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

Abstract

The present invention provides a sound system, a sound system control method, and a sound system manufacturing method for making sound propagation within an intended range. The sound system (100) includes: a loudspeaker device having a first loudspeaker (110) and a second loudspeaker (120), the first loudspeaker (110) having a first diaphragm (111) and the second loudspeaker (120) having a second diaphragm (121) disposed around the first diaphragm (111); a first signal output device for outputting a first sound signal to the first loudspeaker (110); and a second signal output device for outputting a second sound signal to the second loudspeaker (120), the second sound signal being a signal obtained by correcting the first sound signal in a manner that suppresses the propagation of sound emitted from the first loudspeaker (110) based on the first sound signal in a non-propagation area, the non-propagation area being an area outside the area where sound is intended to propagate.

Description

Technical Field

[0001] This disclosure relates to a sound system that limits 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 situations such as an airplane cabin where different sounds are emitted from multiple speakers located in different positions, prevents the sound emitted from speakers other than a designated speaker from reaching a person seated 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, there is room for improvement in the sound system described in the aforementioned Patent Document 1.

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

[0009] Solution for solving the problem

[0010] The sound system disclosed herein includes: a loudspeaker device having a first loudspeaker and a second loudspeaker, the first loudspeaker having a first diaphragm and the second loudspeaker having a second diaphragm disposed around the first diaphragm; a first signal output device for outputting a first sound signal to the first loudspeaker; and a second signal output device for outputting a second sound signal to the second loudspeaker, the second sound signal being a signal obtained by correcting the first sound signal in a manner that suppresses the propagation of sound emitted from the first loudspeaker based on the first sound signal in a non-propagation area, the non-propagation area being an area outside the area where the sound is intended to propagate.

[0011] As one aspect of this disclosure, a sound system control method is used to set the filter characteristics of a correction filter possessed by a sound system. The sound system includes: a loudspeaker assembly comprising a first loudspeaker and a second loudspeaker, the first loudspeaker having a first diaphragm and the second loudspeaker having a second diaphragm disposed around the first diaphragm; a first signal output device for outputting a first sound signal to the first loudspeaker; and a second signal output device for outputting a second sound signal to the second loudspeaker, the second sound signal being a signal obtained by correcting the first sound signal in a manner that suppresses the propagation of sound emitted from the first loudspeaker based on the first sound signal in a non-propagation region, the non-propagation region being a region outside the region where the sound is intended to propagate, and the second signal output device having a correction... A filter, wherein the correction filter corrects the first sound signal and outputs it to the second speaker, the correction filter having filter characteristics derived from the transmission characteristics of the sound emitted and propagated by the second speaker, wherein in the sound system control method, a measuring device is configured at one or more locations in the non-propagation area, and 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, wherein the first measuring signal is a signal obtained by the measuring device measuring the sound emitted from the first speaker based on the first sound signal, and the second measuring signal is a signal obtained by the measuring device measuring the sound emitted from the second speaker based on the second sound signal.

[0012] As one aspect of this disclosure, a sound system manufacturing method is used to manufacture a sound system by setting the filter characteristics of a correction filter possessed by the sound system. The sound system includes: a loudspeaker assembly comprising a first loudspeaker and a second loudspeaker, the first loudspeaker having a first diaphragm and the second loudspeaker having a second diaphragm disposed around the first diaphragm; a first signal output device for outputting a first sound signal to the first loudspeaker; and a second signal output device for outputting a second sound signal to the second loudspeaker, the second sound signal being a signal obtained by correcting the first sound signal in a manner that suppresses the propagation of sound emitted from the first loudspeaker based on the first sound signal in a non-propagation region, the non-propagation region being a region outside the region where the sound is intended to propagate; and the second signal output device... The system includes a correction filter that corrects the first sound signal and outputs it to the second loudspeaker. The correction filter has filter characteristics derived from the transmission characteristics of the sound emitted and propagated by the second loudspeaker. 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 measuring the sound emitted from the first loudspeaker based on the first sound signal, and the second measuring signal is a signal obtained by the measuring device measuring the sound emitted from the second loudspeaker 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 It is a cross-sectional view of the loudspeaker unit in a sound system.

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

[0020] Figure 6 This is a diagram illustrating another example of a feature creation system. Detailed Implementation

[0021] 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 for the purpose of explaining 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 do not indicate mathematical rigor and include substantially permissible errors and deviations. Furthermore, expressions such as simultaneous and identical also include substantially permissible ranges.

[0022] In addition, the accompanying drawings are schematic diagrams that have been appropriately emphasized, omitted or proportionally adjusted for the purpose of illustrating this disclosure, and differ from the actual shapes, positional relationships and proportions.

[0023] Furthermore, several inventions may sometimes be described in general terms as a single embodiment. Additionally, a portion of the following description is intended as any constituent element relating to this disclosure.

[0024] Figure 1 This is a three-dimensional view showing the sound system 100. Figure 2 This is a cross-sectional view of the loudspeaker device 101 included in the sound system 100. 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 A sound system 100 is a system that transmits sound within a non-transmission area 202 outside the transmission area 201 and suppresses the transmission of sound. The sound system 100 includes a loudspeaker device 101, 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 partition 141.

[0025] The loudspeaker device 101 is a device comprising a relatively small first loudspeaker 110 and a relatively large second loudspeaker 120. In this embodiment, the loudspeaker device 101 employs a so-called coaxial loudspeaker.

[0026] The first loudspeaker 110 is a device that generates sound in a predetermined direction based on a first sound signal. The sound system 100 may also include one or more first loudspeakers 110. The first loudspeaker 110 is a loudspeaker that emits sound in the same direction as the second loudspeaker 120 (X-direction in the figure), and includes a first diaphragm 111, a first voice coil 112, and a first magnetic circuit 113.

[0027] The shape of the first vibrating plate 111 is not limited, but in this embodiment, a dome shape is adopted.

[0028] The first voice coil 112 is wound around the cylindrical first winding tube 114 and connected to the first diaphragm 111 via the first winding tube 114.

[0029] The type of the first magnetic circuit 113 is not limited, but in this embodiment, the first magnetic circuit 113 is an internal magnetic type.

[0030] The second loudspeaker 120 is a device that generates sound in the same direction as the first loudspeaker 110 based on a second sound signal. The sound system 100 may have one or more second loudspeakers 120. The second loudspeaker 120 is a loudspeaker that emits sound in the same direction as the first loudspeaker 110 (X-direction in the figure) around the first loudspeaker 110, and includes a second diaphragm 121, a second voice coil 122, and a second magnetic circuit 123.

[0031] The second diaphragm 121 is a diaphragm arranged to surround the first diaphragm 111. The shape of the second diaphragm 121 is not limited, but it is conical in this embodiment. A hole is provided in the center of the second diaphragm 121, and the first loudspeaker 110 is arranged to pierce the hole.

[0032] The second voice coil 122 is wound around a cylindrical second winding tube 124 and connected to the second diaphragm 121 via the second winding tube 124. In this embodiment, the winding axis of the second voice coil 122 is coaxial with the winding axis of the first voice coil 112. The second winding tube 124 is arranged to surround the first loudspeaker 110 and is connected to the frame 102 via a damper 103.

[0033] The type of the second magnetic circuit 123 is not limited, but in this embodiment, the second magnetic circuit 123 is an external magnetic type, and the first magnetic circuit 113 of the first speaker 110 is installed at the center magnetic pole of the second magnetic circuit 123.

[0034] In this embodiment, the speaker device 101 is mounted on the partition 141. The material and shape of the partition 141 are not limited. For example, the partition 141 can be a rectangular plate-shaped component made of metal, resin, or wood. The partition 141 closes the opening of the rectangular box-shaped housing 140, thus keeping it within the housing 140 in a sealed manner. The speaker device 101 is a sealed speaker that houses the rear side (X+ side in the figure) of the second speaker 120 in a sealed state.

[0035] The first signal output device 131 is a device that outputs a first sound signal to the first speaker 110. The first signal output device 131 is not limited, but in this embodiment, it includes a first driver amplifier 133. The first driver amplifier 133 is an amplifier that amplifies the first sound signal emitted from the signal source 200 until sound can be emitted from the first speaker 110. Furthermore, the first signal output device 131 may also include any filter such as a delay filter or a correction filter.

[0036] The second signal output device 132 is a device that outputs a second sound signal to the second speaker 120. This second sound signal is a signal obtained by correcting a first sound signal in a non-propagation region 202, which is a region outside the propagation region 201 intended for sound to propagate through the air. The second signal output device 132 is not limited, but in this embodiment, it includes a second drive amplifier 134. The second drive amplifier 134 amplifies the second sound signal corrected to suppress sound propagating from the second speaker 120 to the non-propagation region 202. In this embodiment, the second drive amplifier 134 amplifies the second sound signal corrected by the correction filter 135.

[0037] The correction filter 135 is a filter that outputs a second sound signal to the second speaker 120. This second sound signal is a signal obtained by correcting the first sound signal emitted from the first speaker 110 in a manner that allows the sound to propagate within the intended propagation region 201 and suppresses the propagation of the sound in the unintentional propagation region 202. The propagation region 201 exists in the vicinity of the first speaker 110, and the unintentional propagation region 202 is a region adjacent to a position further away from the first speaker 110 than the propagation region 201. The correction filter 135 has a filter characteristic G specific to the sound system 100. The filter characteristic G of the correction filter 135 is derived based on the transmission characteristics of the sound emitted and propagated by the second speaker 120.

[0038] 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. The system includes a sound system 100 without pre-defined 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.

[0039] 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 signal, a pulse signal, a random noise signal, a colored noise signal, an M-sequence signal, a TSP (timestretch pulse) signal, etc.

[0040] 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.

[0041] The feature creation unit 340 configures a measuring device 350 at one or more locations within the non-propagation area 202. It creates the filter characteristics G of the correction filter 135 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. The first measuring signal P1 is obtained by the measuring device 350 measuring the sound emitted from the first speaker 110 based on the first sound signal, and the second measuring signal P2 is obtained by the measuring device 350 measuring the sound emitted from the second speaker 120 based on the second sound signal. In this embodiment, the feature creation unit 340 uses a Fourier transform to derive the filter characteristics G. The specific derivation method will be described later. The feature creation unit 340 is a processing unit implemented by executing the feature creation program using a processor found in a dedicated or general-purpose computer.

[0042] Next, the manufacturing method of the sound system 100 using the feature creation system 300 will be explained. For example... Figure 4As 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.

[0043] The first speaker 110 switches the first switch 371 and the second switch 372 in such a way that the first speaker 110 generates sound based on the first sound signal S1 (see reference). Figure 4 At this point, the third switch 373 is switched by short-circuiting the second speaker 120.

[0044] The measuring device 350 measures the sound generated from the first speaker 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.

[0045] Next, the first switch 371 and the third switch 373 are switched in such a way that the second speaker 120 generates sound based on the second sound signal S2 (see reference). Figure 5 At this time, the second switch 372 can also be switched by short-circuiting the first speaker 110. 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.

[0046] Without changing the position of the measuring device 350 that measured the first measurement signal P1, the measuring device 350 measures the sound generated from the second speaker 120 based on the second sound signal S2 to measure 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.

[0047] The sound system 100 can be manufactured by setting the filter characteristic G of the correction filter 135 produced by the characteristic production unit 340 to the correction filter 135 provided by the sound system 100.

[0048] 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, or by excluding certain constituent elements, may also be considered embodiments of the present invention. In addition, modifications that can be conceived by those skilled in the art to the above embodiments without departing from the spirit of the present invention, i.e., the meaning of the statements in the claims, are also included in the present invention.

[0049] For example, the case where a measuring device 350 configured at one location measures a first measuring signal P1 and a second measuring signal P2, and derives the filter characteristics G for the correction filter 135 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, and filter characteristics G are derived. In this case, the filter characteristics G of the correction filter can also be derived based on the first sound pressure transfer function H1 between the first processed signal and the first sound signal S1, and the second sound pressure transfer function H2 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 signals P1 measured at a number of locations different from the number of first speakers 110, and the second processed signal is a signal obtained by statistically processing the second measuring signals P2 measured at a number of locations different from the number of second speakers 120.

[0050] In addition, an example is given of manufacturing a sound system 100 by setting the filter characteristic G derived from the measurement results based on the characteristic manufacturing system 300 to the correction filter 135. However, the filter characteristic G of the correction filter 135 can also be derived by numerical analytical simulation such as FEM (finite element method) or LEM (equivalent circuit analytical method using lumped constant elements), and the filter characteristic G can be set to the correction filter 135 of the sound system 100.

[0051] Furthermore, it was explained that the feature fabrication system 300 has the second switch 372 and the third switch 373 configured on the output terminal side of the first driver amplifier 133 and the second driver amplifier 134, 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.

[0052] Furthermore, the type of the first magnetic circuit 113 of the first loudspeaker 110 and the type of the second magnetic circuit 123 of the second loudspeaker 120 are not limited. The type of the first magnetic circuit 113 and the type of the second magnetic circuit 123 can be the same or different.

[0053] (Summarize)

[0054] The first-mode sound system 100 includes: a loudspeaker device having a first loudspeaker 110 and a second loudspeaker 120, the first loudspeaker 110 having a first diaphragm 111 and the second loudspeaker 120 having a second diaphragm 121 disposed around the first diaphragm 111; a first signal output device for outputting a first sound signal to the first loudspeaker 110; and a second signal output device for outputting a second sound signal to the second loudspeaker 120, the second sound signal being a signal obtained by correcting the first sound signal in a manner that suppresses the propagation of sound emitted from the first loudspeaker 110 based on the first sound signal in a non-propagation area, the non-propagation area being an area outside the area where sound is intended to propagate.

[0055] According to the first method, sound can be suppressed in such a way that it propagates within a propagation area 201, which is intended to be a region near the loudspeaker device 101, and in a non-propagation area 202, which is a region where sound propagation is difficult to suppress using 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 where sound is difficult to reach people outside the propagation area 201. Such a space, for example, can be created in an airplane cabin or a car interior where sound reaches people seated in designated seats and allows people seated in other seats to hear other sounds or enjoy conversation.

[0056] The second type of sound system 100 includes the first type, wherein the second signal output device has a correction filter that corrects the first sound signal and outputs it to the second loudspeaker 120. The correction filter has filter characteristics derived from the transmission characteristics near the propagation area of ​​the sound generated by the second loudspeaker 120 through the second diaphragm 121.

[0057] The third-mode sound system 100 includes either the first mode or the second mode. The second signal output device has a correction filter that corrects the first sound signal and outputs it to the second speaker 120. The correction filter has filter characteristics derived from the transmission characteristics of the sound emitted and propagated by the second speaker 120.

[0058] The fourth type of sound system 100 includes any one of the first to third types, wherein, when viewed from above, the sound sources of the first speaker 110 and the second speaker 120 are located at the same position.

[0059] According to the fourth method, the propagation area of ​​sound can be defined with high precision.

[0060] The fifth type of sound system 100 includes any one of the first to fourth types, wherein the first loudspeaker 110 is disposed at the center of the second loudspeaker 120 and coupled to the upper part of the second magnetic circuit 123 of the second loudspeaker 120.

[0061] According to the fifth method, the propagation area of ​​sound can be defined with high precision using a simple construction.

[0062] The sixth type of sound system 100 includes any one of the first to fifth types, and the loudspeaker device is a coaxial loudspeaker.

[0063] According to the sixth method, by using a coaxial two-way coaxial loudspeaker device pre-constructed by the first loudspeaker 110 and the second loudspeaker 120, the loudspeaker device can be realized with a simple structure, thus simplifying the manufacturing process and achieving low cost.

[0064] The seventh type of sound system 100 includes the sixth type, in which, in a coaxial loudspeaker, the height of the first diaphragm 111 is within the range of the height of the second diaphragm 121 when viewed in section.

[0065] According to the seventh method, the positions of the sound sources of the first speaker 110 and the second speaker 120 can be made close in the height direction not only when viewed from above, but also when viewed in cross section, so as to define the sound propagation area with high precision.

[0066] The eighth type of sound system 100 includes the sixth type, in which, in cross-section, the position of the first diaphragm 111 in the height direction is approximately the same as the position of the second diaphragm 121 in the height direction.

[0067] According to the eighth method, the sound source positions of the first speaker 110 and the second speaker 120 can be made approximately the same, and the sound propagation area can be defined with high precision.

[0068] The ninth type of sound system 100 includes any one of the first to eighth types, and the first diaphragm is dome-shaped.

[0069] According to the ninth method, the diffusion performance of sound from the first speaker 110 can be improved, and the sound propagation area can be defined with high precision.

[0070] The tenth method of sound system control is a sound system control method for setting the filter characteristics of the correction filter of the sound system 100 of the third method. In this sound system control method, a measuring device is arranged at one or more locations in the non-propagation area, and the filter characteristics of the correction filter 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 measuring the sound emitted from the first speaker 110 based on the first sound signal, and the second measuring signal is a signal obtained by the measuring device measuring the sound emitted from the second speaker 120 based on the second sound signal.

[0071] The eleventh method for manufacturing a sound system is a method for manufacturing a sound system 100 by setting the filter characteristics of the correction filter provided by the sound system 100 of the third method. In this method, a measuring device 350 is arranged at one or more locations in a non-propagation area, and the filter characteristics of the correction filter 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 measuring the sound emitted from the first speaker 110 based on the first sound signal, and the second measuring signal is a signal obtained by the measuring device measuring the sound emitted from the second speaker 120 based on the second sound signal.

[0072] According to the tenth and eleventh methods, the filter characteristics G of the correction filter 135 corresponding to the sound system 100 can be appropriately set. As a result, the sound emitted from the first speaker 110 can be made to propagate to the intended region 201, and the propagation of sound to the non-propagation region 202 can be suppressed.

[0073] The twelfth method of manufacturing a sound system includes an eleventh method, which involves acquiring a first measurement signal while the second loudspeaker 120 is short-circuited.

[0074] The thirteenth method of manufacturing a sound system includes either the eleventh or twelfth method, in which a second measurement signal is acquired while the first loudspeaker 110 is short-circuited.

[0075] According to the twelfth and thirteenth methods, the influence of the undriven second speaker 120 or the first speaker 110 on the measurement can be suppressed.

[0076] The fourteenth method for manufacturing a sound system includes any one of the eleventh to thirteenth methods, wherein the filter characteristics of a correction filter are set based on a first sound pressure transfer function between a first processed signal and a first sound signal, and a second sound pressure transfer function between a second processed signal and a second sound signal, wherein the first processed signal is a signal obtained by statistically processing a first measured signal measured at multiple locations, and the second processed signal is a signal obtained by statistically processing a second measured signal measured at multiple locations.

[0077] According to the fourteenth method, when the number of measurement signals (the number of measurement positions) is the same as the number of first speakers 110 or second speakers 120 driven during measurement, the derived filter characteristic G is uniquely determined, which may result in unintended processing signals. On the other hand, according to the fourteenth method, by making the number of measurement signals (the number of measurement positions) inconsistent with the number of second speakers 120, a robust control filter can be calculated without generating unintended processing signals.

[0078] Industrial availability

[0079] This disclosure enables the use of sound systems installed in densely populated spaces such as aircraft cabins, car interiors, offices, and restaurants.

[0080] Explanation of reference numerals in the attached figures

[0081] 100: Sound System

[0082] 101: Loudspeaker unit

[0083] 102: Framework

[0084] 103: Damper

[0085] 110: First loudspeaker

[0086] 111: First Vibrating Plate

[0087] 112: First voice coil

[0088] 113: First Magnetic Circuit

[0089] 114: First winding tube

[0090] 120: Second speaker

[0091] 121: Second Vibrating Plate

[0092] 122: Second voice coil

[0093] 123: Second magnetic circuit

[0094] 124: Second winding tube

[0095] 131: First signal output device

[0096] 132: Second signal output device

[0097] 133: First driver amplifier

[0098] 134: Second driver amplifier

[0099] 135: Correction Filter

[0100] 140: Casing

[0101] 141: Partition

[0102] 200: Signal source

[0103] 201: Transmission Area

[0104] 202: Non-transmission area

[0105] 300: Feature Creation System

[0106] 340: Features Production Department

[0107] 350: Measuring apparatus

[0108] 371: First switching switch

[0109] 372: Second switch

[0110] 373: Third switch.

Claims

1. A sound system, comprising: A loudspeaker device comprising a first loudspeaker and a second loudspeaker, the first loudspeaker having a first diaphragm and the second loudspeaker having a second diaphragm disposed around the first diaphragm; A first signal output device outputs a first sound signal to the first speaker; as well as A second signal output device outputs a second sound signal to a second speaker. The second sound signal is a signal obtained by correcting the first sound signal in a manner that suppresses the propagation of sound emitted from the first speaker based on the first sound signal in a non-propagation area, wherein the non-propagation area is an area outside the area where the sound is intended to propagate.

2. The sound system according to claim 1, wherein, The second signal output device includes a correction filter, which corrects the first audio signal before outputting it to the second speaker. The correction filter has filter characteristics derived from the transmission characteristics near the propagation region of the sound generated by the second speaker through the second diaphragm.

3. The sound system according to claim 1 or 2, wherein, The second signal output device includes a correction filter, which corrects the first audio signal before outputting it to the second speaker. The correction filter has filter characteristics derived from the transmission characteristics of the sound emitted and propagated by the second speaker.

4. The sound system according to claim 1, wherein, When viewed from above, the sound sources of the first speaker and the second speaker are located at the same position.

5. The sound system according to claim 1, wherein, The first speaker is disposed at the center of the second speaker and coupled to the upper part of the second magnetic circuit of the second speaker.

6. The sound system according to claim 1, wherein, The loudspeaker device is a coaxial loudspeaker.

7. The sound system according to claim 6, wherein, In the coaxial loudspeaker, when viewed in cross-section, the height of the first diaphragm is within the range of the height of the second diaphragm.

8. The sound system according to claim 6, wherein, In the coaxial loudspeaker, when viewed in cross-section, the position of the first diaphragm in the height direction is approximately the same as the position of the second diaphragm in the height direction.

9. The sound system according to claim 1, wherein, The first vibrating plate is dome-shaped.

10. A sound system control method, used to set the filter characteristics of a correction filter possessed by the sound system according to claim 3, wherein in the sound system control method, 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, wherein... The first measurement signal is a signal obtained by the measuring device measuring the sound emitted from the first speaker based on the first sound signal, and the second measurement signal is a signal obtained by the measuring device measuring the sound emitted from the second speaker based on the second sound signal.

11. A method for manufacturing a sound system, used to manufacture the sound system by setting the filter characteristics of the correction filter possessed by the sound system according to claim 3, wherein in the method for manufacturing the sound system, 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, wherein... The first measurement signal is a signal obtained by the measuring device measuring the sound emitted from the first speaker based on the first sound signal, and the second measurement signal is a signal obtained by the measuring device measuring the sound emitted from the second speaker based on the second sound signal.

12. The method for manufacturing a sound system according to claim 11, wherein, The first measurement signal is acquired while the second speaker is short-circuited.

13. The method for manufacturing a sound system according to claim 11 or 12, wherein, The second measurement signal is acquired while the first speaker is short-circuited.

14. The method for manufacturing a sound system according to claim 11, wherein, The filter characteristics of the correction filter are set based on the first sound pressure transfer function between the first processed signal and the first sound signal, and the second 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 multiple locations, and the second processed signal is a signal obtained by statistically processing the second measured signal measured at multiple locations.

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