Speaker system, signal processing device, and signal processing method

Abstract

To provide a speaker system and the like with a wider playback range than before.SOLUTION: A speaker system 1 includes: a first vibration actuator 130 that is fixed to a first vibration surface to give vibration to a first vibration surface to generate sound; and a first tweeter 230 that outputs high-pitched sounds.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a speaker system, a signal processing device, and a signal processing method. [Background technology]

[0002] 2. Description of the Related Art Conventionally, an acoustic device using a vibration actuator and a speaker is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 2-883 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the audio device of Patent Document 1 has problems in that it is difficult to reproduce high-pitched sounds, and the reproduction band is narrow.

[0005] Therefore, the present disclosure provides a speaker system, a signal processing device, and a signal processing method that have a wider reproduction band than conventional ones. [Means for solving the problem]

[0006] A speaker system according to an aspect of the present disclosure includes a vibration actuator fixed to a first vibrating surface for generating sound by applying vibration to the first vibrating surface, and a tweeter for outputting high-pitched sounds.

[0007] A signal processing device according to one embodiment of the present disclosure includes a signal acquisition unit that acquires sound source data, an ultrasound generation unit that generates an ultrasound signal for ultrasound based on the acquired sound source data, and a low-frequency generation unit that generates a low-frequency signal for low-frequency vibration based on the acquired sound source data, wherein the ultrasound generation unit controls the pitch of the acquired sound source data by a factor of n (n is a real number greater than 1), extracts a first frequency component of 20 kHz or more included in the pitch-controlled sound source data, and generates the ultrasound signal by adding the extracted first frequency component to the acquired sound source data, and the low-frequency generation unit controls the pitch of the acquired sound source data by a factor of 1 / l (l is a real number greater than 1), extracts a second frequency component of 90 Hz or less included in the pitch-controlled sound source data, and generates the low-frequency signal by adding the extracted second frequency component to the acquired sound source data.

[0008] A signal processing method according to one aspect of the present disclosure acquires sound source data, generates an ultrasonic signal for ultrasonic waves based on the acquired sound source data, and generates a low-frequency signal for low-frequency vibration based on the acquired sound source data. In generating the ultrasonic signal, the pitch of the acquired sound source data is controlled by a factor of n (n is a real number greater than 1), a first frequency component of 20 kHz or more included in the pitch-controlled sound source data is extracted, and the extracted first frequency component is added to the acquired sound source data to generate the ultrasonic signal. In generating the low-frequency signal, the pitch of the acquired sound source data is controlled by a factor of 1 / l (l is a real number greater than 1), a second frequency component of 90 Hz or less included in the pitch-controlled sound source data is extracted, and the extracted second frequency component is added to the acquired sound source data to generate the low-frequency signal. Effect of the Invention

[0009] According to one aspect of the present disclosure, it is possible to realize a speaker system or the like that has a wider reproduction band than conventional systems. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a configuration of a speaker system according to an embodiment. [Diagram 2] FIG. 2 is a block diagram illustrating a functional configuration of the signal processing device according to the embodiment. [Diagram 3] FIG. 3 is a diagram illustrating a configuration of a first speaker according to the embodiment. [Figure 4] FIG. 4 is a diagram illustrating characteristics of the first speaker according to the embodiment. [Diagram 5] FIG. 5 is a flowchart showing the operation of the signal processing device according to the embodiment. [Figure 6A] FIG. 6A is a flowchart showing an operation of generating an ultrasound signal according to an embodiment. [Figure 6B] FIG. 6B is a flowchart showing a generating operation of a low-frequency signal according to the embodiment. [Figure 7] FIG. 7 is a diagram showing a configuration of a speaker according to the first modification of the embodiment. [Figure 8] FIG. 8 is a diagram showing a configuration of a speaker system according to the second modification of the embodiment. [Figure 9] FIG. 9 is a diagram showing an example of installation of the first sub-vibration actuator and the second sub-vibration actuator according to the second modification of the embodiment. [Figure 10] FIG. 10 is a diagram showing a first application example of the speaker system according to the embodiments. [Figure 11] FIG. 11 is a diagram showing a second application example of the speaker system according to the embodiments. [Figure 12] FIG. 12 is a diagram showing a third application example of the speaker system according to the embodiments and the like. [Figure 13] FIG. 13 is a diagram showing a fourth application example of the speaker system according to the embodiments and the like. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A speaker system according to a first aspect of the present disclosure includes a vibration actuator fixed to a first vibrating surface for generating sound by applying vibration to the first vibrating surface, and a tweeter for outputting high-pitched sounds.

[0012] As a result, since the speaker system includes a tweeter, it is possible to output sounds in a higher frequency range (for example, ultrasonic range) compared to a case where a tweeter is not included, and therefore it is possible to realize a speaker system 1 with a wider reproduction band than conventional speaker systems.

[0013] Also, for example, a speaker system according to a second aspect may be the speaker system according to the first aspect, further comprising a first sub-vibration actuator fixed to a second vibration surface and applying vibration to the second vibration surface to produce sound, and a second sub-vibration actuator fixed to a third vibration surface and applying vibration to the third vibration surface to produce sound.

[0014] This allows the vibration actuator to effectively output low-frequency sounds, widening the bass reproduction band, thereby realizing a speaker system with a wider reproduction band than ever before.

[0015] Furthermore, for example, a speaker system according to a third aspect may be a speaker system according to the second aspect, wherein the first sub-vibration actuator and the second sub-vibration actuator are provided on a cushion body that comes into contact with a person's lower back when the person sits down, and the first sub-vibration actuator and the second sub-vibration actuator output sound toward the lower back.

[0016] This allows the vibrations to be felt by the body, adding a sense of low frequency range.

[0017] Also, for example, a speaker system according to a fourth aspect is a speaker system according to any one of the first to third aspects, and the tweeter may be arranged to overlap the vibration actuator when viewed in the axial direction of the vibration actuator.

[0018] As a result, a speaker system in which the tweeter and the vibration actuator are arranged one on top of the other can be used to achieve a wider reproduction band than before. Also, because the tweeter and the vibration actuator are arranged one on top of the other, the area in a plan view can be reduced, realizing space saving.

[0019] Also, for example, a speaker system according to a fifth aspect is the speaker system according to any one of the first to third aspects, and the tweeter may be arranged alongside the vibration actuator when viewed in the axial direction of the vibration actuator.

[0020] This makes it possible to achieve a wider reproduction band than ever before by using a speaker system in which a tweeter and a vibration actuator are arranged side by side.

[0021] Also, for example, a speaker system according to a sixth aspect is a speaker system according to any one of the first to fifth aspects, and the high-frequency sounds output by the tweeter may include at least the inaudible sounds among the audible sounds and the inaudible sounds higher than the audible range.

[0022] As a result, the tweeter outputs sounds in the inaudible range, making it possible to widen the reproduction band compared to when only sounds in the audible range are output.

[0023] Furthermore, for example, a speaker system according to a seventh aspect may be the speaker system according to the sixth aspect, in which the high-pitched sound output by the tweeter further includes a sound in the audible range.

[0024] As a result, the tweeter also outputs sounds in the audible range, allowing people to hear sounds on the higher end of the audible range. For example, compared to when a tweeter is not provided, the directionality and clarity of sounds in the audible range are improved, allowing the person to feel this through the sounds they hear.

[0025] Also, for example, a signal processing device according to an eighth aspect includes a signal acquisition unit that acquires sound source data, an ultrasonic generation unit that generates an ultrasonic signal for ultrasonic waves based on the acquired sound source data, and a low-frequency generation unit that generates a low-frequency signal for low-frequency vibration based on the acquired sound source data, wherein the ultrasonic generation unit controls the pitch of the acquired sound source data by a factor of n (n is a real number greater than 1), extracts a first frequency component of 20 kHz or more contained in the pitch-controlled sound source data, and generates the ultrasonic signal by adding the extracted first frequency component to the acquired sound source data, and the low-frequency generation unit controls the pitch of the acquired sound source data by a factor of 1 / l (l is a real number greater than 1), extracts a second frequency component of 90 Hz or less contained in the pitch-controlled sound source data, and generates the low-frequency signal by adding the extracted second frequency component to the acquired sound source data.

[0026] This generates ultrasonic signals and low-frequency signals, and by outputting the generated signals from a speaker, the band of sound output from the speaker (playback band) can be made wider than before.

[0027] Also, for example, a signal processing device according to a ninth aspect may be the signal processing device according to the eighth aspect, and may include an output section that outputs the generated ultrasonic signal to a tweeter included in a speaker system according to any one of the first to seventh aspects, and outputs the generated low-frequency signal to a vibration actuator included in the speaker system according to any one of the first to seventh aspects.

[0028] As a result, an ultrasonic signal is output from the tweeter and a low-frequency signal is output from the vibration actuator, making it possible to effectively widen the reproduction bands of both the treble and bass frequencies.

[0029] Also, for example, a signal processing method according to a tenth aspect acquires sound source data, generates an ultrasonic signal for ultrasonic waves based on the acquired sound source data, and generates a low-frequency signal for low-frequency vibration based on the acquired sound source data. In generating the ultrasonic signal, the pitch of the acquired sound source data is controlled by a factor of n (n is a real number greater than 1), a first frequency component of 20 kHz or more included in the pitch-controlled sound source data is extracted, and the extracted first frequency component is added to the acquired sound source data to generate the ultrasonic signal. In generating the low-frequency signal, the pitch of the acquired sound source data is controlled by a factor of 1 / l (l is a real number greater than 1), a second frequency component of 90 Hz or less included in the pitch-controlled sound source data is extracted, and the extracted second frequency component is added to the acquired sound source data to generate the low-frequency signal.

[0030] This provides the same effects as the above-mentioned signal processing device.

[0031] These general or specific aspects may be realized by a system, a method, an integrated circuit, a computer program, or a non-transitory recording medium such as a computer-readable CD-ROM, or may be realized by any combination of the system, the method, the integrated circuit, the computer program, or the recording medium. The program may be stored in the recording medium in advance, or may be supplied to the recording medium via a wide area communication network including the Internet.

[0032] Hereinafter, the embodiment will be specifically described with reference to the drawings.

[0033] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, components, component arrangements and connection forms, steps, and order of steps shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components that are not described in the independent claims are described as optional components.

[0034] In addition, each figure is a schematic diagram and is not necessarily illustrated precisely. Therefore, for example, the scales in each figure do not necessarily match. In addition, in each figure, substantially the same configurations are given the same reference numerals, and duplicated explanations are omitted or simplified.

[0035] Furthermore, in this specification, terms indicating relationships between elements such as "same" and numerical values ​​and numerical ranges are not expressions that only indicate the strict meaning, but are expressions that include a substantially equivalent range, for example, a difference of about a few percent (or about 10%).

[0036] In addition, in this specification, ordinal numbers such as "first" and "second" do not refer to the number or order of components, unless otherwise specified, but are used for the purpose of avoiding confusion and distinguishing between components of the same type.

[0037] (Embodiment) Hereinafter, the speaker system according to the present embodiment will be described with reference to FIGS. 1 to 6B.

[0038] [1. Speaker system configuration] First, the configuration of a speaker system according to the present embodiment will be described with reference to Figures 1 to 4. Figure 1 is a diagram showing the configuration of a speaker system 1 according to the present embodiment.

[0039] 1, the speaker system 1 includes a wireless device 10A, an external device 10B, a signal processing device 20, a first speaker 30, and a second speaker 40. Note that the speaker system 1 only needs to include at least one of the first speaker 30 and the second speaker 40. The signal processing device 20 may be realized as a standalone device.

[0040] The speaker system 1 is a system for outputting sounds from a first speaker 30 and a second speaker 40 using signals generated based on sound source data input from a wireless device 10A or an external device 10B.

[0041] The wireless device 10A is connected to the signal processing device 20 so as to be able to wirelessly communicate with the signal processing device 20, and outputs sound source data to the signal processing device 20. The wireless device 10A is, for example, but is not limited to, a smartphone or a tablet terminal. The wireless communication is performed based on a wireless communication standard such as, for example, but is not limited to, Wi-Fi (registered trademark), Bluetooth (registered trademark), or ZigBee (registered trademark).

[0042] The external device 10B is connected to the signal processing device 20 so as to be capable of wired communication, and outputs sound source data to the signal processing device 20. The external device 10B is, for example, but not limited to, a PC (personal computer) or a USB (Universal Serial Bus) terminal. The wired communication is, for example, but not limited to, communication using power line communication (PLC) or a wired LAN.

[0043] The sound source data may be sound source data that does not include frequency components of 20 kHz or more. For example, the sound source data may be music data or environmental sound data. For example, the sound source data may be acquired from a music source such as a CD (Compact Disc). The sound source data may be sound source data for generating a pseudo moving sound according to the moving state of a moving body such as a vehicle. The pseudo moving sound is, for example, a sound that imitates an engine sound.

[0044] The signal processing device 20 is an information processing device for generating an ultrasonic signal for ultrasonic waves and a low-frequency signal for low-frequency vibration from the acquired sound source data. It is known that a hypersonic effect that improves the mental and physical condition is obtained by giving a person a sound containing a frequency component of 20 kHz or more (for example, a sound in an inaudible range), and the signal processing device 20 generates sound source data for obtaining the hypersonic effect as an ultrasonic signal. It is also known that a gamma wave effect that improves stress, physical condition, etc. is obtained by giving a person a sound containing a frequency component of gamma waves (40 Hz), which induces gamma waves in the human brain, and the signal processing device 20 may further generate sound source data for obtaining the gamma wave effect as a low-frequency signal.

[0045] In this embodiment, the signal processing device 20 is realized by a DSP (Digital Signal Processor) that processes digital signals and a DSP amplifier that integrates a power amplifier that drives a speaker by amplifying and outputting an input signal, but is not limited to this. Note that the signal processing device 20 only needs to have at least a DSP out of the DSP and the power amplifier.

[0046] The signal processing device 20 is configured so that it can be powered by either a cigarette lighter socket (for vehicle use) or an AC adapter (for home use).

[0047] FIG. 2 is a block diagram showing a functional configuration of a signal processing device 20 according to this embodiment.

[0048] 2, the signal processing device 20 includes a signal acquiring unit 21, a signal processing unit 22, a first amplifier 23, and a second amplifier 24. The signal processing device 20 includes a processor and a memory. The memory is a ROM (Read Only Memory) and a RAM (Random Access Memory), and can store a program executed by the processor. The signal acquiring unit 21, the signal processing unit 22, the first amplifier 23, and the second amplifier 24 are realized by a processor that executes a program stored in the memory.

[0049] The signal acquiring unit 21 acquires sound source data from the wireless device 10A or the external device 10B. The signal acquiring unit 21 may acquire the sound source data from a storage unit (not shown) included in the signal processing device 20.

[0050] The signal processing unit 22 generates an ultrasonic signal for ultrasonic waves and a low-frequency signal for low-frequency vibration based on the sound source data acquired by the signal acquisition unit 21. The signal processing unit 22 includes an ultrasonic generation unit 121 that generates an ultrasonic signal for ultrasonic waves based on the sound source data, and a low-frequency generation unit 122 that generates a low-frequency signal for low-frequency vibration based on the sound source data.

[0051] The ultrasound generating unit 121 includes, for example, a high-pass filter. The ultrasound generating unit 121 is realized by including, for example, a digital filter, but may be realized by including an analog filter.

[0052] The low-frequency generating unit 122 includes, for example, a low-pass filter. The low-frequency generating unit 122 is realized by including, for example, a digital filter, but may also be realized by including an analog filter.

[0053] A method for generating an ultrasonic signal by the ultrasonic generating section 121 and a method for generating a low-frequency signal by the low-frequency generating section 122 will be described later with reference to FIGS. 6A and 6B.

[0054] The first amplifier 23 causes the tweeters (first tweeter 230 and second tweeter 240) to output ultrasonic waves based on the ultrasonic signal. The first amplifier 23 amplifies the ultrasonic signal and outputs the amplified signal to the first tweeter 230 and the second tweeter 240, thereby causing the first tweeter 230 and the second tweeter 240 to output ultrasonic waves. The first amplifier 23 functions as an output section.

[0055] The second amplifier 24 outputs a sound based on the low-frequency signal to the vibration actuators (first vibration actuator 130 and second vibration actuator 140). The second amplifier 24 amplifies the low-frequency signal and outputs the amplified signal to the first vibration actuator 130 and second vibration actuator 140, causing the first vibration actuator 130 and second vibration actuator 140 to output low-frequency vibration. The second amplifier 24 functions as an output section.

[0056] Referring back to FIG. 1, the first speaker 30 includes a first vibration actuator 130 and a first tweeter 230 .

[0057] The first vibration actuator 130 outputs low-frequency vibration based on a low-frequency signal. The first vibration actuator 130 does not include a diaphragm (cone paper), and generates sound by applying vibration to a fixed vibration surface (for example, the first vibration surface S1 shown in FIG. 3). The first vibration actuator 130 is also called an exciter. The first vibration actuator 130 outputs, for example, gamma waves (for example, 40 Hz). The first vibration actuator 130 outputs, for example, sounds (low-frequency vibrations) mainly in the band of 40 Hz to 90 Hz.

[0058] The first vibration actuator 130 may also be capable of outputting sounds in the 90 Hz to 120 kHz frequency band. Even if the first vibration actuator 130 is capable of outputting sounds in the high-pitched range of 20 kHz or more, the sound pressure level in the high-pitched range is lower than that of a tweeter, and is insufficient for outputting high-pitched sounds. The speaker system 1 may also include other vibration actuators or speakers capable of outputting sounds in the 90 Hz to 120 kHz frequency band.

[0059] The first vibration actuator 130 is composed of a coil and a magnetic circuit, and the coil is fixed to the first vibration surface S1. The first vibration actuator 130 vibrates the first vibration surface S1 by the coil moving relative to the magnetic circuit and vibrating. Note that the first vibration actuator 130 may have a magnetic circuit fixed to the first vibration surface S1. In this case, the first vibration actuator 130 vibrates the first vibration surface S1 by the magnetic circuit moving relative to the coil and vibrating.

[0060] The first vibration surface S1 is, for example, a rectangular plate-like member. The first vibration surface S1 is made of, for example, wood, resin, metal, etc. The first vibration actuator 130 is fixed to the first vibration surface S1 by double-sided tape or screws.

[0061] The first tweeter 230 outputs a high-pitched sound having a frequency equal to or higher than a predetermined frequency. The first tweeter 230 outputs, for example, a sound (ultrasound) mainly in a band of 20 kHz to 150 kHz. The high-pitched sound output by the first tweeter 230 may include at least an inaudible sound among an audible sound (for example, less than 20 kHz) and an inaudible sound higher than the audible range (for example, 20 kHz or higher). The high-pitched sound output by the first tweeter 230 may further include an audible sound. The first tweeter 230 may be capable of outputting a sound having an arbitrary frequency or higher among, for example, sounds equal to or higher than 15 kHz and lower than 20 kHz. For example, the first tweeter 230 may output a sound of 19 kHz or higher, a sound of 18 kHz or higher, a sound of 17 kHz or higher, a sound of 16 kHz or higher, or a sound of 15 kHz or higher.

[0062] In this way, the first speaker 30 is configured to be capable of reproducing sounds up to the ultrasonic range.

[0063] The second speaker 40 includes a second vibration actuator 140 and a second tweeter 240. The configuration of the second vibration actuator 140 is the same as that of the first vibration actuator 130, and the configuration of the second tweeter 240 is the same as that of the first tweeter 230, so a description thereof will be omitted.

[0064] Here, the arrangement of the vibration actuator and the tweeter will be described with reference to Fig. 3. Fig. 3 is a diagram showing the configuration (arrangement) of the first speaker 30 according to this embodiment. Note that the first speaker 30 and the second speaker 40 have the same configuration, and the first speaker 30 will be taken as an example for description.

[0065] As shown in Fig. 3, in the first speaker 30, the first tweeter 230 is disposed on the first vibration actuator 130. That is, the first tweeter 230 and the first vibration actuator 130 are disposed so as to overlap in a plan view. The first tweeter 230 is disposed, for example, in the center of the first vibration actuator 130 when viewed from the axial direction of the first vibration actuator 130 (direction perpendicular to the paper surface). The first tweeter 230 and the first vibration actuator 130 may be disposed coaxially. Note that a plan view means a view from the axial direction of the first vibration actuator 130 (direction perpendicular to the paper surface in Fig. 3).

[0066] The first vibration actuator 130 has a vibration actuator part 131 that outputs low-frequency vibrations.

[0067] First tweeter 230 has tweeter section 231, piezoelectric element 232, diaphragm 233, horn 234, and lead wires 235. In this embodiment, first tweeter 230 has piezoelectric element 232 and is a so-called piezoelectric tweeter (piezoelectric tweeter).

[0068] The tweeter section 231 is an assembly member provided for mounting the first tweeter 230 to the first vibration actuator 130. The tweeter section 231 has a circular annular first portion and a connection portion that connects the first portion to the horn 234 and the diaphragm 233, etc., and the fastening member 132 is attached to the connection portion. In the example of Fig. 3, three connection portions are provided, but it is sufficient that at least two or more are provided. The fastening member 132 is, for example, a screw or a screw.

[0069] Piezoelectric element 232 is an element that expands and contracts in response to a change in applied voltage (accumulated charge), and is provided attached to diaphragm 233. Piezoelectric element 232 is, for example, attached to diaphragm 233. By supplying an ultrasonic signal to piezoelectric element 232, sound waves are emitted from piezoelectric element 232 via diaphragm 233.

[0070] The diaphragm 233 is a dome-shaped member that vibrates due to the piezoelectric element 232 in response to an input ultrasonic signal, generating sound waves. For example, the piezoelectric element 232 is attached to the diaphragm 233, and the diaphragm 233 vibrates based on the expansion and contraction of the piezoelectric element 232 due to a voltage applied to the piezoelectric element 232.

[0071] Horn 234 is arranged to increase the sound pressure output from diaphragm 233 and to control the directivity of the sound output from diaphragm 233. Horn 234 is formed in a cylindrical (cone-like) shape whose diameter gradually increases from tweeter section 231 toward the opposite side to vibration actuator section 131 in the axial direction.

[0072] Although the case where the piezoelectric element 232 is used as the vibration element of the first tweeter 230 has been described, the present invention is not limited to this, and may be configured as a voice coil using a small, high-performance magnet such as neodymium in the magnetic circuit.

[0073] The lead wire 235 connects the signal processing device 20 and an external electrode (not shown) of the piezoelectric element 232, and transmits an ultrasonic signal generated by the signal processing device 20 to the piezoelectric element 232. Since the lead wire 235 is thin and soft, by using the lead wire 235 for wiring connected to the piezoelectric element 232, the lead wire 235 and the piezoelectric element 232 can be easily electrically connected. Note that the wiring is not limited to the lead wire 235, and any wiring may be used as long as it can electrically connect the signal processing device 20 and the piezoelectric element 232. Also, the lead wire 235 may be connected in parallel to a terminal of the first vibration actuator 130.

[0074] The tweeter section 231 and the suspension of the first vibration actuator 130 may be fastened together to the first vibration actuator 130 using, for example, a fastening member 132. The suspension is, for example, an elastic body, and is disposed between the tweeter section 231 and the first vibration actuator 130 to suppress the vibration of the first vibration actuator 130 from being transmitted to the tweeter section 231. The elastic body may be, for example, rubber such as urethane rubber or synthetic rubber, but is not limited thereto, and may be an elastic body other than rubber.

[0075] Here, the characteristics of the speaker system 1 configured as above will be described with reference to Fig. 4. Fig. 4 is a diagram showing the characteristics of the first speaker 30 according to this embodiment. The characteristics of the second speaker 40 are the same as those of the first speaker 30, and a description thereof will be omitted. For convenience, Fig. 4 only shows sound pressure levels [dB SPL (Sound Pressure Level)] from 100 Hz to 100 kHz.

[0076] As shown in FIG. 4, the first speaker 30 has a first tweeter 230, and is therefore able to output sound in the ultrasonic range of 20 kHz to 100 kHz at a predetermined sound pressure level or higher, which would be difficult if the first speaker 30 only had the first vibration actuator 130.

[0077] Moreover, the sound pressure level between 20 kHz and 150 kHz at a position 1 m apart from the first tweeter 230 and the second tweeter 240 is, for example, 70 dB. 70 dB is, for example, an average value.

[0078] In this way, the speaker system 1 according to this embodiment can reproduce sounds up to the ultrasonic range. The speaker system 1 reproduces high-pitched sounds including the ultrasonic range by the first tweeter 230 and the second tweeter 240, and reproduces low-pitched sounds (low-frequency range) by the first vibration actuator 130 and the second vibration actuator 140.

[0079] The speaker system 1 configured as described above includes at least one of the first tweeter 230 and the second tweeter 240, and can thereby widen the reproduction band of high-pitched sounds compared to when the speaker system 1 includes only a vibration actuator. In other words, by including at least one of the first tweeter 230 and the second tweeter 240, a speaker system 1 with a wider reproduction band than conventional speaker systems can be realized. This improves the sound quality and the positioning of the sound image, and can further widen the sound field.

[0080] Although audio systems using a vibration actuator and a speaker have existed in the past, it is not easy to change the frequency characteristics, and it is difficult to reproduce high-pitched sounds. As a result, the reproduction band is narrow, and the sound quality and sound image positioning are not very good. The speaker system 1 according to this embodiment can solve these conventional problems because it is easy to reproduce high-pitched sounds using at least one of the first tweeter 230 and the second tweeter 240. In addition, it is expected to have the effect of improving the directionality of high-pitched sounds, the recognition of the direction of the sound, and the clarity of the sound.

[0081] [2. Speaker system operation] Next, the operation of the speaker system 1 configured as above will be described with reference to Fig. 5 to Fig. 6B. Fig. 5 is a flowchart showing the operation (signal processing method) of the speaker system 1 according to this embodiment. In Fig. 5, the operation of the signal processing device 20 included in the speaker system 1 will be mainly described.

[0082] As shown in Fig. 5, the signal acquiring unit 21 of the signal processing device 20 acquires sound source data (S10). The signal acquiring unit 21 acquires sound source data from, for example, at least one of the wireless device 10A and the external device 10B. If the acquired sound source data is sound source data recorded on a CD, it is 16-bit, two-channel data with a sampling frequency of 44.1 kHz. Although details will be described later, in step S23, frequency components of 20 kHz or higher are added to the sound source data acquired by the signal acquiring unit 21, but when the sampling frequency is 44.1 kHz, only frequency components up to half that frequency, 22.05 kHz, can be added.

[0083] Therefore, when acquiring sound source data from a CD, the signal acquisition unit 21 performs upsampling on the acquired sound source data. This makes it possible to generate, for example, sound source data (for example, high-resolution sound source) with a sampling frequency of 192 kHz, 24 to 32 bits, and two channels, and to add frequency components up to 96 kHz to the sound source data. Note that the signal acquisition unit 21 may directly acquire a high-resolution sound source or the like as sound source data, and in this case, the signal acquisition unit 21 does not need to perform upsampling. By playing the high-resolution sound source, the sound image can be effectively expanded.

[0084] Next, the signal processing unit 22 of the signal processing device 20 generates an ultrasonic signal for ultrasonic waves and a low-frequency signal for low-frequency vibration based on the sound source data (S20). The ultrasonic generation unit 121 of the signal processing unit 22 generates an ultrasonic signal for ultrasonic waves based on the sound source data, and the low-frequency generation unit 122 generates an ultrasonic signal for ultrasonic waves based on the sound source data.

[0085] Here, details of step S20 will be described with reference to Fig. 6A and Fig. 6B. Fig. 6A is a flowchart showing an operation of generating an ultrasound signal (a signal processing method) according to the present embodiment. Each process shown in Fig. 6A is executed by the ultrasound generation unit 121.

[0086] The ultrasound generating unit 121 controls the pitch (sound height) of the sound source data acquired by the signal acquiring unit 21 to n times (n is a real number greater than 1) (S21). By multiplying the pitch of the sound source data by n, the frequency components of the sound source data are shifted to the n times higher frequency side as a whole. The value of n is not particularly limited, but is set to a value such that the pitch-controlled sound source data includes frequency components of 20 kHz or more. For example, the ultrasound generating unit 121 may acquire the maximum frequency component included in the sound source data, and if the maximum frequency component is smaller than 20 kHz, set n to a value equal to or greater than the value obtained by dividing 20 kHz by the maximum frequency component. For example, n may be 2 to the power of m (m is an integer greater than or equal to 1). In other words, the ultrasound generating unit 121 may control the pitch of the acquired sound source data to 2 to the power of m (2 times, 4 times, 8 times, ..., etc.). In addition, the degree of the improvement effect of the mental and physical state obtained may differ depending on the value of m. Therefore, the signal processing device 20 may include an input unit that receives information indicating the degree of improvement effect on the mental and physical state that the user desires, and the ultrasound generating unit 121 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 effect that the user desires.

[0087] The ultrasonic wave generating unit 121 may control the sound pressure level in addition to the pitch. In this case, the ultrasonic wave generating unit 121 may increase or decrease the sound pressure level.

[0088] In the above, an example is described in which the value of n is set so that the pitch-controlled sound source data includes frequency components of 20 kHz or more, but the value of n may be set so that the sound source data includes frequency components of 15 kHz or more, for example. In other words, the value of n may be set so that frequency components in the audible range are included.

[0089] Next, the ultrasound generating unit 121 extracts frequency components of 20 kHz or more contained in the pitch-controlled sound source data (S22). The ultrasound generating unit 121 may extract frequency components of 40 kHz or more, for example, as frequency components of 20 kHz or more contained in the pitch-controlled sound source data, using a high-pass filter.

[0090] First, the ultrasound generating unit 121 may extract frequency components equal to or higher than a specific frequency (e.g., 4 kHz) included in the acquired sound source data, and multiply the extracted frequency components by n (e.g., 10 times). In this way, frequency components equal to or higher than 20 kHz can be extracted.

[0091] Next, the ultrasound generation unit 121 adds the frequency components extracted in step S22 to the sound source data acquired by the signal acquisition unit 21 in step S10 (S23). This makes it possible to generate sound source data (i.e., an ultrasound signal) including frequency components of 20 kHz or higher.

[0092] Next, the ultrasound generating unit 121 outputs sound source data (ultrasonic signal) to which the frequency components extracted in step S22 have been added (S24). For example, the ultrasound generating unit 121 outputs the sound source data to the first amplifier 23, but may also output the sound source data to a tweeter (first tweeter 230, second tweeter 240) or the like. This allows the user to hear the sound (music, environmental sound, etc.) indicated by the sound source data, and at the same time, obtain the hypersonic effect.

[0093] It is said that it is difficult to obtain the hypersonic effect with frequency components between 20kHz and 40kHz. Therefore, by extracting frequency components of 40kHz or more contained in the pitch-controlled sound source data, sound source data containing frequency components of 40kHz or more that are easy to obtain the hypersonic effect can be generated. In other words, from the viewpoint of effectively obtaining the hypersonic effect, it is preferable that frequency components of 40kHz or more are extracted in step S22.

[0094] Next, the generation of a low-frequency signal will be described with reference to Fig. 6B. Fig. 6B is a flowchart showing the operation of generating a low-frequency signal (signal processing method) according to the present embodiment. Each process shown in Fig. 6B is executed by the low-frequency generating unit 122.

[0095] The low-frequency generating unit 122 controls the pitch (sound height) of the sound source data acquired by the signal acquiring unit 21 to 1 / l (l is a real number greater than 1) times (S25). By multiplying the pitch of the sound source data by 1 / l, the frequency components of the sound source data are shifted to the lower frequency side by 1 / l times as a whole. The value of l is not particularly limited, but is set to a value such that the pitch-controlled sound source data includes frequency components of 90 Hz or less. For example, the low-frequency generating unit 122 may acquire the minimum frequency component included in the sound source data, and if the minimum frequency component is greater than 90 Hz, set 1 / l to a value equal to or less than the value obtained by dividing 90 Hz by the minimum frequency component. For example, l may be the kth power of 2 (k is an integer greater than or equal to 1). In other words, the low-frequency generating unit 122 may control the pitch of the acquired sound source data to 1 / kth power of 2 (1 / 2, 1 / 4, 1 / 8, ..., etc.). Also, the degree of improvement effect of the mental and physical state obtained may differ depending on the value of k. Therefore, the signal processing device 20 may include an input unit that receives information indicating the degree of improvement effect of the mental and physical state that the user desires to obtain, and the low-frequency generating unit 122 may control the value of k according to the information received by the input unit. This allows the user to obtain the degree of improvement effect that the user desires.

[0096] The low-frequency generation unit 122 may control the sound pressure level in addition to the pitch. In this case, the low-frequency generation unit 122 may increase or decrease the sound pressure level.

[0097] Next, the low-frequency generation unit 122 extracts frequency components of 90 Hz or less contained in the pitch-controlled sound source data (S26). The low-frequency generation unit 122 may extract frequency components of 70 Hz or less, for example, as frequency components of 90 Hz or less contained in the pitch-controlled sound source data, using a low-pass filter.

[0098] First, the low-frequency generating unit 122 may extract frequency components below a specific frequency (e.g., 800 Hz) included in the acquired sound source data, and multiply the extracted frequency components by 1 / 1 (e.g., 1 / 10). In this way, frequency components below 90 Hz can also be extracted.

[0099] Next, the low-frequency generation unit 122 adds the frequency components extracted in step S26 to the sound source data acquired by the signal acquisition unit 21 in step S10 (S27). This makes it possible to generate sound source data including frequency components of 90 Hz or less (i.e., a low-frequency signal). For example, even if the sound pressure level of the frequency components of 90 Hz or less is not sufficient in the sound source data acquired in step S10, the low-frequency generation unit 122 can perform the above processing to generate sound source data adjusted so that the sound pressure level of the frequency components of 90 Hz or less is sufficient.

[0100] Next, the low-frequency generating unit 122 outputs sound source data (low-frequency signal) to which the frequency components extracted in step S26 have been added (S28). For example, the low-frequency generating unit 122 outputs the sound source data to the second amplifier 24, but may also output the sound source data to a vibration actuator (first vibration actuator 130, second vibration actuator 140), etc. This allows the user to hear the sound (music, environmental sound, etc.) indicated by the sound source data.

[0101] 5 again, next, the signal processing device 20 amplifies each of the ultrasonic signal for the ultrasonic wave and the low-frequency signal for the low-frequency vibration (S30). Specifically, the first amplifier 23 amplifies the ultrasonic signal, and the second amplifier 24 amplifies the low-frequency signal.

[0102] Next, the speaker system 1 outputs ultrasonic waves and low-frequency vibrations (S40). Specifically, the first amplifier 23 outputs the amplified ultrasonic signal to the first tweeter 230 and the second tweeter 240, and the second amplifier 24 outputs the amplified low-frequency signal to the first vibration actuator 130 and the second vibration actuator 140. Then, the first tweeter 230 and the second tweeter 240 output ultrasonic waves based on the acquired ultrasonic signal, and the first vibration actuator 130 and the second vibration actuator 140 output low-frequency vibrations based on the acquired low-frequency signal.

[0103] The signal processing device 20 that operates as described above uses its own signal processing to generate an ultrasonic signal of, for example, 20 kHz or more by the ultrasonic generating unit 121, so that the treble band of the signal output from the signal processing device 20 can be widened compared to the case where the ultrasonic signal is not generated. By reproducing such a signal by the speaker, the reproduction band of the treble band of the sound output from the speaker can be widened. This improves the sound quality and the positioning of the sound image, and further widens the sound field. In addition, the signal processing device 20 can easily reproduce the treble band by at least one of the first tweeter 230 and the second tweeter 240, so that the conventional problems described above can be solved.

[0104] Furthermore, the signal processing device 20 that operates as described above uses its own signal processing to generate a low-frequency signal of, for example, 90 Hz or less by the low-frequency generating unit 122, so that the low-frequency band of the signal output from the signal processing device 20 can be broadened compared to a case where the low-frequency signal is not generated. By reproducing such a signal by a speaker, the reproduction band of the low-frequency band of the sound output from the speaker can be broadened. This improves the sound quality and the positioning of the sound image, and further widens the sound field.

[0105] (First Modification of the Embodiment) The speaker system according to this modification will be described below with reference to FIG. 7. The following description will focus on the differences from the embodiment, and the description of the same or similar contents as the embodiment will be omitted or simplified. FIG. 7 is a diagram showing the configuration of a speaker (first speaker 30a) according to this modification. The first speaker 30a according to this modification differs from the first speaker 30 according to the embodiment in the arrangement positions of the vibration actuator and tweeter. Although FIG. 7 shows the first speaker 30a as a speaker, the configuration of a second speaker (not shown) may also be the same as that of the first speaker 30a.

[0106] 7, in the first speaker 30a, the first tweeter 230 is disposed beside the first vibration actuator 130. In other words, the first tweeter 230 and the first vibration actuator 130 are disposed side by side in a plan view.

[0107] The first tweeter 230 and the housing of the first vibration actuator 130 may be a single-piece molded product. Also, the first tweeter 230 and parts of the first vibration actuator 130 may be assembled into a single-piece molded product. Also, the lead wires 235 may be connected in parallel to the terminals of the first vibration actuator 130.

[0108] (Modification 2 of the embodiment) The speaker system according to this modification will be described below with reference to Figs. 8 and 9. The following description will focus on the differences from the embodiment, and description of the same or similar content as the embodiment will be omitted or simplified. Fig. 8 is a diagram showing the configuration of a speaker system 1 according to this modification. The speaker system 1 according to this modification differs from the speaker system 1 according to the embodiment in that it further includes a first sub-vibration actuator 50 and a second sub-vibration actuator 60.

[0109] As shown in Figure 8, the speaker system 1 of this modified example includes, in addition to the speaker system 1 of the embodiment, a first sub-vibration actuator 50 that is fixed to a second vibration surface (for example, the second vibration surface S2 shown in Figure 9, etc.) and imparts vibration to the second vibration surface S2 to produce sound, and a second sub-vibration actuator 60 that is fixed to a third vibration surface (for example, the third vibration surface S3 shown in Figure 9, etc.) and imparts vibration to the third vibration surface S3 to produce sound.

[0110] The first sub vibration actuator 50 and the second sub vibration actuator 60 output low-frequency vibration. The first sub vibration actuator 50 and the second sub vibration actuator 60 may output low-frequency vibration in synchronization with the output of the first vibration actuator 130 and the second vibration actuator 140.

[0111] The first sub vibration actuator 50 and the second sub vibration actuator 60 do not have a diaphragm (cone paper), and generate sound by applying vibration to fixed vibration surfaces (second vibration surface S2 and third vibration surface S3). The first sub vibration actuator 50 and the second sub vibration actuator 60 are also called exciters. The first sub vibration actuator 50 and the second sub vibration actuator 60 output sounds (low frequency vibrations) mainly in the band of 40 Hz to 90 Hz, for example. The first sub vibration actuator 50 and the second sub vibration actuator 60 may have a configuration similar to that of the first vibration actuator 130, for example. The first sub vibration actuator 50 and the second sub vibration actuator 60 are not provided with tweeters.

[0112] The second vibration surface S2 and the third vibration surface S3 may be the same vibration surface (vibration surfaces at different positions on the same member) or may be different vibration surfaces. In addition, the second vibration surface S2 and the third vibration surface S3 may be the same vibration surface as the first vibration surface S1 or may be different vibration surfaces.

[0113] The low-frequency generating section 122 of the signal processing device 20 may further generate a low-frequency signal to be output to the first sub-vibration actuator 50 and the second sub-vibration actuator 60. The method of generating the low-frequency signal may be, for example, the same as the method shown in FIG.

[0114] Here, an example of installation of the first sub vibration actuator 50 and the second sub vibration actuator 60 will be described with reference to FIG. 9. FIG. 9 is a diagram showing an example of installation of the first sub vibration actuator 50 and the second sub vibration actuator 60 according to this modified example. FIG. 9 illustrates an example in which the first sub vibration actuator 50 and the second sub vibration actuator 60 are provided on a cushion body 110 for a car seat 100 provided in a vehicle. A certain range including a part of the cushion body 110 that contacts the first sub vibration actuator 50 is the second vibration surface S2, and a certain range including a part of the cushion body 110 that contacts the second sub vibration actuator 60 is the third vibration surface S3. The first sub vibration actuator 50 and the second sub vibration actuator 60 may be embedded in the car seat 100.

[0115] As shown in FIG. 9, the first sub-vibration actuator 50 and the second sub-vibration actuator 60 are provided on a cushion body 110 for a vehicle seat 100. As shown in FIG.

[0116] The cushion body 110 is a so-called lumbar support that comes into contact with the lower back of a person who sits on it. The cushion body 110 comes into contact with the lower back of a person who is seated.

[0117] The first sub vibration actuator 50 and the second sub vibration actuator 60 output low frequency vibrations toward the person's lower back. The first sub vibration actuator 50 and the second sub vibration actuator 60 output sounds (low frequency vibrations) in the band of, for example, 40 Hz to 90 Hz.

[0118] The first sub vibration actuator 50 and the second sub vibration actuator 60 are not limited to being provided so as to come into contact with the lower back, and may be provided so as to come into contact with at least one of the buttocks and thighs of a person when the person sits or lies down. The first sub vibration actuator 50 and the second sub vibration actuator 60 may be provided on a cushion body arranged on the seat surface of the vehicle seat 100, or embedded in the seat surface, and configured to output low-frequency vibrations toward the buttocks and thighs of the person.

[0119] According to this, since low-frequency vibration can be output toward at least one of the lower back, buttocks, and thighs of a person, the vibration can be felt by the body, adding a low-frequency sensation. In addition, the low-frequency vibration can more effectively improve the blood flow of a person.

[0120] The first sub-vibration actuator 50 and the second sub-vibration actuator 60 may be provided so as to come into contact with a person's back when the person sits or lies down.

[0121] (Examples) The speaker system 1 shown in the above embodiment and each modified example is arranged in a vehicle such as a car, an airplane, a ship, etc. For example, the speaker system 1 may be a seat arranged in the vehicle. Note that the speaker system 1 is not limited to a seat arranged in the interior of the vehicle, but may be a seat arranged in a movie theater, a theater, or a conference room, or may be a chair with a cushion, a seat chair, a sofa, a massage chair, etc.

[0122] In the following, application examples of the speaker system 1 will be described with reference to Figs. 10 to 13. Figs. 10 to 13 are diagrams showing application examples of the speaker system 1 according to the embodiment and the like. Figs. 10 to 13 are schematic diagrams showing the arrangement of the tweeter and vibration actuator of the speaker system 1. Fig. 11(a) is a diagram showing an instrument panel of a vehicle, and Fig. 11(b) is a diagram showing a front seat viewed from above and below. Fig. 11(b) shows the backrest and seat surface of the driver's seat and passenger's seat. In Figs. 10 to 13, the surface (portion) to which the vibration actuator is attached is an example of a vibration surface (first vibration surface S1, second vibration surface S2, or third vibration surface S3).

[0123] 10 and 11, the speaker system 1 may be provided in a vehicle. In the speaker system 1, the first speaker 30 and the second speaker 40 may be provided in the upper part of the instrument panel (e.g., both ends of the upper part), and the first sub vibration actuator 50 and the second sub vibration actuator 60 may be provided below the first speaker 30 and the second speaker 40. The upper part of the instrument panel may be, for example, the top surface of the instrument panel, or may be a position above a predetermined structure (e.g., a cup holder) provided on the instrument panel.

[0124] The first speaker 30 and the second speaker 40 are provided, for example, so as to output sound from the front side of a seated person.

[0125] In this case, the instrument panel is the first vibration surface S1.

[0126] 10, the first sub vibration actuator 50 and the second sub vibration actuator 60 may be provided at the bottom of the center console. In this case, a certain area of ​​the bottom of the center console including a portion in contact with the first sub vibration actuator 50 is the second vibration surface S2, and a certain area including a portion in contact with the second sub vibration actuator 60 is the third vibration surface S3.

[0127] 11, the first sub vibration actuator 50 and the second sub vibration actuator 60 may be provided between the driver's seat and the passenger seat (for example, on the floor under the front seat). In this case, of the floor under the front seat, a certain area including a portion in contact with the first sub vibration actuator 50 is the second vibration surface S2, and a certain area including a portion in contact with the second sub vibration actuator 60 is the third vibration surface S3.

[0128] The first sub vibration actuator 50 and the second sub vibration actuator 60 may be provided in a position on the instrument panel lower than the first speaker 30 and the second speaker 40 (for example, on a side of a cup holder provided on the instrument panel). The first sub vibration actuator 50 and the second sub vibration actuator 60 may be provided on a B-pillar (for example, a lower part of the B-pillar), which is a pillar between the front seat and the rear seat, or on a lumbar support of the driver's seat (for example, see FIG. 9).

[0129] The first speaker 30 and the second speaker 40 may be provided at a position other than the instrument panel.

[0130] As described above, by providing the speaker system 1 with a tweeter, the sound field becomes wider, so that it becomes possible to mount a vibration actuator in a position where mounting was not possible in the past. In other words, the degree of freedom in the mounting positions of the tweeter and vibration actuator is improved.

[0131] As shown in FIGS. 12 and 13, the speaker system 1 may be installed in a home, an office, or the like.

[0132] As shown in Fig. 12, the first speaker 30 and the second speaker 40 may be provided on a desk used at home or in an office. The first speaker 30 and the second speaker 40 are arranged, for example, on the desk at a predetermined distance apart. Although not shown, the first sub vibration actuator 50 and the second sub vibration actuator 60 may be embedded in a chair or provided on a lumbar support used in the chair. In this case, the top plate of the desk is the first vibration surface S1.

[0133] 13, the first speaker 30 and the second speaker 40 may be provided on either side of the headboard of the bed. In this case, the headboard is the first vibration surface S1.

[0134] (Other embodiments) Although the speaker system 1 according to one or more aspects has been described above based on the embodiment, the present disclosure is not limited to the embodiment. As long as it does not deviate from the spirit of the present disclosure, various modifications conceived by a person skilled in the art to the present embodiment and forms constructed by combining components in different embodiments may also be included in the present disclosure.

[0135] For example, each speaker and each sub vibration actuator of the speaker system 1 according to the above embodiment and the like may be embedded in a structure in advance, or may be attached to the structure later.

[0136] In addition, in the above embodiment and the like, an example has been described in which the first vibration actuator 130 and the first tweeter 230 are provided integrally as the first speaker 30, but the first vibration actuator 130 and the first tweeter 230 may be arranged, for example, spaced apart.

[0137] Furthermore, the number of speakers having vibration actuators and tweeters included in the speaker system 1 according to the above-described embodiment and the like is not particularly limited as long as it is at least 1. The speaker system 1 may include only one speaker, or may include three or more speakers.

[0138] In addition, the method of generating the ultrasonic signal and the low-frequency signal described in the above embodiment is an example, and is not limited to the above method. As long as the ultrasonic signal and the low-frequency signal described above can be generated, the ultrasonic signal and the low-frequency signal may be generated by a method other than the above.

[0139] In the above embodiments, each component may be implemented by dedicated hardware or by executing a software program suitable for each component. Each component may be implemented by a program execution unit such as a CPU (Central Processing Unit) or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.

[0140] In addition, the order in which each step is performed in the flowchart is merely an example for specifically explaining the present disclosure, and an order other than the above may be used. In addition, some of the steps may be performed simultaneously (in parallel) with other steps, or some of the steps may not be performed.

[0141] In addition, the division of functional blocks in the block diagram is an example, and multiple functional blocks may be realized as one functional block, one functional block may be divided into multiple blocks, or some functions may be transferred to another functional block. Furthermore, the functions of multiple functional blocks having similar functions may be processed in parallel or in a time-sharing manner by a single piece of hardware or software.

[0142] Furthermore, the signal processing device 20 according to the above-mentioned embodiments and the like may be realized as a single device, or may be realized by multiple devices. When the signal processing device 20 is realized by multiple devices, the components of the signal processing device 20 may be distributed in any manner among the multiple devices. When the signal processing device 20 is realized by multiple devices, the communication method between the multiple devices is not particularly limited, and may be wireless communication or wired communication. Furthermore, wireless communication and wired communication may be combined between the devices.

[0143] Moreover, each of the components described in the above embodiments may be realized as software, or may be realized as an LSI, which is typically an integrated circuit. These may be individually integrated into one chip, or may be integrated into one chip to include some or all of them. Here, LSI is used, but it may be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration. Furthermore, the method of integration is not limited to LSI, and may be realized by a dedicated circuit (a general-purpose circuit that executes a dedicated program) or a general-purpose processor. After LSI manufacture, a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor that can reconfigure the connection or settings of circuit cells inside the LSI may be used. Furthermore, if an integrated circuit technology that replaces LSI appears due to the progress of semiconductor technology or a different derived technology, it is natural that the components may be integrated using that technology.

[0144] A system LSI is an ultra-multifunctional LSI manufactured by integrating multiple processing units on a single chip, and specifically, is a computer system that includes a microprocessor, ROM, RAM, etc. Computer programs are stored in the ROM. The system LSI achieves its functions by the microprocessor operating in accordance with the computer program.

[0145] Furthermore, one aspect of the present disclosure may be a computer program that causes a computer to execute each of the characteristic steps included in the signal processing method shown in any one of FIG. 5, FIG. 6A, and FIG. 6B.

[0146] Also, for example, the program may be a program to be executed by a computer. Also, one aspect of the present disclosure may be a computer-readable non-transitory recording medium on which such a program is recorded. For example, such a program may be recorded on a recording medium and distributed or circulated. For example, the distributed program may be installed in a device having another processor, and the program may be executed by the processor, thereby making it possible to cause the device to perform each of the above processes. [Industrial Applicability]

[0147] The present disclosure is useful for speaker systems and the like that reproduce sound. [Explanation of symbols]

[0148] 1 Speaker System 10A wireless equipment 10B External equipment 20 Signal Processing Device 21 Signal acquisition unit 22 Signal Processing Section 23 First Amplifier 24 2nd Amplifier 30, 30a 1st speaker 40 2nd Speaker 50 First sub vibration actuator 60 Second sub vibration actuator 100 car seats 110 Cushion body 121 Ultrasonic generator 122 Low frequency generator 130 First vibration actuator 131 Vibration actuator part 132 Fastening members 140 Second vibration actuator 230 First Tweeter 231 Tweeter Section 232 Piezoelectric element 233 Diaphragm 234 Horn 235 Lead Wire 240 Second Tweeter S1 First Oscillation Plane S2 Second Oscillation Plane S3 Third Oscillation Plane

Claims

1. a vibration actuator fixed to a first vibration surface and applying vibration to the first vibration surface to generate sound; A tweeter that outputs high-pitched sounds. Speaker system.

2. moreover, a first sub vibration actuator fixed to a second vibration surface and configured to apply vibration to the second vibration surface to generate sound; a second sub-vibration actuator that is fixed to a third vibration surface and applies vibration to the third vibration surface to generate sound; 2. The speaker system according to claim 1.

3. the first sub-vibration actuator and the second sub-vibration actuator are provided on a cushion body with which a lower back of a person comes into contact when the person sits on the cushion body, The first sub vibration actuator and the second sub vibration actuator output a sound toward the lower back.

3. The speaker system according to claim 2.

4. The tweeter is disposed so as to overlap the vibration actuator when viewed in the axial direction of the vibration actuator.

4. The speaker system according to claim 1, wherein the first and second components are arranged in a first direction.

5. The tweeter is disposed alongside the vibration actuator when viewed in the axial direction of the vibration actuator.

4. The speaker system according to claim 1, wherein the first and second components are arranged in a first direction.

6. The high-pitched sound output by the tweeter includes at least an audible sound and an inaudible sound higher than the audible range.

4. The speaker system according to claim 1, wherein the first and second components are arranged in a first direction.

7. The high-pitched sound output by the tweeter further includes the audible sound.

7. A speaker system according to claim 6.

8. A signal acquisition unit that acquires sound source data; an ultrasonic generating unit that generates an ultrasonic signal for ultrasonic waves based on the acquired sound source data; a low-frequency generating unit that generates a low-frequency signal for low-frequency vibration based on the acquired sound source data, The ultrasonic wave generating unit includes: Controlling the pitch of the acquired sound source data by a factor of n (n is a real number greater than 1); Extracting a first frequency component of 20 kHz or more contained in the pitch-controlled sound source data; generating the ultrasonic signal by adding the extracted first frequency component to the acquired sound source data; The low frequency generating unit is The pitch of the acquired sound source data is controlled to 1 / l (l is a real number greater than 1), Extracting a second frequency component of 90 Hz or less from the pitch-controlled sound source data; The low-frequency signal is generated by adding the extracted second frequency component to the acquired sound source data. Signal processing device.

9. The speaker system according to any one of claims 1 to 3 further includes an output section that outputs the generated ultrasonic signal to a tweeter and outputs the generated low-frequency signal to a vibration actuator. The signal processing device according to claim 8.

10. Acquire the sound source data, generating an ultrasonic signal for ultrasonic waves based on the acquired sound source data; generating a low-frequency signal for low-frequency vibration based on the acquired sound source data; In generating the ultrasonic signal, Controlling the pitch of the acquired sound source data by a factor of n (n is a real number greater than 1); Extracting a first frequency component of 20 kHz or more contained in the pitch-controlled sound source data; generating the ultrasonic signal by adding the extracted first frequency component to the acquired sound source data; In generating the low frequency signal, The pitch of the acquired sound source data is controlled to 1 / l (l is a real number greater than 1), Extracting a second frequency component of 90 Hz or less from the pitch-controlled sound source data; The low-frequency signal is generated by adding the extracted second frequency component to the acquired sound source data. Signal processing methods.

Images