Sound system, sound system control method, and sound system manufacturing method

Abstract

A sound system, a sound system control method, and a sound system manufacturing method are provided. Propagation of sound is limited to an intended range. A sound system (100) includes a vibration member (110), one or more sound generating devices (121) that generate sound to the vibration member (110) based on a sound signal, one or more vibration exciters (122) that are installed to the vibration member (110) and apply vibration to the vibration member, a first signal output device (131) that outputs a first sound signal to the sound generating device, and a second signal output device (132) that outputs a second sound signal obtained by correcting the first sound signal in a manner to suppress propagation of sound in a non-propagation region (202) that is a region outside a region in which sound emitted from the sound generating device based on the first sound signal and passing through the vibration member (110) is intended to propagate.

Description

Technical Field

[0001] This disclosure relates to a sound system for defining the propagation area of ​​sound, a sound system control method, and a sound system manufacturing method. Background Technology

[0002] Patent Document 1 describes a sound system that, in the case of multiple speakers located in different positions such as the cabin of an airplane emitting different sounds, prevents the sound emitted from speakers other than the designated speaker from reaching a person sitting near the designated speaker.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 6958763 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] However, the sound system described in the aforementioned patent document 1 has room for improvement.

[0008] This disclosure provides a sound system, a sound system control method, and a sound system manufacturing method that enable further improvements.

[0009] Solution for solving the problem

[0010] The sound system disclosed herein includes: a vibrating member; one or more sound generating devices that generate sound directed toward the vibrating member based on a sound signal; one or more exciters mounted on the vibrating member and applying vibration to the vibrating member; a first signal output device that outputs a first sound signal to the sound generating device; and a second signal output device that outputs a second sound signal, obtained by correcting the first sound signal in a manner that suppresses the propagation of the sound in a non-propagation region outside the region where the sound is emitted from the sound generating device 121 based on the first sound signal and propagates through the vibrating member.

[0011] One of the sound system control methods disclosed herein is a sound system control method for setting the filter characteristics of a correction filter possessed by a sound system. The sound system includes: a vibrating member; one or more sound generating devices that generate sound directed toward the vibrating member based on a sound signal; one or more exciters mounted on the vibrating member and applying vibration to the vibrating member; a first signal output device that outputs a first sound signal to the sound generating devices; and a second signal output device that outputs a second sound signal obtained by correcting the first sound signal in a manner that suppresses the propagation of the sound in a region outside the region intended to allow the sound emitted from the vibrating member based on the first sound signal to propagate, i.e., a non-propagation region, to the exciters. The second signal output device is equipped with the function of transmitting the first sound signal... The correction filter, after correction, is output to the exciter. The correction filter has filter characteristics derived from the transmission characteristics of the sound emitted by the sound generating device and propagated through the vibrating member. In the sound system control method, a measuring device is configured at one or more locations in the non-propagation area. The filter characteristics of the correction filter are set based on a first sound pressure transfer function between a first measuring signal and the first sound signal, and a second sound pressure transfer function between a second measuring signal and the second sound signal. The first measuring signal is a signal obtained by the measuring device from the sound emitted by the sound generating device and propagated through the vibrating member based on the first sound signal. The second measuring signal is a signal obtained by the measuring device from the sound emitted from the vibrating member by the excitation force generated by the exciter based on the second sound signal.

[0012] One of the methods disclosed herein is a sound system manufacturing method for manufacturing a sound system by setting the filter characteristics of a correction filter possessed by the sound system. The sound system includes: a vibrating member; one or more sound generating devices that generate sound directed toward the vibrating member based on a sound signal; one or more exciters mounted on the vibrating member and applying vibration to the vibrating member; a first signal output device that outputs a first sound signal to the sound generating devices; and a second signal output device that outputs a second sound signal obtained by correcting the first sound signal in a manner that suppresses the propagation of the sound in a region outside the region where the sound emitted from the vibrating member based on the first sound signal is intended to propagate, i.e., a non-propagation region, to the exciters. The second signal output device includes the function of transmitting the first sound signal... A correction filter, after sound signal correction, is output to the exciter. The correction filter has filter characteristics derived from the transmission characteristics of sound emitted by the sound generating device and propagated through the vibrating member. In the sound system manufacturing method, a measuring device is disposed at one or more locations in the non-propagation area. The filter characteristics of the correction filter are set based on a first sound pressure transfer function between a first measuring signal and the first sound signal, and a second sound pressure transfer function between a second measuring signal and the second sound signal. The first measuring signal is a signal obtained by the measuring device from the sound emitted from the vibrating member by the excitation force generated by the sound generating device based on the first sound signal. The second measuring signal is a signal obtained by the measuring device from the sound emitted from the vibrating member by the excitation force generated by the exciter based on the second sound signal.

[0013] The effects of the invention

[0014] Further improvements can be achieved based on the sound system, sound system control method, and sound system manufacturing method disclosed herein. Attached Figure Description

[0015] Figure 1 It is a three-dimensional diagram showing the sound system.

[0016] Figure 2 This is a perspective view showing a portion of the housing of the sound system, omitting that part of it.

[0017] Figure 3 This is a diagram showing the functional structure of a sound system.

[0018] Figure 4 This is a diagram illustrating the characteristic fabrication system of the first measurement method.

[0019] Figure 5This is a diagram illustrating the characteristic fabrication system for the second measurement method.

[0020] Figure 6 This is a diagram illustrating the characteristic fabrication system for the third measurement method.

[0021] Figure 7 This is a perspective view showing another example 1 of a sound system.

[0022] Figure 8 This is a perspective view of another example 2 of the sound system, omitting a portion of the housing. Detailed Implementation

[0023] Hereinafter, embodiments of the sound system, sound system control method, and sound system manufacturing method involved in this disclosure will be described with reference to the accompanying drawings. Furthermore, the following embodiments are illustrative examples provided to illustrate this disclosure and are not intended to limit the scope of this disclosure. For example, the shapes, structures, materials, constituent elements, relative positional relationships, connection states, numerical values, formulas, the content of each stage in the method, and the order of each stage shown in the following embodiments are examples, and sometimes include content not described below. Additionally, geometric expressions such as parallel and orthogonal are sometimes used, but these expressions are not mathematically rigorous and include substantially permissible errors and deviations. Furthermore, expressions such as simultaneous and identical also include substantially permissible ranges.

[0024] In addition, the accompanying drawings are schematic diagrams that have been appropriately emphasized, omitted or adjusted in proportion for the purpose of illustrating this disclosure, and differ from the actual shapes, positional relationships and proportions.

[0025] Furthermore, several inventions may be described in general terms as a single embodiment in the following description. Additionally, a portion of the content described below is described as any constituent element relating to this disclosure.

[0026] Figure 1 This is a three-dimensional view showing the sound system 100. Figure 2 This is a perspective view showing a portion of the housing 140 of the sound system 100, omitting that part is missing. Figure 3 This is a diagram illustrating the functional structure of the sound system 100. The sound system 100 is capable of propagating in the propagation region 201 (see reference). Figure 3 The system 100, which transmits sound within a region 201 and suppresses sound propagation in a non-propagation region 202 outside the propagation region 201, includes a vibrating member 110, a sound generating device 121, an exciter 122, a first signal output device 131, and a second signal output device 132. In this embodiment, the sound system 100 includes a housing 140 and a fixing member 150.

[0027] The vibrating member 110 is a member that is vibrated by the sound generating device 121. The material and shape of the vibrating member 110 are not limited. For example, the vibrating member 110 can be exemplified as a rectangular plate-shaped member made of metal, resin, or wood. In this embodiment, the vibrating member 110 is formed of a plate-shaped member such that the propagation speed of the flexural wave propagating in the vibrating member 110 within the frequency range of the sound contained in the first sound signal reproduced by the sound system 100 does not exceed the speed of sound of air at room temperature. That is, the flexural stiffness B and distributed mass M of the vibrating member 110 are adjusted such that the propagation speed Cp of the flexural wave generated by the vibrating member 110 is slower than the speed of sound of air Cair ≈ 340 m / s in the vibration frequency range of the vibration applied by the first exciter 121 within the propagation region 201. Therefore, non-traveling waves that do not propagate to the non-propagation region 202 can be easily generated in the propagation region 201 near the vibrating member 110 by the operation of the first exciter 121 and the second exciter 122. Furthermore, the vibrating member 110 is preferably a plate material with a constant distribution of Young's modulus E, material density ρ, Poisson's ratio ν, and thickness h. The vibrating member 110 is held in the shell 140 by closing the opening of the rectangular box-shaped shell 140, thus creating a sealed space inside the shell 140. Regarding the thickness h of the vibrating member 110, for the Young's modulus E, material density ρ, and Poisson's ratio ν of the vibrating member 110, the bending stiffness B and the distributed mass M=ρh are adjusted under the first condition so that the bending wave propagation speed Cp is slower than the speed of sound in air Cair≈340m / s at f=20kHz, which is the fastest in the audible frequency range.

[0028] Furthermore, the propagation velocity Cp of the curved wave is obtained by Equation 1 below.

[0029]

[0030] The first condition is that the following equation 2 is satisfied.

[0031]

[0032] The bending stiffness B is obtained by the following equation 3.

[0033]

[0034] ^ represents exponentiation. / represents multiplication, / represents division, + represents addition, and - represents subtraction.

[0035] The sound generating device 121 is a device that generates sound directed towards the vibrating member 110 based on a first sound signal. The sound system 100 may also include one or more sound generating devices 121. The type of sound generating device 121 is not limited. For example, the sound generating device 121 can include a speaker unit, a sound generating exciter that vibrates an object to produce sound, etc. Furthermore, the sound generating device 121 may also include a speaker enclosure (cabinet) housing the speaker unit, a vibrating member that mounts the sound generating exciter, etc. Additionally, the sound generating device 121 may include multiple speaker units, multiple sound generating exciters, or it may be a multi-channel speaker with multiple speaker units. In this embodiment, the sound generating device 121 is a sealed speaker with a speaker enclosure that houses the back of the speaker unit in a sealed state. The sound generating device 121 is arranged inside the housing 140.

[0036] The exciter 122 is mounted on the vibrating member 110 and is an actuator (exciter) that applies vibration to the vibrating member 110 by means of an excitation force generated based on a second sound signal. The exciter 122 may be the same type as an exciter used in the case of the sound generating device 121, or it may be a different type. The exciter 122 includes a second movable part 125 connected to the vibrating member 110, a second base 126, and a vibration unit (not shown) that generates an excitation force between the second movable part 125 and the second base 126. The type of vibration unit of the exciter 122 is not limited, and examples include a vibration unit using a magnet, a vibration unit using a piezoelectric element, a vibration unit using a magnetostrictive element, etc. Examples of the exciter 122 include exciters that use inertial forces generated by the mass effect of the second base 126, and exciters that use structural reaction forces generated by connecting one end of the second base 126 to other structural members, etc. Furthermore, the sound system 100 may include one exciter 122 or multiple exciters 122. The mounting position of the exciter 122 is not limited. In this embodiment, the exciter 122 is mounted on a first surface of the vibrating member 110 opposite to the second surface on which the sound generating device 121 is mounted. The sound system 100 has one exciter 122 at the center of the vibrating member 110.

[0037] The first signal output device 131 is a device that outputs a first sound signal to the sound generating device 121. The first signal output device 131 is not limited; in this embodiment, it includes a first driver amplifier 133. The first driver amplifier 133 is an amplifier that amplifies the first sound signal output from the signal source 200 until it can drive the sound generating device 121 to emit sound from the vibrating member 110. Furthermore, the first signal output device 131 may also include any filter such as a delay filter or a correction filter.

[0038] The second signal output device 132 is a device that outputs a second sound signal, obtained by correcting the first sound signal in a manner that suppresses sound propagation in the non-propagation region 202, outside the propagation region 201 where the sound, based on the first sound signal emitted from the sound generating device 121 and passing through the vibrating member 110, propagates through the air. The second signal output device 132 is not limited; in this embodiment, it includes a second drive amplifier 134. The second drive amplifier 134 amplifies the second sound signal obtained by driving the vibrating member 110 to vibrate and correcting the sound propagation into the non-propagation region 202. In this embodiment, the second drive amplifier 134 amplifies the second sound signal corrected by the correction filter 135.

[0039] The correction filter 135 is a filter that outputs a second sound signal to the exciter 122. This second sound signal is a signal obtained by correcting the first sound signal in a manner that allows the sound to propagate within a propagation region 201, whereby it is intended to propagate the sound emitted by the vibrating member 110 vibrating due to the sound generating device 121, and suppresses the propagation of the sound in a non-propagation region 202, where the sound is not intended to propagate. The propagation region 201 is located near the vibrating member 110, and the non-propagation region 202 is the region adjacent to the vibrating member 110 at a greater distance from the propagation region 201. The correction filter 135 has the filter characteristic G inherent to the sound system 100. The filter characteristic G of the correction filter 135 is derived from the transmission characteristics of the sound emitted and propagated by the vibrating member 110 vibrating due to the exciter 122.

[0040] Next, the characteristic manufacturing system 300, which is capable of setting the filter characteristics G of the correction filter 135 provided by the sound system 100, will be described. Figure 4 This is a diagram showing the characteristic fabrication system 300 of the first measurement method. Figure 5 This diagram illustrates a characteristic fabrication system 300 for the second measurement method. The characteristic fabrication system 300 is a system for fabricating the filter characteristics G of the correction filter 135 included in the sound system 100. It includes a sound system 100 without set filter characteristics G, a characteristic fabrication unit 340, and a measurement device 350. In this embodiment, the sound system 100 includes a first switch 371, a second switch 372, and a third switch 373.

[0041] The filter characteristic G is constructed based on the first sound signal used for measurement. For example, the first sound signal used for measurement can be a specified sound signal, a sine wave signal, a swept sine wave signal, a pulse signal, a random noise signal, a colored noise signal, an M-sequence signal, a TSP (time-stretched pulse) signal, etc.

[0042] The measuring device 350 is a device for measuring the sound generated by the sound system 100. A microphone can be used as an example of the measuring device 350 for measuring sound. Alternatively, a displacement sensor, a velocity sensor, an acceleration sensor, etc., can also be used as the measuring device 350.

[0043] The characteristic creation unit 340 configures a measuring device 350 at one or more locations within the non-propagation area 202. Based on a first sound pressure transfer function H1 between a first measuring signal P1 and a first sound signal, and a second sound pressure transfer function H2 between a second measuring signal P2 and a second sound signal, it creates the filter characteristic G of the correction filter 135. The first measuring signal P1 is a signal obtained by the measuring device 350 from sound emitted from the sound generating device 121 and passing through the vibrating member 110 based on the first sound signal. The second measuring signal P2 is a signal obtained by the measuring device 350 from sound emitted from the vibrating member 110 due to the excitation force generated by the exciter 122 based on the first sound signal. In this embodiment, the characteristic creation unit 340 uses Fourier transform to derive the filter characteristic G. The specific derivation method will be described later. The characteristic creation unit 340 is a processing unit implemented by executing the characteristic creation program using a processor of a dedicated or general-purpose computer.

[0044] Next, the manufacturing method of the sound system 100 using the feature creation system 300 will be explained. For example... Figure 4 As shown, the sound system 100 is positioned in a designated location. Additionally, a measuring device 350 is positioned at the boundary between the propagation area 201 and the non-propagation area 202.

[0045] Switching the first switch 371 and the second switch 372 causes the sound generating device 121 to generate sound based on the first sound signal S1 (see reference). Figure 4 At this point, switch the third switch 373 to short-circuit the exciter 122.

[0046] The measuring device 350 measures the sound generated from the sound generating device 121 and passing through the vibrating member 110 to obtain a first measuring signal P1. The characteristic processing unit 340 derives a first sound pressure transfer function H1 between the first sound signal S1 and the first measuring signal P1.

[0047] Next, the first switch 371 and the third switch 373 are switched so that the vibrator 122 generates sound based on the second sound signal S2 (see reference). Figure 5At this time, the second switch 372 can also be switched to short-circuit the sound generating device 121. Furthermore, the second sound signal S2 is the uncorrected first sound signal S1. That is, the second sound signal S2 is the same as the first sound signal S1.

[0048] Without changing the position of the measuring device 350 that measured the first measurement signal P1, the measuring device 350 measures the sound generated by the vibrator 122 causing the vibrating member 110 to vibrate based on the second sound signal S2, thereby measuring the second measurement signal P2. The characteristic generation unit 340 derives the second sound pressure transfer function H2 between the second sound signal S2 and the second measurement signal P2, and together with the previously derived first sound pressure transfer function H1, derives the filter characteristic G of the correction filter 135.

[0049] The sound system 100 can be manufactured by setting the filter characteristics G of the correction filter 135 manufactured by the characteristic manufacturing unit 340 to the correction filter 135 provided by the sound system 100.

[0050] Furthermore, the present invention is not limited to the embodiments described above. For example, other embodiments implemented by arbitrarily combining the constituent elements described in this specification may also be embodiments of the present invention. In addition, other embodiments implemented by excluding several constituent elements may also be embodiments of the present invention. Furthermore, modifications that can be conceived by those skilled in the art to the above embodiments without departing from the spirit of the present invention, that is, the meaning expressed by the statements in the claims, are also included in the present invention.

[0051] For example, the case where the filter characteristics G used for the correction filter 135 are derived by measuring the first measurement signal P1 and the second measurement signal P2 using a measuring device 350 located at one site is described. However, it is also possible to... Figure 6 As shown, multiple measuring devices 350 are arranged at multiple locations or their positions are changed to measure multiple first measuring signals P1 and multiple second measuring signals P2, thereby deriving the filter characteristics G. In this case, the filter characteristics G of the correction filter can also be derived based on the third sound pressure transfer function H3 between the first processed signal and the first sound signal S1, and the fourth sound pressure transfer function H4 between the second processed signal and the second sound signal S2. The first processed signal is a signal obtained by statistically processing the first measuring signal P1 measured at a number different from the number of sound generating devices 121 installed on the vibrating member 110, and the second processed signal is a signal obtained by statistically processing the second measuring signal P2 measured at a number different from the number of exciters 122 installed on the vibrating member 110.

[0052] In addition, it can also be like Figure 7 Multiple exciters 122 are mounted on the vibrating member 110 as shown. Alternatively, the exciters 122 may be mounted on the second surface of the vibrating member 110 on the side adjacent to the sound generating device 121.

[0053] In addition, an example is given of manufacturing the sound system 100 by setting the filter characteristics G of the correction filter 135 based on the measurement results derived by the characteristic manufacturing system 300. However, the filter characteristics G of the correction filter 135 can also be derived by numerical analytical simulation such as FEM (finite element method) or LEM (equivalent circuit analysis method using lumped parameter elements) and set to the correction filter 135 of the sound system 100.

[0054] Furthermore, the case where the second switch 372 and the third switch 373 are configured on the output terminal side of the first driver amplifier 133 and the second driver amplifier 134 in the feature generation system 300 has been described, but they can also be configured on the input terminal side. In this case, if a voltage-driven amplifier with sufficiently low output impedance is used as the measurement amplifier, the same effect as short-circuiting the switch configured on the output terminal side can be obtained by short-circuiting the input terminal of the measurement amplifier to ground potential.

[0055] Alternatively, it can be like Figure 8 The second base 126 of the vibrator 122 is connected to the fixing member 150 as shown.

[0056] (Summarize)

[0057] The first-mode sound system 100 includes: a vibrating member 110; one or more sound generating devices 121 that generate sound toward the vibrating member 110 based on a sound signal; one or more exciters 122 mounted on the vibrating member 110 and applying vibration to the vibrating member 110; a first signal output device 131 that outputs a first sound signal to the sound generating device 121; and a second signal output device 132 that outputs a second sound signal, obtained by correcting the first sound signal in a manner that suppresses the propagation of sound in a non-propagation region 202 outside the region where the sound based on the first sound signal is emitted from the sound generating device 121 and passes through the vibrating member 110.

[0058] According to the first method, sound propagation can be suppressed in the following way: in the intended area, i.e., the propagation area 201, where sound is intended to propagate to the vibrating member 110, sound propagation can be suppressed in the non-propagation area 202, where sound propagation is difficult to suppress by conventional devices and methods. Therefore, it is possible to arbitrarily create a space where sound only reaches people within the propagation area 201 near the sound system 100 and is difficult to reach people outside the propagation area 201. Such a space can be created, for example, in an airplane cabin or a car interior, allowing sound to reach people sitting in designated seats and enabling people in other seats to hear other sounds or enjoy conversation.

[0059] The second type of sound system 100 includes the first type, wherein the vibrating member 110 is a plate-shaped component such that the propagation speed of the bending wave within the frequency range of the sound contained in the first sound signal does not exceed the speed of sound in air at room temperature.

[0060] The third-mode sound system 100 includes either the first or second mode, and has a housing 140 that holds the vibrating member 110 and together with the vibrating member 110 forms a sealed space, and a sound generating device 121 is disposed within the housing 140.

[0061] According to the third method, sound can be propagated more strongly in a specified direction.

[0062] The fourth type of sound system 100 includes any one of the first to third types and has a fixing member 150 for fixing the part of the exciter 122 opposite to the vibrating member 110.

[0063] According to the fourth method, by connecting the second base 126 of the exciter 122 to the fixed member 150, the vibrating member 110 can be vibrated using structural reaction force. Therefore, even if the exciter 122 is lightweight, the excitation force can be effectively transmitted to the vibrating member 110, and the propagation of sound in the non-propagation region 202 can be effectively suppressed.

[0064] The fifth type of sound system 100 includes any one of the first to fourth types. The second signal output device 132 has a correction filter 135, which corrects the first sound signal and outputs it to the exciter 122. The correction filter 135 has filter characteristics G derived from the transmission characteristics of the sound emitted by the sound generating device 121 and propagated through the vibrating member 110.

[0065] The sixth method of sound system control is a sound system control method that sets the filter characteristics G of the correction filter 135 of the sound system 100 in the fifth method. In this method, a measuring device 350 is arranged at one or more locations within the non-propagation area 202. The filter characteristics G of the correction filter 135 are set based on a first sound pressure transfer function between a first measuring signal and a first sound signal, and a second sound pressure transfer function between a second measuring signal and a second sound signal. The first measuring signal is a signal obtained by the measuring device 350 measuring the sound emitted from the sound generating device 121 based on the first sound signal and propagating through the vibrating member 110. The second measuring signal is a signal obtained by the measuring device 350 measuring the sound emitted from the vibrating member 110 due to the excitation force generated by the exciter 122 based on the second sound signal.

[0066] The seventh method of manufacturing a sound system involves setting the filter characteristics G of the correction filter 135 of the sound system 100 in the fifth method. In this method, a measuring device 350 is disposed at one or more locations within the non-propagation region 202. The filter characteristics G of the correction filter 135 are set based on a first sound pressure transfer function between a first measuring signal and a first sound signal, and a second sound pressure transfer function between a second measuring signal and a second sound signal. The first measuring signal is a signal obtained by the measuring device 350 from the sound emitted from the vibrating member 110 by the excitation force generated by the sound generating device 121 based on the first sound signal. The second measuring signal is a signal obtained by the measuring device 350 from the sound emitted from the vibrating member 110 by the excitation force generated by the exciter 122 based on the second sound signal.

[0067] According to the sixth and seventh methods, the filter characteristics G supporting the correction filter 135 of the sound system 100 can be appropriately set. As a result, the sound emitted from the sound generating device 121 can be propagated to the propagation region 201, which is the intended region, and the propagation of sound to the non-propagation region 202 can be suppressed.

[0068] The eighth method of sound system manufacturing includes the seventh method, which acquires a first measurement signal while the exciter 122 is short-circuited.

[0069] The ninth method of sound system manufacturing includes the seventh method, which acquires a second measurement signal while the sound generating device 121 is short-circuited.

[0070] According to the eighth and ninth methods, the influence of the undriven vibrator 122 or the sound generating device 121 on the measurement can be suppressed.

[0071] The tenth method of sound system manufacturing includes any one of the seventh to ninth methods. Based on the third sound pressure transfer function between the first processed signal and the first sound signal, and the fourth sound pressure transfer function between the second processed signal and the second sound signal, the filter characteristics G of the correction filter 135 are set. The first processed signal is a signal obtained by statistically processing a first measured signal measured at a number of locations different from the number of sound generating devices 121. The second processed signal is a signal obtained by statistically processing a second measured signal measured at a number of locations different from the number of exciters 122 installed on the vibrating member 110.

[0072] When the number of measured signals (number of measurement positions) is consistent with the number of sound generating devices 121 or exciters 122 driven during measurement, the derived filter characteristic G is uniquely determined, thus making it possible to generate unintended processing signals. On the other hand, according to the tenth method, by making the number of measured signals (number of measurement positions) inconsistent with the number of exciters, unintended processing signals will not be generated, and a robust control filter can be calculated.

[0073] Industrial availability

[0074] This invention can be used in sound systems installed in crowded spaces such as aircraft cabins, car interiors, offices, and restaurants.

[0075] Explanation of reference numerals in the attached figures

[0076] 100 sound system

[0077] 110 Vibrating components

[0078] 121 Sound generating device

[0079] 122 Vibrator

[0080] 125 Second movable part

[0081] 126 Second base

[0082] 131 First signal output device

[0083] 132 Second signal output device

[0084] 133 First Driver Amplifier

[0085] 134 Second Driver Amplifier

[0086] 135 Correction Filter

[0087] 140 housing

[0088] 150 Fixed components

[0089] 200 signal sources

[0090] 201 Transmission Area

[0091] 202 Non-transmission areas

[0092] 300-Feature Creation System

[0093] 340 Feature Production Department

[0094] 350 Measuring Apparatus

[0095] 371 First Switch

[0096] 372 Second Switch

[0097] 373 Third Switch

Claims

1. A sound system, comprising: Vibrating components; One or more sound generating devices, the one or more sound generating devices generating sound toward the vibrating member based on a sound signal; One or more exciters are mounted on the vibrating member to apply vibration to the vibrating member; A first signal output device outputs a first sound signal to the sound generating device; as well as The second signal output device outputs a second sound signal to the exciter in a manner that corrects the first sound signal in a non-propagation region outside the region where the sound propagation based on the first sound signal is emitted from the sound generating device and passes through the vibrating member.

2. The sound system according to claim 1, wherein, The vibrating member is a plate-shaped structure that ensures the propagation speed of the bending wave does not exceed the speed of sound in air at room temperature within the frequency range of the sound contained in the first sound signal.

3. The sound system according to claim 1 or 2, wherein, The sound system includes a housing that holds the vibrating member and together with the vibrating member forms a sealed space. The sound generating device is disposed within the housing.

4. The sound system according to claim 1 or 2, wherein, The sound system includes a fixing member for fixing the part of the exciter opposite to the vibrating member.

5. The sound system according to claim 1 or 2, wherein, The second signal output device has a correction filter, which corrects the first sound signal before outputting it to the exciter. The correction filter has filter characteristics derived from the transmission characteristics of sound emitted by the sound generating device and propagated through the vibrating member.

6. A sound system control method, which is a sound system control method for setting the filter characteristics of a correction filter possessed by the sound system according to claim 5, wherein, A measuring device is disposed at one or more locations within the non-propagation area. The filter characteristics of the correction filter are set based on the first sound pressure transfer function between the first measured signal and the first sound signal, and the second sound pressure transfer function between the second measured signal and the second sound signal. The first measured signal is a signal obtained by the measuring device from the sound emitted from the sound generating device and propagated through the vibrating member based on the first sound signal. The second measured signal is a signal obtained by the measuring device from the sound emitted from the vibrating member due to the excitation force generated by the exciter based on the second sound signal.

7. A method for manufacturing a sound system, comprising manufacturing a sound system by setting the filter characteristics of a correction filter possessed by the sound system according to claim 5, wherein, A measuring device is disposed at one or more locations within the non-propagation area. The filter characteristics of the correction filter are set based on the first sound pressure transfer function between the first measured signal and the first sound signal, and the second sound pressure transfer function between the second measured signal and the second sound signal. The first measured signal is the signal obtained by the measuring device from the sound emitted from the vibrating member by the excitation force generated by the sound generating device based on the first sound signal. The second measured signal is the signal obtained by the measuring device from the sound emitted from the vibrating member by the excitation force generated by the vibrator based on the second sound signal.

8. The method for manufacturing a sound system according to claim 7, wherein, The first measurement signal is acquired while the exciter is short-circuited.

9. The method for manufacturing a sound system according to claim 7, wherein, The second measurement signal is acquired while the sound generating device is short-circuited.

10. The method for manufacturing a sound system according to claim 7, wherein, The filter characteristics of the correction filter are set based on the third sound pressure transfer function between the first processed signal and the first sound signal, and the fourth sound pressure transfer function between the second processed signal and the second sound signal. The first processed signal is a signal obtained by statistically processing the first measured signal measured at a number of locations different from the number of sound generating devices. The second processed signal is a signal obtained by statistically processing the second measured signal measured at a number of locations different from the number of exciters installed on the vibrating member.

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