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

Abstract

The invention provides a sound system, a sound system control method, and a sound system manufacturing method. A specific reference for the displacement of the exciter movable part is determined. A sound system (100) is provided with: a sound generation device (110); an exciter (120) that generates an excitation force applied to the mounted vibrating member (220); and a connection member (170) disposed between the sound generating device (110) or the structural member (230) and the exciter (120) and / or between the exciter (120) and the vibrating member (220), the connection member (170) connecting the sound generating device (110) or the structural member (230) and the vibrating member (220) via the exciter (120), and the structural member (230) and the sound generating device (110) being connected.

Description

Technical Field

[0001] The present disclosure relates to a sound system that actively shields sound waves, a sound system control method, and a sound system manufacturing method. Background Art

[0002] The following technique is described in Patent Document 1: An exciter that applies vibrations having a vibration phase opposite to that of a speaker unit is installed in a cabinet in which the speaker unit is installed to suppress vibrations of the cabinet of the speaker system.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Laid-Open No. 11-32388 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In addition, in the prior art, the exciter generates a reaction force of the excitation force only by the inertial force of the movable part of the exciter that is not fixed in space and excites the cabinet. Therefore, it is difficult to finely control the vibration of the cabinet as a vibration member. In addition, in order to generate a large inertial force, it is necessary to increase the mass of the exciter. Therefore, there is also a problem that it is difficult to reduce the weight of the speaker system.

[0008] The present disclosure has been made in view of the above problems, and provides a sound system, a sound system control method, and a sound system manufacturing method that can determine a specific reference for the displacement of the movable part of the exciter to improve the accuracy of vibration control and facilitate the weight reduction of the system.

[0009] Solutions to the Problems

[0010] A sound system according to one aspect of the present disclosure includes: a sound generation device that generates sound waves based on a sound signal; an exciter that generates an excitation force applied to a vibration member to which the exciter is attached; and a connection member that is disposed between at least one of the sound generation device or a structural member and the exciter, and between the exciter and the vibration member, and the connection member connects the sound generation device or the structural member and the vibration member via the exciter, and the structural member is directly or indirectly connected to the sound generation device.

[0011] A sound system control method according to one aspect of the present disclosure is used to control a sound system. The sound system includes: a sound generating device that generates sound waves based on a sound signal; a vibrator that generates an exciting force applied to a vibration member to which it is attached; a connecting member that is disposed at least on one of between the sound generating device or a structural member and the vibrator, and between the vibrator and the vibration member, and the connecting member connects the sound generating device or the structural member and the vibration member via the vibrator, and the structural member is directly or indirectly connected to the sound generating device; a sound generating device that generates sound waves based on a sound signal; and a correction filter that corrects the sound signal so as to reduce the transmitted sound of the sound waves through the vibration member and outputs the corrected sound signal to the vibrator. In the sound system control method, the sound generating device is disposed on one side of the vibration member on which the vibrator is attached, and a measuring device is disposed on the other side of the vibration member. The measuring device measures the sound waves generated by the sound generating device based on the sound signal to obtain an object measurement signal, and sets the filter characteristics of the correction filter based on the object sound pressure transfer function between the sound signal and the object measurement signal.

[0012] A sound system manufacturing method according to one aspect of the present disclosure is used to manufacture a sound system. The sound system includes: a sound generating device that generates sound waves based on a sound signal; a vibrator that generates an exciting force applied to a vibration member to which it is attached; a connecting member that is disposed at least on one of between the sound generating device or a structural member and the vibrator, and between the vibrator and the vibration member, and the connecting member connects the sound generating device or the structural member and the vibration member via the vibrator, and the structural member is directly or indirectly connected to the sound generating device; a sound generating device that generates sound waves based on a sound signal; and a correction filter that corrects the sound signal so as to reduce the transmitted sound of the sound waves through the vibration member and outputs the corrected sound signal to the vibrator. In the sound system manufacturing method, the sound generating device is disposed on one side of the vibration member on which the vibrator is attached, and a measuring device is disposed on the other side of the vibration member. The measuring device measures at least one of the sound waves generated by the sound generating device based on the sound signal and the vibration of the vibration member caused by the sound waves generated by the sound generating device to obtain an object measurement signal, and sets the filter characteristics of the correction filter based on the object sound pressure transfer function between the sound signal and the object measurement signal.

[0013] Effects of the Invention

[0014] According to the present disclosure, it is possible to determine a specific reference for the displacement of the movable part of the vibrator to improve the accuracy of vibration control. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram showing Application Example 1 of the sound system.

[0016] Figure 2 This is a cross-sectional view showing the periphery of the exciter of the sound system.

[0017] Figure 3 This is a diagram showing Application Example 2 of the sound system.

[0018] Figure 4 This is a diagram showing Application Example 3 of the sound system.

[0019] Figure 5 This is a perspective view showing another example of the connecting member together with the exciter.

[0020] Figure 6 This is a diagram showing the state of driving the sound generating device for measurement in the characteristic production system.

[0021] Figure 7 This is a diagram showing the state of driving the exciter for measurement in the characteristic production system.

[0022] Figure 8 This is a diagram showing Another Example 1 of the characteristic production system.

[0023] Figure 9 This is a diagram showing Another Example 2 of the characteristic production system. Detailed Implementation Manner

[0024] Next, embodiments of the sound system, the sound system control method, and the sound system manufacturing method according to the present disclosure will be described with reference to the accompanying drawings. In addition, the following embodiments are examples shown for the purpose of explaining the present disclosure and are not intended to limit the present disclosure. For example, the shapes, structures, materials, constituent elements, relative positional relationships, connection states, numerical values, mathematical formulas, and the content of each stage and the order of each stage in the method shown in the following embodiments are examples and may sometimes include content not described below. In addition, geometric expressions such as parallel and orthogonal are sometimes used, but these expressions do not represent mathematical strictness and substantially include allowable errors, deviations, etc. In addition, expressions such as simultaneously and identically also substantially include allowable ranges.

[0025] In addition, the accompanying drawings are schematic diagrams obtained by appropriately emphasizing, omitting, or adjusting the ratio for the purpose of explaining the present disclosure, and are different from the actual shapes, positional relationships, and ratios. In addition, the X-axis, Y-axis, and Z-axis shown in the drawings sometimes show orthogonal coordinates arbitrarily set for the purpose of explaining the drawings. That is, the Z-axis is not necessarily the axis along the vertical direction, and the X-axis and Y-axis do not necessarily exist in the horizontal plane.

[0026] In addition, sometimes multiple inventions are collectively described below as one embodiment. Additionally, a part of the content described below is explained as an arbitrary constituent element related to the present disclosure.

[0027] Figure 1 FIG. is a diagram showing the sound system 100. Figure 2 FIG. is a cross-sectional view around the exciter 120 of the sound system 100. The sound system 100 is a system that vibrates the vibration member 220, and includes an exciter 120 and a connection member 170. In the case of the present embodiment, the sound system 100 is a system that generates sound waves in a prescribed first space 211 and reduces the volume of the transmitted sound that has passed through the vibration member 220 in a second space 212 separated from the first space 211 by the vibration member 220, that is, a system that reduces the vibration of the vibration member 220 caused by the sound waves generated in the first space 211. The sound system 100 includes a sound generation device 110, a correction filter 130, a delay filter 140, a common filter 150, a first drive amplifier 161, and a second drive amplifier 162.

[0028] The first space 211 is a space in which the sound generation device 110 emits sound waves. The first space 211 is not limited. For example, as Figure 3 shown, the first space 211 may also be a space that functions as a box (enclosure) that shields the surround sound of the back of the speaker unit of the sound generation device 110 when the sound generation device 110 also emits sound waves into the interior space 213 of the moving body. This space is the interior space of a moving body 210 such as a vehicle, a ship, or an airplane. Also, it may be the interior space of a box (enclosure) of a normal speaker system as Figure 4 shown. In this case, the sound generation device 110 also emits sound waves into the second space 212.

[0029] The second space 212 is a space separated from the first space 211 by the vibration member 220. The second space 212 is a space where it is desirable to minimize the leakage of the sound that rings in the first space 211 by the sound generation device 110. In addition, the first space 211 and the second space 212 may be separated by the vibration member 220, or may be spatially connected while being separated by the vibration member 220.

[0030] The exciter 120 includes a vibration unit, which is installed on the vibration member 220, and generates an exciting force by using an actuator (exciter) that vibrates the vibration member 220 based on an input sound signal. The exciter 120 is a device for generating an exciting force applied to the installed vibration member 220. The type of the vibration unit of the exciter 120 is not limited, and examples include a vibration unit using a piezoelectric element, a vibration unit using a magnetostrictive element, etc. In the case of the present embodiment, the vibration unit of the exciter 120 is a magnet-type electric actuator including a magnet 121, a top plate 122, a bottom plate 123, a voice coil 124, a suspension 127, and a mounting member 126.

[0031] The magnet 121 is a magnetized cylindrical permanent magnet.

[0032] The top plate 122 is installed on one end face of the magnet 121. In the case of the present embodiment, the top plate 122 is a circular plate, the diameter of which is larger than the diameter of the cylindrical magnet 121, and the central axis of the magnet 121 coincides with the central axis of the top plate.

[0033] The bottom plate 123 is installed on the other end face of the magnet 121 and is a yoke that guides the magnetic flux emitted from the other end face of the magnet 121 to the vicinity of the circumferential surface of the top plate 122. In the case of the present embodiment, the bottom plate 123 is a bottomed cylindrical shape, and a circular flange portion 128 extends outward. The bottom plate 123 coaxially houses the magnet 121 and the top plate 122, and an annular magnetic gap 129 is formed between the top plate 122 and the bottom plate 123.

[0034] The voice coil 124 is a coil disposed in the magnetic gap and input with the sound signal 201. An exciting force corresponding to the sound signal 201 is generated in the axial direction of the voice coil 124 due to the interaction between the variable magnetic force generated in the voice coil 124 and the constant magnetic force existing in the magnetic gap 129. In the case of the present embodiment, the voice coil 124 is wound around the outer circumference of a cylindrical bobbin 125.

[0035] The suspension 127 is a member that elastically connects between the bobbin 125 and the flange portion 128. The suspension 127 supports the voice coil 124 and the bobbin 125 to vibrate linearly in the axial direction of the voice coil 124.

[0036] The mounting member 126 is a circular member installed on the vibration member 220, etc. The mounting member 126 is installed on the voice coil 124 via the bobbin 125 and is used to transmit the vibration of the voice coil 124 to the vibration member 220.

[0037] Based on the above structure, the vibration unit of the exciter 120 causes the magnetic circuit having the magnet 121, the top plate 122, and the bottom plate 123 and the voice coil body having the voice coil 124, the bobbin 125, and the mounting member 126 to reciprocate relative to each other in the axial direction of the reel of the voice coil 124 based on the force generated in the voice coil 124, thereby generating vibration. The exciter 120 can impart vibration corresponding to the sound signal 201 to the vibration member 220 joined to the mounting member 126 by adhesion. Thereby, sound waves corresponding to the sound signal 201 are generated from the vibration member 220. The vibration unit of the above exciter 120 has an internal magnetic type magnetic circuit, but the vibration unit of the exciter 120 may also have an external magnetic type magnetic circuit.

[0038] In addition, the number of vibration units constituting the vibration unit of the exciter 120 is not limited to one, and it may also be an exciter having a plurality of vibration units, preferably three or more vibration units arranged in the same plane or three-dimensional positions not on the same straight line, and connecting the movable parts of each vibration unit. In the exciter obtained by connecting the movable parts of a plurality of vibration units, the effect of the moment reaction force generated due to the distance between the vibration units is used to suppress the swing resonance of the movable part that is likely to occur in the structure of a single vibration unit. Therefore, it has the following advantages: the setting of the filter characteristics of the correction filter 130 described later becomes easy, and the sound insulation performance of the sound system 100 is improved. In this case, the drive current of the exciter 120 may be the sound signal 201 supplied in parallel to a plurality of vibration units via a single correction filter 130 and a single second drive amplifier 162, or the sound signal 201 supplied independently to a plurality of vibration units via a plurality of correction filters 130 and a plurality of second drive amplifiers 162.

[0039] The vibration member 220 is a member to which vibration is applied by the exciter 120. The vibration member 220 is not limited. For example, the vibration member 220 may also be Figure 3 as shown, a part or all of the door of a moving body 210 such as a vehicle, a ship, or an aircraft, or a part or all of the main body. In addition, the vibration member 220 may also be a wall, a fence, etc. provided to separate the first space 211 from the second space 212. In addition, as Figure 4 shown, in the case where the first space 211 is the internal space of the cabinet (outer shell) of the speaker system, etc., the vibration member 220 may also be a structural member of the cabinet (outer shell).

[0040] The structural member 230 is a member that is connected to the sound generating device 110 and disposed at a predetermined distance from the vibration member 220. For example, the structural member 230 is Figure 1As shown, it is a mount that connects and arranges the sound generating device 110 by means of fastening force, adhesive force generated by bolts, etc., or static frictional force generated by its own weight. The structural member 230 is not limited. For example, the structural member 230 can also be as Figure 3 shown, a part or all of the door of a moving body 210 such as a vehicle, a ship, or an airplane, or a part or all of the main body, which is connected to the speaker unit as the sound generating device 110. Or, it can also be as Figure 4 shown, a part of the cabinet (outer shell) of the speaker system and a partition connected to the speaker unit as the sound generating device 110. The distance between the structural member 230 and the vibration member 220 is structurally maintained as fixed in a normal state (a state where a force stronger than the maximum force received from the exciter 120 is not applied to at least one of the vibration member 220 and the structural member 230). In addition, "structurally maintaining the distance as fixed" includes the change in the distance to the extent that at least one of the vibration member 220 and the structural member 230 bends due to the exciting force of the exciter 120.

[0041] The connecting member 170 is a member that structurally connects the structural member 230 and the vibration member 220 by means of the exciter 120. The connecting member 170 can be arranged, for example, as Figure 1 and Figure 4 shown, between the structural member 230 and the exciter 120, or can be arranged as Figure 3 shown, between the exciter 120 and the vibration member 220. In addition, as Figure 3 shown, the exciter 120 can also be installed on the surface of the vibration member 220 side of the sound generating device 110. The connecting member 170 can also be arranged between the integrally fixed exciter 120 and the sound generating device 110 and the vibration member 220. In addition, the connecting member 170 can also be arranged between the structural member 230 and the integrally fixed exciter 120 and the sound generating device 110. That is to say, the connecting member 170 can also structurally connect the structural member 230 and the vibration member 220 by means of other members such as the sound generating device 110 and the exciter 120. In addition, the exciter 120 and the vibration member 220, and the structural member 230 and the vibration member 220 can be respectively connected structurally by two connecting members 170.

[0042] The material and shape of the connecting member 170 are not limited. The connecting member 170 only needs to have a structural strength capable of maintaining the distances of the connecting member 170, the exciter 120, and the structural member 230 fixed in a normal state, and any shape such as a prismatic shape, a cylindrical shape, or a truss structure can be adopted. In addition, it can also be, as Figure 5As shown, at least a part of the connecting member 170 has a deformation part 171, and the deformation part 171 deforms when a force stronger than the maximum force received from the exciter 120 is applied in the arrangement direction of the vibration member 220 and the structural member 230 (the extending direction of the connecting member 170). The deformation part 171 can deform due to fracture or the like, or can deform due to plastic deformation or the like. In addition, as Figure 5 shown, the deformation part 171 can also be provided on a part of the connecting member 170, and the whole of the connecting member 170 can also function as the deformation part 171. In the case where an abnormality such as a collision occurs in the moving body 210 on which the sound generating device 110 is installed and a large force is generated in the extending direction of the connecting member 170, etc., it is possible to prevent the exciter 120 from protruding from the vibration member 220 or the structural member 230 by deforming the deformation part 171 of the connecting member 170.

[0043] The sound generating device 110 is a device that generates sound waves in the first space 211 based on the sound signal 201 output from the signal source 200. The type of the sound generating device 110 is not limited. For example, the sound generating device 110 can be exemplified by a speaker unit, a sound generating exciter that vibrates an object to emit sound, etc. In addition, the sound generating device 110 can also include a cabinet (housing) that holds the speaker unit, a vibration member 220 on which the sound generating exciter is installed, etc. In addition, the sound generating device 110 can also include a plurality of speaker units and a plurality of sound generating exciters, and the sound generating device 110 can also be a multi-way speaker that includes a variety of speaker units.

[0044] The correction filter 130 is a filter that corrects the sound signal 201 output to the exciter 120 to reduce the transmitted sound of the sound wave emitted into the first space 211 by the sound generating device 110 and reaching the second space 212 through the vibration member 220. In the case of the present embodiment, the correction filter 130 has filter characteristics unique to the sound system 100. The filter characteristics of the correction filter 130 are characteristics determined by at least the sound generating device 110, the exciter 120, and the vibration member 220 on which the exciter 120 is installed. In addition, a specific method for setting the filter characteristics of the correction filter 130 will be described later.

[0045] The delay filter 140 is a filter that delays the sound signal 201 output to the sound generating device 110 by Δt (a fixed value) compared to the sound signal 201 output to the exciter 120. In addition, "t" refers to time.

[0046] The common filter 150 is a filter that corrects the sound signal 201 output to the exciter 120 and the sound generating device 110, respectively. The common filter 150 is a filter that cuts off the signal components that cannot completely suppress the amount of sound waves generated by the sound generating device 110 passing through the vibration member 220 only by the correction filter 130 or only by the correction filter 130 and the delay filter 140. In the case of the present embodiment, the common filter 150 corrects the sound signal 201 output from the signal source 200 and before being branched. In addition, the common filter 150 may correct the branched sound signals 201 separately.

[0047] The first drive amplifier 161 amplifies the sound signal 201 output from the signal source 200 until it can drive the sound generating device 110 to emit sound into the first space 211. In the case of the present embodiment, the first drive amplifier 161 amplifies the sound signal 201 corrected by the common filter 150 and corrected by the delay filter 140.

[0048] The second drive amplifier 162 amplifies the sound signal 201 output from the signal source 200 to drive the exciter 120 to vibrate the vibration member 220 to suppress the amount of sound waves emitted into the first space 211 from passing through to the second space 212. In the case of the present embodiment, the second drive amplifier 162 amplifies the sound signal 20 corrected by the common filter 150 and corrected by the correction filter 130.

[0049] Next, a characteristic production system 300 that can set the filter characteristics of the correction filter 130 included in the sound system 100 will be described. Figure 6 FIG. shows the characteristic production system 300. The characteristic production system 300 is a system that produces the filter characteristics of the correction filter 130 included in the sound system 100. The characteristic production system 300 includes a measurement sound generating device 310, a measurement exciter 320, a measurement vibration member 329, a measurement sound source 330, a characteristic production unit 340, a measurement device 350, a first measurement amplifier 361, a second measurement amplifier 362, a first switch 371, a second switch 372, and a third switch 373.

[0050] The sound generation device 310 for measurement is a device that generates sound waves in the first measurement space 311 based on the measurement sound signal S output from the measurement sound source 330. The sound generation device 310 for measurement is preferably the same as or of the same type as the sound generation device 110. In addition, the method of installing the sound generation device 310 for measurement in a box or the like is preferably the same as or substantially the same as the method of installing the sound generation device 110. In addition, the position, posture, etc. of the sound generation device 310 for measurement relative to the measurement vibration member 329 are also preferably the same as or substantially the same as the position, posture, etc. of the sound generation device 110 relative to the vibration member 220.

[0051] The exciter 320 for measurement is a device that vibrates the measurement vibration member 329 based on the measurement sound signal S output from the measurement sound source 330. The exciter 320 for measurement is preferably the same as or of the same type as the exciter 120. In addition, the method of installing the exciter 320 for measurement on the measurement vibration member 329 is preferably the same as or substantially the same as the method of installing the exciter 120 on the vibration member 220.

[0052] The connecting member 370 for measurement is a member that structurally connects the measurement structural member 380 and the measurement vibration member 329 by means of the exciter 320 for measurement. The connecting member 370 for measurement is preferably the same as or substantially the same as the connecting member 170. In addition, the method of structurally connecting the measurement structural member 380 and the measurement vibration member 329 by means of the exciter 320 for measurement by the connecting member 370 for measurement is preferably the same as or substantially the same as the method of structurally connecting the structural member 230 and the vibration member 220 by means of the exciter 120 by the connecting member 170.

[0053] The measurement sound source 330 outputs the measurement sound signal S for measurement. The measurement sound signal S for measurement may not be the sound signal 201 output to the sound system 100. For example, as the measurement sound signal S for measurement, a specified sound signal 201, a sine curve signal, a swept sine signal, a pulse signal, a random noise signal, a colored noise signal, an M-sequence signal, a TSP (time-stretched pulse) signal, etc. can be exemplified.

[0054] The measurement device 350 measures the sound wave generated in the second measurement space 312 by driving the measurement sound generation device 310 or the measurement exciter 320, or measures the vibration generated at the measurement vibration member 329 by driving the measurement sound generation device 310 or the measurement exciter 320. As the measurement device 350 for measuring the sound wave, a microphone can be exemplified. As the measurement device 350 for measuring the vibration, a displacement sensor, a velocity sensor, and an acceleration sensor can be exemplified. In addition, the characteristic creation system 300 may include a plurality of measurement devices 350.

[0055] Based on the object sound pressure transfer function between the object measurement signal Ps and the measurement sound signal S, the characteristic creation unit 340 derives the filter characteristics of the correction filter 130 included in the sound system 100. The object measurement signal Ps is a measurement signal obtained by measuring the sound wave generated in the second measurement space 312 by the measurement sound generation device 310 based on the measurement sound signal S or the vibration of the measurement vibration member 329 caused by the sound wave. The second measurement space 312 is a space of the measurement vibration member 329 that is not the first measurement space 311 where the measurement sound generation device 310 is placed. In the case of the present embodiment, the characteristic creation unit 340 derives not only the corresponding sound pressure transfer function between the corresponding measurement signal Pv and the measurement sound signal S, but also the filter characteristics of the correction filter 130. The corresponding measurement signal Pv is a measurement signal obtained by measuring the sound wave generated at the same position as the position where the object measurement signal Ps is measured or the vibration of the measurement vibration member 329 when the measurement exciter 320 vibrates the measurement vibration member 329 based on the measurement sound signal S. The characteristic creation unit 340 uses Fourier transform to derive the filter characteristics. The specific derivation method will be described later. The characteristic creation unit 340 is a processing unit implemented by causing a processor included in a dedicated or general-purpose computer to execute a characteristic creation program.

[0056] The first measurement amplifier 361 amplifies the measurement sound signal S output from the measurement sound source 330 until it can drive the measurement sound generation device 310 to emit sound into the first measurement space 311. The first measurement amplifier 361 is preferably the same or the same type of amplifier as the first drive amplifier 161.

[0057] The second measurement amplifier 362 amplifies the measurement sound signal S output from the measurement sound source 330 until it drives the measurement exciter 320 to vibrate the measurement vibration member 329. The second measurement amplifier 362 is preferably the same or the same type of amplifier as the second drive amplifier 162.

[0058] In addition, as Figure 8As shown, the characteristic production system 300 can also use a part of the sound system 100 installed in the moving body 210 or the like to produce filter characteristics. And, as Figure 9 shown, a part of the sound system 100 in which the cabinet (outer shell) of a general speaker system is used as the vibration member 220 can also be used to produce filter characteristics.

[0059] Next, a manufacturing method of the sound system 100 using the characteristic production system 300 will be described. As Figure 6 shown, the measurement sound generation device 310 is arranged at a prescribed location in the first measurement space 311. The measurement exciter 320 and the measurement connection member 370 are installed at prescribed locations on the measurement vibration member 329. The measurement vibration member 329 is arranged in the first measurement space 311, and the first measurement space 311 is the side of the measurement vibration member 329 where the measurement exciter 320 is installed. The measurement device 350 is arranged at a prescribed location in the second measurement space 312, and the second measurement space 312 is the other side of the measurement vibration member 329. When measuring the sound wave in the second measurement space 312, the measurement device 350 is arranged at a position away from the measurement vibration member 329. When measuring the vibration of the measurement vibration member 329, the measurement device 350 is arranged to be in contact with the measurement vibration member 329. In this case, the measurement device 350 can also be in the first measurement space 311. Especially in the case where, as Figure 9 shown, a part of the sound system 100 in which the cabinet (outer shell) of a general speaker system is used as the vibration member 220 is used to produce filter characteristics, etc., both the sound wave directly emitted from the sound generation device 110 and the sound wave that propagates after passing through the vibration member 220 are mixed and present in the second space 312 (212). Therefore, an error may occur in the calculation of the object sound pressure transfer function Hs described later. Therefore, in this embodiment, the measurement device 350 measures the vibration of the measurement vibration member 329, and the measurement device 350 is arranged to be in contact with the measurement vibration member 329. Thereby, it is possible to reduce the mixing of the sound wave directly emitted from the sound generation device 110 into the measurement device 350.

[0060] The first changeover switch 371 and the second changeover switch 372 are switched so that the measurement sound generation device 310 generates a sound wave based on the measurement sound signal S (refer to Figure 6 ). At this time, the third changeover switch 373 is switched so that the measurement exciter 320 is short-circuited.

[0061] The measuring device 350 measures the sound waves generated by the measuring sound generating device 310 or the vibration of the measuring vibration member 329 caused by the sound waves to obtain the target measurement signal Ps. In this stage, the characteristic creation unit 340 may also derive the filter characteristic G of the correction filter 130 based on the target sound pressure transfer function Hs between the measuring sound signal S and the target measurement signal Ps.

[0062] In the case of the present embodiment, next, the first changeover switch 371 and the third changeover switch 373 are switched so that the measuring exciter 320 vibrates the measuring vibration member 329 based on the measuring sound signal S (see Figure 7 ). At this time, the second changeover switch 372 may also be switched to short-circuit the measuring sound generating device 310.

[0063] Without changing the position of the measuring device 350 that has measured the target measurement signal Ps, the measuring device 350 measures the sound waves generated by the measuring vibration member 329 vibrating based on the measuring sound signal S by the measuring exciter 320 or the vibration of the measuring vibration member 329 to measure the corresponding measurement signal Pv. The characteristic creation unit 340 derives the corresponding sound pressure transfer function Hv between the measuring sound signal S and the corresponding measurement signal Pv, and derives the filter characteristic G of the correction filter 130 based on the previously derived target sound pressure transfer function Hs according to the following formula.

[0064] Hs = Ps / S

[0065] Hv = Pv / S

[0066] Inverse function calculation: Hs × S + Hv × G × S = 0

[0067] Based on the above: G = -Hs / Hv

[0068] By setting the filter characteristic G of the correction filter 130 manufactured by the characteristic creation unit 340 for the correction filter 130 included in the sound system 100, the sound system 100 can be manufactured.

[0069] By short-circuiting the measurement exciter 320 when measuring the measurement signal Ps of the object to be measured, the following effects can be obtained. That is, the measurement vibration member 329 vibrates due to the sound wave generated by the measurement sound generation device 310, and an induced current is generated in the internal wiring of the measurement exciter 320 due to this vibration. Regarding the generated induced current, the electric energy is consumed by the internal resistance of the measurement exciter 320. Due to the consumption of this electric energy, the measurement exciter 320 apparently operates in a manner that increases the attenuation of the mechanical vibration system. This state is the same as the state in which the exciter 120 in the sound system 100 suppresses the vibration of the vibration member 220 caused by the sound wave generated by the sound generation device 110, and it is possible to improve the accuracy of the filter characteristic G derived by the characteristic production system 300 and effectively suppress the amount of the sound wave generated by the sound generation device 110 passing through the vibration member 220.

[0070] In addition, the present invention is not limited to the above-described embodiments. For example, the constituent elements described in this specification may be arbitrarily combined, and other embodiments achieved by removing several constituent elements may be used as embodiments of the present invention. In addition, modification examples obtained by various modifications conceived by those skilled in the art to the above-described embodiments within the scope not departing from the gist of the present invention, that is, the meaning expressed by the terms described in the claims, are also included in the present invention.

[0071] For example, a case where the correction filter 130 is set to manufacture the sound system 100 based on the filter characteristic derived by the characteristic production system 300 from the measurement result is illustrated, but the filter characteristic of the correction filter 130 may also be derived by numerical analysis simulations such as FEM (finite element method) and LEM (equivalent circuit analysis method using lumped constant elements) and set to the correction filter 130 of the sound system 100.

[0072] In addition, a case where the measurement device 350 disposed at one place is used to measure the object measurement signal Ps and the corresponding measurement signal Pv to derive the filter characteristic G for the correction filter 130 is illustrated, but a plurality of measurement devices 350 may be disposed at multiple places, or the position of the measurement device 350 may be changed to measure a plurality of object measurement signals Ps and a plurality of corresponding measurement signals Pv, and the filter characteristic G may be derived based on them. In this case, the filter characteristic G may also be derived using one each of the object measurement signal Ps and the corresponding measurement signal Pv obtained by performing statistical processing such as the least squares method on the plurality of object measurement signals Ps and the plurality of corresponding measurement signals Pv.

[0073] In addition, although the case where the sound system operates based on the sound signal reproduced in real time has been described, it is also possible to prepare in advance in the storage device a signal obtained by passing the original sound signal through a correction filter or convolving the original sound signal, and a signal obtained by adding a fixed delay corresponding to the correction filter to the original sound signal, and synchronously reproduce both, supply the former to the vibrator, and supply the latter to the sound generating device.

[0074] In addition, although the case where the characteristic production system 300 arranges the second changeover switch 372 and the third changeover switch 373 on the output terminal sides of the first measurement amplifier 361 and the second measurement amplifier 362 has been described, they may also be arranged on the input terminal sides. In this case, when a voltage drive type amplifier with a sufficiently low output impedance is used as the measurement amplifier, the same effect as short-circuiting the changeover switch arranged on the output terminal side can be obtained by short-circuiting the input terminal of the measurement amplifier to the ground potential.

[0075] The sound system 100 of the first mode includes: a sound generating device 110; a vibrator 120 that generates an exciting force applied to the mounted vibration member 220; and a connecting member 170 that is arranged on at least one of between the sound generating device 110 or the structural member 230 and the vibrator 120, and between the vibrator 120 and the vibration member 220. The connecting member 170 connects the sound generating device 110 or the structural member 230 and the vibration member 220 via the vibrator 120, and the structural member 230 is connected to the sound generating device 110.

[0076] According to the first mode, it is possible to determine the specific reference of the displacement at which the vibrator 120 is connected to the sound generating device 110 via the connecting member 170, and the accuracy of the control of the vibration of the vibrator 120 can be improved.

[0077] The sound system 100 of the second mode includes the first mode, and at least a part of the connecting member 170 has a deformation part 171 that deforms when a force stronger than the maximum force received from the vibrator 120 is applied in the arrangement direction of the vibration member 220 and the structural member 230.

[0078] Accordingly, when an unexpected force is generated in the extending direction of the connecting member 170, it is possible to prevent the vibrator 120 from protruding from the vibration member 220 and the structural member 230 by the deformation of the deformation part 171.

[0079] The sound system 100 of the third mode includes the first mode or the second mode, and includes: a sound generating device 110 that generates sound waves based on the sound signal 201; and a correction filter 130 that corrects the sound signal 201 in a manner that reduces the transmitted sound of the sound waves through the vibration member 220 and outputs it to the exciter 120.

[0080] According to the third mode, it is possible to suppress the amount of sound waves emitted by the sound generating device 110 that pass through the vibration member 220.

[0081] The sound system 100 of the fourth mode includes the third mode, and the exciter 120 is installed on the side of the vibration member 220 of the sound generating device 110, and the connecting member 170 is disposed between at least one of the structural member 230 and the integrally fixed exciter 120 and the sound generating device 110, and between the integrally fixed exciter 120 and the sound generating device 110 and the vibration member 220. The connecting member 170 connects the structural member 230 and the vibration member 220 by means of the exciter 120 and the sound generating device 110.

[0082] According to the fourth mode, it is possible to integrally arrange the sound generating device 110, the exciter 120, and the connecting member 170 between the connecting member 170 and the structural member 230, and it is possible to achieve high efficiency in setting up the sound system 100.

[0083] The sound system 100 of the fifth mode includes the third mode or the fourth mode, and further includes a delay filter 140 that delays the sound signal 201 and outputs it to the sound generating device 110.

[0084] According to the fifth mode, it is possible to correct the delay caused by the difference between the path through which the sound signal 201 output to the sound generating device 110 passes and the path through which the sound signal 201 output to the exciter 120 passes, etc., and effectively reduce the amount of sound passing through the vibration member 220.

[0085] The sound system of the sixth mode includes any one of the third mode to the fifth mode, and further includes a common filter 150 that corrects the two sound signals 201, namely, the sound signal 201 output to the exciter 120 and the sound signal 201 output to the sound generating device 110.

[0086] According to the sixth mode, it is possible to cut off the signal components that cannot be completely reduced due to the vibration of the vibration member 220 caused by the exciter 120, and suppress the amount of sound passing through the vibration member 220.

[0087] The sound system 100 of the seventh mode includes any one of the third mode to the sixth mode, and the correction filter 130 has filter characteristics derived based on the object sound pressure transfer function between the object measurement signal and the sound signal 201. The object measurement signal is a measurement signal obtained from at least one of the sound wave generated by the sound generating device 110 on the side of the vibration member 220 where the sound generating device 110 is not placed based on the sound signal 201, and the vibration of the vibration member 220 caused by the sound wave generated by the sound generating device 110.

[0088] According to the seventh mode, the correction filter 130 adapted to the actual state can be introduced into the sound system 100, and the amount of sound transmitted through the vibration member 220 can be effectively suppressed.

[0089] The sound system 100 of the eighth mode includes any one of the third mode to the seventh mode, and the correction filter 130 has filter characteristics derived based on the corresponding sound pressure transfer function between the corresponding measurement signal and the sound signal 201. The corresponding measurement signal is a measurement signal obtained from at least one of the sound wave generated by the exciter 120 vibrating the vibration member 220 based on the sound signal 201 at the position where the object measurement signal is measured, and the vibration.

[0090] According to the eighth mode, the sound system 100 can be provided with the correction filter 130 having filter characteristics that correctly reflect the actual state. By vibrating the vibration member 220, the exciter 120 can effectively suppress the transmission of the sound wave generated by the sound generating device 110.

[0091] The sound system control method of the ninth mode is used to control the sound system 100 of any one of the third mode to the eighth mode. In the sound system control method, the sound generating device 110 is disposed on one side of the vibration member 220 where the exciter 120 is installed, and the measuring device is disposed on the other side of the vibration member 220. The measuring device measures the sound wave generated by the sound generating device 110 based on the sound signal 201 to obtain the object measurement signal, and the filter characteristics of the correction filter 130 are set based on the object sound pressure transfer function between the sound signal 201 and the object measurement signal.

[0092] According to the ninth mode, the amount of the sound wave generated by the sound generating device 110 passing through the vibration member 220 can be suppressed.

[0093] The manufacturing method of the tenth-mode sound system is used to manufacture the sound system 100 of any one of the third mode to the eighth mode. In the sound system manufacturing method, the sound generating device 110 is disposed on one side of the vibration member 220 where the vibrator 120 is installed, and the measuring device is disposed on the other side of the vibration member 220. The measuring device measures at least one of the sound wave generated by the sound generating device 110 based on the sound signal 201 and the vibration of the vibration member 220 caused by the sound wave generated by the sound generating device 110, so as to obtain the target measurement signal. The filter characteristics of the correction filter 130 are set based on the target sound pressure transfer function between the sound signal 201 and the target measurement signal.

[0094] According to the tenth mode, it is possible to manufacture the sound system 100 that can suppress the amount of the sound wave generated by the sound generating device 110 passing through the vibration member 220.

[0095] The manufacturing method of the eleventh-mode sound system includes the tenth mode, and the measuring device measures the sound wave or vibration generated at the position where the object measurement signal is measured when the vibrator 120 vibrates the vibration member 220 based on the sound signal 201, so as to obtain the corresponding measurement signal. The filter characteristics of the correction filter 130 are set based on the corresponding sound pressure transfer function between the sound signal 201 and the corresponding measurement signal.

[0096] According to the eleventh mode, it is possible to manufacture the sound system 100 having the correction filter 130 with filter characteristics that correctly reflect the actual state.

[0097] The manufacturing method of the twelfth-mode sound system includes the tenth mode or the eleventh mode, and the target measurement signal is obtained in a state where the vibrator 120 is short-circuited.

[0098] According to the twelfth mode, it is possible to generate high-precision filter characteristics G.

[0099] The manufacturing method of the thirteenth-mode sound system includes any one of the tenth mode to the twelfth mode, and the filter characteristics of the correction filter 130 are set based on the processing sound pressure transfer function between the processing signal obtained by statistically processing the target measurement signals measured at a plurality of different positions and the sound signal 201.

[0100] According to the thirteenth mode, it is possible to capture the sound passing through the vibration member 220 in a planar manner and effectively suppress the passing sound in the desired area.

[0101] Industrial applicability

[0102] The present disclosure can be used for moving bodies, buildings, etc. having a space that wants to suppress the amount of the sound wave generated in the first space from leaking through the vibration member 220 to the second space.

[0103] Description of Reference Numerals

[0104] 100: Sound system; 110: Sound generating device; 120: Vibrator; 121: Magnet; 122: Top plate; 123: Bottom plate; 124: Voice coil; 125: Bobbin; 126: Mounting member; 127: Suspension; 128: Flange portion; 129: Magnetic gap; 130: Correction filter; 140: Delay filter; 150: Common filter; 161: First drive amplifier; 162: Second drive amplifier; 170: Connecting member; 171: Deformation portion; 200: Signal source; 201: Sound signal; 210: Moving body; 211: First space; 212: Second space; 213: Interior space of the vehicle; 220: Vibration member; 230: Structural member; 300: Characteristic production system; 310: Sound generating device for measurement; 311: First measurement space; 312: Second measurement space; 313: Interior space of the vehicle; 320: Exciter for measurement; 329: Vibration member for measurement; 330: Sound source for measurement; 340: Characteristic production unit; 350: Measuring device; 361: First measurement amplifier; 362: Second measurement amplifier; 370: Connecting member for measurement; 371: First changeover switch; 372: Second changeover switch; 373: Third changeover switch; 380: Structural member for measurement; G: Filter characteristic; S: Sound signal for measurement; Hs: Object sound pressure transfer function; Hv: Corresponding sound pressure transfer function; Ps: Object measurement signal; Pv: Corresponding measurement signal.

Claims

1. A sound system comprising: a sound generating device that generates sound waves based on the sound signal; a vibration exciter that generates an exciting force to be applied to the mounted vibration member; and A connecting member is arranged at least between the sound generating device or the structural member and the exciter, and between the exciter and the vibration member, and the connecting member connects the sound generating device or the structural member to the vibration member by means of the exciter, and the structural member is directly or indirectly connected to the sound generating device.

2. The sound system according to claim 1, wherein: At least a portion of the connecting member includes a deformation portion that deforms when a force stronger than a maximum force received from the vibration exciter is applied in the arrangement direction of the vibration member and the structural member.

3. The sound system according to claim 1 or 2, wherein: have: a sound generating device that generates sound waves based on the sound signal; and The correction filter corrects the sound signal so as to reduce the transmitted sound of the sound wave transmitted through the vibration member, and outputs the corrected sound signal to the exciter.

4. The sound system according to claim 3, wherein: The exciter is mounted on the vibration member side of the sound generating device, The connecting member is arranged at least one of between the structural member and the exciter and the sound generating device fixed integrally thereto, and between the exciter and the sound generating device fixed integrally thereto and the vibration member, and the connecting member connects the structural member and the vibration member with the aid of the exciter and the sound generating device.

5. The sound system according to claim 3, wherein: A delay filter is further provided for delaying the sound signal and outputting the delayed sound signal to the sound generating device.

6. The sound system according to claim 3, wherein: A common filter is further provided for correcting two sound signals, namely, a sound signal output to the exciter and a sound signal output to the sound generating device.

7. The sound system according to claim 3, wherein: The correction filter has a filter characteristic derived from an object sound pressure transfer function between an object measurement signal and a sound signal, wherein the object measurement signal is a measurement signal obtained by measuring at least one of a sound wave generated by the sound generating device based on the sound signal on a side of the vibration component where the sound generating device is not placed, and a vibration of the vibration component caused by the sound wave generated by the sound generating device.

8. The sound system according to claim 7, wherein: The correction filter has a filter characteristic derived based on a corresponding sound pressure transfer function between a corresponding measurement signal and a sound signal, wherein the corresponding measurement signal is a measurement signal obtained by measuring the sound wave generated at the position where the object measurement signal is measured when the exciter vibrates the vibration component based on the sound signal, and at least one of the vibrations.

9. A sound system control method for controlling the sound system according to claim 3, wherein: A sound generating device is arranged on one side of the vibration member on which the exciter is mounted. A measuring device is arranged on the other side of the vibrating member, causing the measuring device to measure the sound wave generated by the sound generating device based on the sound signal to obtain a target measurement signal, A filter characteristic of a correction filter is set based on a target sound pressure transfer function between the sound signal and the target measurement signal.

10. The sound system control method according to claim 9, wherein: The measuring device measures the sound wave or the vibration generated at the position where the target measurement signal is measured by the vibration exciter causing the vibration member to vibrate based on the sound signal, thereby acquiring a corresponding measurement signal. A filter characteristic of a correction filter is set based on a corresponding sound pressure transfer function between the sound signal and the corresponding measurement signal.

11. The sound system control method according to claim 9, wherein: The object measurement signal is acquired in a state where the exciter is short-circuited.

12. The sound system control method according to claim 9, wherein: The filter characteristics of the correction filter are set based on a processed sound pressure transfer function between a processed signal obtained by statistically processing the target measurement signals measured at a plurality of different positions and the sound signal.

13. A sound system manufacturing method for manufacturing the sound system according to claim 3, wherein: A sound generating device is arranged on one side of the vibration member on which the exciter is mounted. A measuring device is arranged on the other side of the vibrating member, The measuring device measures at least one of the sound wave generated by the sound generating device based on the sound signal and the vibration of the vibration member caused by the sound wave generated by the sound generating device to obtain a target measurement signal, A filter characteristic of a correction filter is set based on a target sound pressure transfer function between the sound signal and the target measurement signal.

14. The method for manufacturing a sound system according to claim 13, wherein: The measuring device measures the sound wave or the vibration generated at the position where the target measurement signal is measured by the vibration exciter causing the vibration member to vibrate based on the sound signal, thereby acquiring a corresponding measurement signal. A filter characteristic of a correction filter is set based on a corresponding sound pressure transfer function between the sound signal and the corresponding measurement signal.

15. The method for manufacturing a sound system according to claim 13, wherein: The object measurement signal is acquired in a state where the exciter is short-circuited.

16. The method for manufacturing a sound system according to claim 13, wherein: The filter characteristics of the correction filter are set based on a processed sound pressure transfer function between a processed signal obtained by statistically processing the target measurement signals measured at a plurality of different positions and the sound signal.

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