mixed-down music data from a music source such as a CD. 【0084】 Furthermore, for example, the acquisition unit 50 may acquire an ultrasonic signal. For example, the signal processing device 40 may include an ultrasonic generation unit, similar to the signal processing device 10, and the acquisition unit 50 may acquire the ultrasonic signal generated by the ultrasonic generation unit. Details of the ultrasonic generation unit are the same as those described in Embodiment 2, so a detailed explanation will be omitted. 【0085】 The output unit 60 outputs sound signals in a first frequency band included in the music data to one or more actuators, and outputs sound signals in frequency bands other than the first frequency band included in the music data to one or more speakers. The first frequency band is a band that includes the resonant frequencies of one or more actuators. For example, the output unit 60 outputs sound signals in the first frequency band to one or more actuators and outputs sound signals in frequency bands other than the first frequency band to the one or more speakers by filtering the music data. For example, one or more actuators include actuators 203 or 301, and one or more speakers include speaker 201. 【0086】 When the system described in Patent Document 1 is applied to a seat with an actuator and a speaker built in, signals of the same frequency band are input to both the actuator and the speaker, which can cause unpleasant vibrations to the person sitting in the seat. In contrast, in Embodiment 3, since the frequency bands of the signals output to the actuator 203 or 301 and the speaker 201 are different, vibrations and deep bass can be exposed to the optimal location of the person sitting in the seat 100 from both the actuator 203 or 301 and the speaker 201, thereby suppressing the unpleasant vibrations to the person sitting in the seat 100. 【0087】 For example, the vibration of the kick drum is not a sustained vibration caused by the deep bass of a stringed instrument, but rather a crisp, rhythmic vibration, making it less likely to cause unpleasant vibrations to a person seated in seat 100. Furthermore, the vibration frequency of such rhythmic vibrations is close to the resonant frequency of actuator 203 or 301. Therefore, by outputting a sound signal in the first frequency band that includes the resonant frequency of actuator 203 or 301, specifically a sound signal of rhythmic vibration with a vibration frequency close to the resonant frequency of actuator 203 or 301, unpleasant vibrations to a person seated in seat 100 can be suppressed. For example, the actuator 203 or 301 can deliver powerful vibrations to the thigh or sacrum of a person seated in seat 100. Also, if deep bass is output from speaker 201, the lower abdomen of a person seated in seat 100 can be exposed to deep bass sound waves, providing powerful sound along with vibrations. 【0088】 For example, the output unit 60 includes low-pass filters 61 and 62. For example, the output unit 60 inputs music data into the low-pass filter 61 to extract sound signals in a first frequency band included in the music data and outputs these sound signals to actuators 203 and 301. Also, for example, the output unit 60 inputs music data into the low-pass filter 62 to extract sound signals in frequency bands other than the first frequency band included in the music data and outputs these sound signals to speaker 201. The low-pass filters 61 and 62 are implemented by digital filters, for example, but may also be implemented by analog filters. 【0089】 Figure 6 shows an example of the filter characteristics of the low-pass filters 61 and 62 provided in the output unit 60 according to Embodiment 3. Figure 6(a) shows the filter characteristics of the low-pass filter 61, and Figure 6(b) shows the filter characteristics of the low-pass filter 62. 【0090】 As shown in Figure 6(a), the low-pass filter 61 is, for example, a band-pass filter with a high Q value, and its passband is set to include the resonant frequencies of actuators 203 and 301 (e.g., 90 Hz). This allows the audio signals in the first frequency band (e.g., the band including 90 Hz) contained in the music data to be output to actuators 203 and 301, and actuators 203 and 301 can generate rhythmic vibrations such as kick drums. 【0091】 On the other hand, as shown in Figure 6(b), the low-pass filter 62 is, for example, a band-elimination filter, with the first frequency band as a stopband. Because the low-pass filter 62 attenuates the sound signal in the first frequency band, which includes the resonant frequencies of actuators 203 and 301, amplitude interference between sound signals in frequency bands other than the first frequency band and sound signals in the first frequency band can be suppressed. 【0092】 For example, the output unit 60 may have a mid-range filter 63. The mid-range filter 63 is a filter with a higher passband than the low-range filter 61. For example, the output unit 60 inputs the music data into the mid-range filter 63 to extract the mid-range sound signals (e.g., 150Hz to 800Hz) contained in the music data and outputs these sound signals to the speaker 401. The mid-range filter 63 is implemented by, for example, a digital filter, but it may also be implemented by an analog filter. This makes it possible to output sounds such as snare drum, bass, and vocals from a position corresponding to the back of a person seated in the seat 100. 【0093】 For example, the output unit 60 may have a mid-high frequency filter 64. The mid-high frequency filter 64 is a filter with a higher passband than the mid-frequency filter 63. For example, the output unit 60 inputs the music data to the mid-high frequency filter 64 to extract the mid-high frequency sound signals (e.g., 350Hz to 100kHz) contained in the music data, and outputs these sound signals to the speaker 501 or tweeter 600. The mid-frequency filter 63 and the mid-high frequency filter 64 are implemented by digital filters, for example, but may also be implemented by analog filters. This makes it possible to output sounds such as guitar, keyboard, vocals, and hi-hats from the headrest 130. 【0094】 For example, the output unit 60 may further output an ultrasonic signal to the speaker 501 or tweeter 600. For example, the output unit 60 has an adder 65, and as described above, when the acquisition unit 50 acquires an ultrasonic signal, the output unit 60 inputs the music data and the ultrasonic signal to the adder 65. This allows the music data and the ultrasonic signal to be added together, and an audio signal containing the ultrasonic signal extracted from the music data with the ultrasonic signal added can be output to the speaker 501 or tweeter 600. 【0095】 This allows ultrasound to be exposed to the head of a person seated in seat 100, thereby providing a hypersonic effect to the person seated in seat 100. Specifically, it can improve cerebral blood flow and thus improve the physical and mental state of the person seated in seat 100. 【0096】 (Other embodiments) As described above, embodiments have been explained as examples of the technology relating to this disclosure. However, the technology relating to this disclosure is not limited thereto and can be applied to embodiments that have been modified, replaced, added, omitted, etc., as appropriate. For example, the following modified examples are also included in one embodiment of this disclosure. 【0097】 For example, in the above embodiment 1, an example was described in which the seat 100 includes speaker systems 200, 400, and 500 and actuator system 300, but the seat 100 only needs to include at least speaker system 200. 【0098】 For example, in the above embodiment 1, an example was described in which the speaker system 200 is built into the backrest 110 of the seat 100 below the center. However, the speaker system 200 may also be built into the backrest 110 of the seat 100 above the center, or it may be built into the seat surface 120. 【0099】 For example, in embodiments 2 and 3 described above, the seat 100 is provided with actuators 203 and 301, speakers 201, 401 and 501, and a tweeter 600, but it is not limited to this. For example, the seat 100 only needs to be provided with at least one actuator from actuators 203 and 301, and at least one speaker from speakers 201, 401 and 501 and a tweeter 600. 【0100】 For example, in embodiments 2 and 3 described above, an example was explained in which the ultrasonic signal is output from speaker 501 or tweeter 600, but the ultrasonic signal does not necessarily have to be output from speaker 501 or tweeter 600. 【0101】 For example, in embodiments 1 to 3 described above, an example was described in which the seat 100 is equipped with a headrest 130, but the seat 100 does not necessarily have to be equipped with a headrest 130. 【0102】 For example, this disclosure can be implemented not only as a signal processing device 40, but also as a signal processing method that includes steps (processing) performed by the components constituting the signal processing device 40. 【0103】 Figure 7 is a flowchart showing an example of a signal processing method according to another embodiment. 【0104】 The signal processing method is a signal processing method for playing music from one or more speakers and one or more actuators provided on sheet 100, and as shown in Figure 7, it includes the process of acquiring music data (step S11), outputting sound signals in a first frequency band included in the music data to one or more actuators (step S12), and outputting sound signals in frequency bands other than the first frequency band included in the music data to one or more speakers (step S13), wherein the first frequency band is the resonant frequency of one or more actuators. 【0105】 For example, the steps in the signal processing method may be performed by a computer (computer system). This disclosure can be implemented as a program for causing a computer to perform the steps included in the signal processing method. 【0106】 Furthermore, this disclosure can be implemented as a non-temporary computer-readable recording medium, such as a CD-ROM on which the program is recorded. 【0107】 For example, if this disclosure is implemented in a program (software), each step is executed by the program using hardware resources such as the computer's CPU, memory, and input / output circuits. In other words, each step is executed by the CPU obtaining data from memory or input / output circuits, performing calculations, and outputting the calculation results to memory or input / output circuits. 【0108】 Furthermore, each component included in the signal processing device 40 of the above embodiment may be implemented as a dedicated or general-purpose circuit. 【0109】 Furthermore, each component included in the signal processing device 40 of the above embodiment may be implemented as an integrated circuit (IC), specifically a Large Scale Integration (LSI). 【0110】 Furthermore, the integrated circuit is not limited to LSIs; it may also be implemented using a dedicated circuit or a general-purpose processor. A programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor in which the connections and settings of the circuit cells inside the LSI can be reconfigured may also be used. 【0111】 Furthermore, if advances in semiconductor technology or other derived technologies lead to the emergence of integrated circuit technologies that replace LSIs, then naturally, the individual components included in the signal processing device 40 may be integrated using those technologies. 【0112】 Furthermore, this disclosure also includes forms obtained by applying various modifications to the embodiments that a person skilled in the art could conceive, and forms realized by arbitrarily combining the components and functions of each embodiment without departing from the spirit of this disclosure. 【0113】 (Note) Based on the above description of embodiments, the following technologies are disclosed. 【0114】 (Technical 1) A signal processing device for playing music from one or more speakers and one or more actuators provided on a sheet, comprising: an acquisition unit for acquiring data of the music; and an output unit for outputting sound signals in a first frequency band included in the data of the music to the one or more actuators, and outputting sound signals in frequency bands other than the first frequency band included in the data of the music to the one or more speakers, wherein the first frequency band is a band that includes the resonant frequencies of the one or more actuators. 【0115】 When the system described in Patent Document 1 is applied to a seat with an actuator and a speaker built in, signals of the same frequency band are input to both the actuator and the speaker, which can cause unpleasant vibrations to the person sitting in the seat. In contrast, in this disclosure, since the frequency bands of the signals output to the actuator and the speaker are different, vibrations and bass sounds can be exposed to the optimal location of the person sitting in the seat from both the actuator and the speaker, thereby suppressing the unpleasant vibrations to the person sitting in the seat. For example, the vibration of a kick drum is not a sustained vibration caused by the bass sound of a stringed instrument, but rather a crisp rhythmic vibration, which is less likely to cause unpleasant vibrations to the person sitting in the seat. Furthermore, the vibration frequency of such rhythmic vibrations is close to the resonance frequency of the actuator. Therefore, by outputting a sound signal in a first frequency band that includes the resonance frequency of the actuator, specifically a sound signal of rhythmic vibration with a vibration frequency close to the resonance frequency of the actuator, it is possible to suppress the unpleasant vibrations to the person sitting in the seat. 【0116】 (Technical 2) The signal processing device according to Technical 1, wherein the output unit outputs sound signals in the first frequency band to one or more actuators by filtering the data of the music. 【0117】 In this way, by filtering the music data, it is possible to extract sound signals in the first frequency band. 【0118】 (Technical 3) The signal processing device according to Technical 1 or 2, wherein the output unit filters the data of the music and outputs sound signals in frequency bands other than the first frequency band to one or more speakers. 【0119】 In this way, by filtering the music data, it is possible to extract sound signals from frequency bands other than the first frequency band. 【0120】 (Technical 4) The signal processing device according to any one of Technical 1 to 3, wherein the one or more actuators include a first actuator built into the seat surface of the seat at a position corresponding to the person's thigh when the person is seated on the seat, or a second actuator built into the backrest of the seat at a position corresponding to the person's sacrum, and the one or more speakers include a first speaker built into the backrest of the seat at a position corresponding to the person's lower abdomen when the person is seated on the seat. 【0121】 According to this, the actuator can deliver powerful vibrations to the thighs or sacrum of a person seated in the seat. Furthermore, when deep bass is output from the first speaker, the deep bass sound waves can be exposed to the lower abdomen of the person seated in the seat, providing powerful sound along with vibrations. 【0122】 (Technical 5) The signal processing device according to any one of Technical 1 to 4, wherein the output unit further outputs an ultrasonic signal to a speaker built into the headrest of the seat, or a tweeter attached to the headrest. 【0123】 According to this, ultrasound can be exposed to the head of a person seated in a seat, thereby providing a hypersonic effect to the person seated. Specifically, it can improve cerebral blood flow and thus improve the physical and mental state of the person seated in the seat. 【0124】 (Technical 6) A signal processing method for playing music from one or more speakers and one or more actuators provided on a sheet, wherein data of the music is acquired, sound signals in a first frequency band included in the data of the music are output to the one or more actuators, sound signals in frequency bands other than the first frequency band included in the data of the music are output to the one or more speakers, and the first frequency band is the resonant frequency of the one or more actuators. 【0125】 This method provides a signal processing method that can suppress unpleasant vibrations for people seated in a seat. 【0126】 (Technical 7) A program for causing a computer to execute the signal processing method described in Technical 6. 【0127】 According to this, it is possible to provide a program that can suppress unpleasant vibrations that are transmitted to people seated in the seats. [Industrial applicability] 【0128】 This disclosure can be applied, for example, to a seat that incorporates a speaker and actuator and is capable of playing music. [Explanation of Symbols] 【0129】 10, 40 Signal Processing Equipment 20, 50 acquisition part 30, 60 Output section 31, 34, 61, 62 Low-pass filters 32, 35, 63 Mid-range filters 33 High-frequency filters 36, 38, 65 Adder 37 Addition and Subtraction Machine 64 Mid-to-high frequency filter 100 sheets 110 Backrest 120 seat 130 Headrest 200, 400, 500 speaker systems 201, 401, 501 speakers 202, 402, 502 speaker boxes 202a Baffle surface Actuators 203, 301 204 partitions 205 Sealed part 206 parts 300 Actuator System 302 Diaphragm 600 Tweeter

Claims

[Claim 1] A signal processing device for playing music from one or more speakers and one or more actuators provided on a seat, An acquisition unit that acquires data for the aforementioned song, The system includes an output unit that outputs sound signals in a first frequency band included in the data of the music to one or more actuators, and outputs sound signals in frequency bands other than the first frequency band included in the data of the music, including frequency bands higher than the first frequency band and frequency bands lower than the first frequency band, to one or more speakers. The first frequency band is a band that includes the resonant frequencies of the one or more actuators. Signal processing device. [Claim 2] The output unit outputs sound signals in the first frequency band to the one or more actuators by filtering the data of the music. The signal processing apparatus according to claim 1. [Claim 3] The output unit filters the music data and outputs sound signals in frequency bands excluding the first frequency band to the one or more speakers. The signal processing apparatus according to claim 1. [Claim 4] The one or more actuators include a first actuator built into the seat surface of the seat at a position corresponding to the person's thigh when the person is seated on the seat, or a second actuator built into the backrest of the seat at a position corresponding to the person's sacrum. The one or more speakers include a first speaker that is built into the backrest of the seat at a position corresponding to the lower abdomen of the person when the person is seated in the seat. The signal processing apparatus according to any one of claims 1 to 3. [Claim 5] The output unit further outputs the ultrasonic signal to a speaker built into the headrest of the seat, or a tweeter attached to the headrest. The signal processing apparatus according to any one of claims 1 to 3. [Claim 6] A signal processing method for playing music from one or more speakers and one or more actuators provided on a seat, Obtain the data for the aforementioned song, The sound signals in the first frequency band included in the data of the aforementioned music are output to the one or more actuators. A sound signal is output to one or more speakers, which includes frequency bands other than the first frequency band included in the data of the aforementioned musical piece, and which includes frequency bands higher than the first frequency band and frequency bands lower than the first frequency band. The first frequency band is the resonant frequency of the one or more actuators. Signal processing method. [Claim 7] A program for causing a computer to execute the signal processing method described in claim 6.

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