WO2006075377A1 - 受音装置 - Google Patents
受音装置 Download PDFInfo
- Publication number
- WO2006075377A1 WO2006075377A1 PCT/JP2005/000316 JP2005000316W WO2006075377A1 WO 2006075377 A1 WO2006075377 A1 WO 2006075377A1 JP 2005000316 W JP2005000316 W JP 2005000316W WO 2006075377 A1 WO2006075377 A1 WO 2006075377A1
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- WIPO (PCT)
- Prior art keywords
- sound
- receiving device
- inner peripheral
- microphones
- sound wave
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
- H04R2201/401—2D or 3D arrays of transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
- H04R2201/403—Linear arrays of transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/20—Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
Definitions
- the present invention relates to a sound receiving device having a microphone mouthphone array composed of a plurality of microphone elements (hereinafter simply referred to as “microphones”).
- a microphone device having directivity characteristics in a specific speaker direction has been proposed (see, for example, Patent Document 1 below).
- this microphone device a plurality of microphones are arranged on a plane. Are arranged, and each microphone output is summed via a delay circuit to obtain an output, and the silence detection function unit cross-correlates between the microphone output signals with respect to a predetermined time difference range between the signals.
- the ratio between the function value and the cross-correlation function with respect to the time difference between signals corresponding to the set sound source position is obtained and the value of this ratio satisfies a predetermined threshold condition, the sound source is located at the set position. By detecting the presence, it is judged whether the sound is Z or silent.
- Patent Document 1 Japanese Patent Laid-Open No. 9 238394
- the above-described microphone device when the above-described microphone device is placed in a relatively narrow space such as a room, it is almost always placed on a wall surface or a table in the room. As described above, it is known that when a conventional microphone device is installed on a wall surface or a table, the sound is unclear due to the influence of reflected waves of the wall surface or table force. When speech is recognized, there is a problem that the recognition rate is lowered.
- the boundary microphone device is devised so that it receives only direct sound waves from the speaker and does not receive reflected waves from the wall surface, etc., but it uses a plurality of boundary microphones.
- directivity performance cannot be sufficiently exhibited due to individual differences in the boundary microphone characteristics due to the complexity of the structure of the boundary microphone.
- the microphone array device is mounted on a vehicle, the cabin space is narrow. For this reason, the problem is that sufficient directivity performance due to the influence of reflected sound waves cannot be demonstrated.
- the present invention has been made in view of the above, and an object thereof is to provide a sound receiving device capable of improving directivity with a simple configuration.
- a sound receiving device includes a plurality of microphones and a plurality of microphones, each of which accommodates sound waves from a specific direction. And a housing having a plurality of opening holes.
- the housing may be configured such that the plurality of opening holes have different hardnesses! /.
- the housing may be configured such that the inner peripheral walls of the plurality of opening holes have different hardnesses! /.
- the housing may be configured such that the shapes of the plurality of opening holes are different from each other! /.
- the casing may be configured such that the surface shapes of the inner peripheral walls of the plurality of opening holes are different from each other! /.
- the housing may include a substance that makes the propagation speed of the sound wave slower than air in the plurality of opening holes.
- the casing has a propagation velocity of the sound wave slower than that of air.
- a hard and soft distribution of a substance at a boundary with an inner peripheral wall of each opening hole has the plurality of opening holes. However, they may be configured to be different from each other!
- a sound receiving device includes a plurality of microphones, and a housing having an opening hole in which the plurality of microphones are accommodated and a sound wave from a specific direction is incident. To do.
- the housing is configured such that the hardness of the plurality of regions is different for each of the plurality of regions in the opening hole corresponding to each of the plurality of microphones. Also, you can!
- the casing corresponds to each of the plurality of microphones.
- the inner peripheral walls of the plurality of regions in the opening hole may be configured to have different hardnesses.
- the housing may be formed such that the shapes of the plurality of regions in the opening holes respectively corresponding to the plurality of microphones are different from each other. .
- the casing is formed so that the surface shapes of the inner peripheral walls of the plurality of regions in the opening holes respectively corresponding to the plurality of microphones are different from each other. It is good.
- the casing may include a substance that makes the propagation speed of the sound wave slower than air in the opening hole.
- the casing has a hard-soft distribution at a boundary between the opening and the inner peripheral wall of the substance that makes the sound wave propagation speed slower than air in the plurality of regions. It may be configured differently from each other!
- the plurality of microphones may be non-directional microphones.
- the sound receiving device has an effect that directivity can be improved with a simple configuration.
- FIG. 1 is a block diagram showing an audio processing device including a sound receiving device according to Embodiment 1 of the present invention.
- FIG. 2 is a perspective view showing an external appearance of the sound receiving device shown in FIG.
- FIG. 3 is a cross-sectional view of the sound receiving device according to the first embodiment.
- FIG. 4 is a cross-sectional view of the sound receiving device according to the second embodiment.
- FIG. 5 is a cross-sectional view of a sound receiving device according to a third embodiment.
- FIG. 6 is a cross-sectional view of another example of the sound receiving device according to the third embodiment.
- FIG. 7 is a cross-sectional view of another example of the sound receiving device according to the third embodiment.
- FIG. 8 is a cross-sectional view of the sound receiving device according to the fourth embodiment.
- FIG. 9 is a cross-sectional view of the sound receiving device according to the fifth embodiment.
- FIG. 10 is a cross-sectional view of a sound receiving device according to a sixth embodiment.
- FIG. 11 is a perspective view showing an appearance of a sound receiving device according to the second embodiment of the present invention.
- FIG. 12 is a cross-sectional view of a sound receiving device according to a seventh embodiment.
- FIG. 13 is a cross-sectional view of a sound receiving device according to an eighth embodiment.
- FIG. 14 is a cross-sectional view of a sound receiving device according to a ninth embodiment.
- FIG. 15 is a cross-sectional view of another example of the sound receiving device according to the ninth embodiment.
- FIG. 16 is a cross-sectional view of another example of the sound receiving device according to the ninth embodiment.
- FIG. 17 is a cross-sectional view of the sound receiving device according to the tenth embodiment.
- FIG. 18 is a cross-sectional view of the sound receiving device according to the eleventh embodiment.
- FIG. 19 is a cross-sectional view of the sound receiving device according to the twelfth embodiment.
- FIG. 20 is a graph showing a phase difference spectrum by a conventional sound receiving device.
- FIG. 21 is a graph showing a phase difference spectrum of the sound receiving device according to the first and second embodiments of the present invention.
- FIG. 22 is an explanatory diagram showing an application example of the sound receiving device according to the first and second embodiments of the present invention.
- FIG. 23 is an explanatory diagram showing an application example of the sound receiving device according to the first and second embodiments of the present invention.
- FIG. 24 is an explanatory view showing an application example of the sound receiving device according to the first and second embodiments of the present invention.
- FIG. 1 is a block diagram showing an audio processing device including the sound receiving device according to the first embodiment of the present invention.
- the audio processing device 100 includes a sound receiving device 101, a signal processing unit 102, and a speaker 103.
- the sound receiving device 101 includes a casing 110 and a microphone array 113 including a plurality of microphones 111 and 112 (two for simplicity in FIG. 2).
- the microphone arrays 11 3 are arranged at a predetermined interval d.
- the signal processing unit 102 estimates the sound of the target sound source.
- the signal processing unit 102 includes an in-phase circuit 121, an addition circuit 122, a sound source determination circuit 123, and a multiplication circuit 124 as a basic configuration.
- the in-phase circuit 121 in-phases the output signal from the microphone 112 with the output signal from the microphone 111.
- the adder circuit 122 adds the output signal from the microphone 111 and the output signal from the in-phase circuit 121.
- the sound source determination circuit 123 determines a sound source based on the output signal from the microphone array 113, and outputs a 1-bit determination result ("1" is a target sound source, and "0" is a noise source). )
- the multiplication circuit 124 multiplies the output signal from the addition circuit 122 and the determination result from the sound source determination circuit 123.
- the speaker 103 outputs a voice signal estimated by the signal processing unit 102, that is, a voice corresponding to the output signal from the multiplication circuit 124.
- FIG. 2 is a perspective view showing an appearance of the sound receiving device 101 shown in FIG.
- the housing 110 of the sound receiving device 101 has, for example, a rectangular parallelepiped shape.
- the housing 110 is formed of a sound absorbing member in which acrylic resin, silicon rubber, urethane, aluminum force is also selected, for example.
- the front surface 200 of the housing 110 is formed with a plurality (two in FIG. 2) of opening holes 201 and 202 corresponding to the number of microphones 111 and 112 (two in FIG. 2) constituting the microphone array 113. ing.
- the opening holes 201 and 202 are formed in a line along the longitudinal direction of the casing 101.
- the opening holes 201 and 202 are closed inside and do not penetrate the back surface 210.
- the microphone mouthphones 111 and 112 are disposed substantially at the centers of the opening holes 201 and 202 and are fixedly supported by the support member 220.
- the microphones 111 and 112 may be installed at desired positions from the openings 211 and 212 inside the opening holes 201 and 202.
- FIG. 3 is a cross-sectional view of the sound receiving device according to the first example. 3 is a cross-sectional view of the sound receiving device shown in FIG. It is an example of a figure.
- the same components as those shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
- the opening holes 201 and 202 have a substantially spherical shape, and sound waves are incident from the openings 211 and 212 formed in the front surface 200 of the housing 110.
- the shape of the opening holes 201 and 202 is not limited to a spherical shape, and may be a three-dimensional shape or a polyhedral shape with a random curved surface force. Sound waves with external force are incident only from the openings 211 and 212, and sound waves with other directional forces are not incident because they are shielded by the casing 110 formed of the sound absorbing member. Thereby, the directivity of the microphone array 113 can be improved.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference.
- the sound wave SWbi that reaches IJ on the inner peripheral walls 301 and 302 of the opening holes 201 and 202 is transmitted through the inner peripheral wall 301 of the opening holes 201 and 202 and is absorbed by the inner peripheral walls 301 and 302, or the inner peripheral walls 301 and 302 And is emitted from the opening holes 201 and 202.
- the sound reception of the sound wave SWb can be suppressed.
- the sound wave that arrives only from the predetermined direction is received, and the sound wave that arrives from a direction other than the predetermined direction is prevented from being received.
- the target sound wave can be detected with high accuracy, and a sound receiving device with high directivity can be realized.
- FIG. 4 is a cross-sectional view of the sound receiving device according to the second embodiment.
- the cross-sectional view shown in FIG. 4 is an example of the cross-sectional view of the sound receiving device 101 shown in FIG.
- the same components as those shown in FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof is omitted.
- the casing 110 is composed of a plurality (two in FIG. 4) of cells 411 and 412 made of sound absorbing members having different hardnesses for the microphones 111 and 112, respectively.
- the opening holes 201 and 202 are formed for each of the Senoles 411 and 412, and the microphones 111 and 112 are accommodated for each of the opening holes 201 and 202.
- the material of the cells 411 and 412 for example, the above-described acrylic resin, silicon rubber, urethane, and aluminum force are also selected.
- the cell 411 can be made of acrylic resin
- the other cell 412 can be made of silicon rubber.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave SWc (SWc 1, SWc 2) reaching the inner peripheral walls 301, 302 of the opening holes 201, 202 of the cells 41 1, 412 is reflected by the inner peripheral walls 301, 302 of the opening holes 201, 202.
- the phase of the sound wave SWcl reflected by the inner peripheral wall 301 of the opening hole 201 of one of the senole 411 changes according to the material of the one cell 411.
- the phase of the sound wave SWc 2 reflected by the inner peripheral wall 302 of the opening hole 202 of the other cell 412 changes depending on the material of the other cell 412. Since one cell 411 and the other cell 412 have different material hardness, the phase changes of the sound waves SWcl and SWc2 are also different. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and determined as noise by the sound source determination circuit 123 shown in FIG.
- the same operational effects as those of the first embodiment are obtained.
- the sound receiving device 101 with a simple configuration, it is possible to detect the sound of the target sound source, that is, the sound of the sound wave SWa with high accuracy by disturbing the phase difference of the sound wave SWc from an unnecessary direction, and the directivity is good! If the sound receiving device can be realized, the effect is achieved.
- FIG. 5 is a cross-sectional view of the sound receiving device according to the third embodiment.
- the cross-sectional view shown in FIG. 5 is an example of a cross-sectional view of the sound receiving device 101 shown in FIG.
- the same components as those shown in FIGS. 2 to 4 are denoted by the same reference numerals, and the description thereof is omitted.
- an inner peripheral wall 502 of the opening hole 202 is formed of a porous sound absorbing member 500 having a hardness different from that of the casing 110.
- the material of the sound absorbing member 500 constituting the casing 110 and the inner peripheral wall 502 for example, the above-described acrylic resin, silicon rubber, urethane, and aluminum cocoon are also selected.
- the material of the casing 110 is acrylic resin
- the material of the sound absorbing member 500 constituting the inner peripheral wall 502 is a material other than acrylic resin.
- silicon rubber is used.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave SWcl that has reached the inner peripheral wall 301 of one opening hole 201 is reflected by the inner peripheral wall 301 of the opening hole 201.
- the phase of the sound wave SWcl reflected by the inner peripheral wall 301 of one opening hole 201 changes depending on the material of the housing 110.
- the phase of the sound wave SWc 2 reflected by the inner peripheral wall 502 of the other opening hole 202 changes depending on the material of the sound absorbing member 500 constituting the other inner peripheral wall 502. Since the material of the casing 110 constituting the inner peripheral wall 301 of the one opening hole 201 and the material of the sound absorbing member 500 constituting the inner peripheral wall 502 of the other opening hole 202 are different in hardness, the phase change of the sound waves SWcl and SWc2 is changed. It will be different. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and determined as noise by the sound source determination circuit 123 shown in FIG.
- FIG. 6 is a cross-sectional view of another example of the sound receiving device 101 according to the third embodiment.
- inner peripheral walls 601 and 502 of both opening holes 201 and 202 are constituted by different sound absorbing members 600 and 500, respectively.
- the material of the sound absorbing member 600 is also selected from, for example, the above-mentioned acrylic resin, silicon rubber, urethane, and aluminum, as in the sound absorbing member 500.
- the material of the sound absorbing member 600 constituting the inner peripheral wall 601 is acrylic resin
- the material of the sound absorbing member 500 forming the inner peripheral wall 502 is a material other than acrylic resin, for example, Use silicone rubber.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave SWcl that has reached the inner peripheral wall 601 of one opening hole 201 is reflected by the inner peripheral wall 601 of one opening hole 201.
- the phase of the sound wave SWcl reflected by the inner peripheral wall 601 of the one opening hole 201 changes depending on the material of the casing 110.
- the phase of the sound wave SWc 2 reflected by the inner peripheral wall 502 of the other opening hole 202 changes depending on the material of the sound absorbing member 500 constituting the inner peripheral wall 502.
- the material of the sound absorbing member 600 constituting the inner peripheral wall 601 of one opening hole 201 and the inner peripheral wall 502 of the other opening hole 202 are configured. Since the material of the sound absorbing member 500 is different in hardness, the phase changes of the sound waves SWcl and SWc2 are also different. Accordingly, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and is determined to be noise by the sound source determination circuit 123 shown in FIG.
- FIG. 7 is a cross-sectional view of another example of the sound receiving device 101 according to the third embodiment.
- an inner peripheral wall 701 of one opening hole 201 is composed of a plurality (two types in the figure) of sound absorbing members 500 and 600.
- the inner peripheral wall 702 of the other opening hole 202 is also composed of a plurality of (two types in the figure) sound absorbing members 500, 600 force.
- the arrangement of the sound absorbing members 500 and 600 is different between the two opening holes 201 and 202.
- the surfaces of the sound absorbing members 500 (600) different from each other. Will be reflected.
- the phases of the sound waves SWcl and SWc2 reflected on the inner peripheral walls 701 and 702 can be changed more randomly. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and is determined to be noise by the sound source determination circuit 123 shown in FIG.
- the same operational effects as those of the first embodiment are obtained.
- the sound receiving device 101 with a simple configuration, it is possible to detect the sound of the target sound source, that is, the sound of the sound wave SWa with high accuracy by disturbing the phase difference of the sound wave SWc from an unnecessary direction, and the directivity is good! If the sound receiving device can be realized, the effect is achieved.
- FIG. 8 is a cross-sectional view of the sound receiving device according to the fourth embodiment.
- the cross-sectional view shown in FIG. 8 is an example of the cross-sectional view of the sound receiving device 101 shown in FIG. Note that the same reference numerals are given to the same components as those shown in FIG. 2, and the description thereof will be omitted.
- both opening holes 201 and 802 are formed in different shapes.
- one opening hole 201 has a substantially circular cross section, that is, a substantially spherical shape
- the other opening hole 802 has a substantially polygonal cross section, that is, a substantially polyhedral shape.
- the sound wave SWa that directly reaches the microphones 111 and 112 is shown in FIG. In this way, the microphones 111 and 112 receive sound directly with a predetermined phase difference.
- the sound wave SWcl that has reached the inner peripheral wall 301 of one opening hole 201 is reflected by the inner peripheral wall 301 of one opening hole 201 and received by the microphone 111.
- the sound wave SWc 2 that has reached the inner peripheral wall 812 of the other opening hole 802 is reflected by the inner peripheral wall 812 of the other opening hole 202 and received by the microphone 112.
- the opening holes 201 and 802 in the casing 110 have different shapes, the reflected path length of the sound wave SWcl and the reflected path length of the sound wave SWc2 are different path lengths. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and is determined as noise by the sound source determination circuit 123 shown in FIG.
- the same effects as those of the first embodiment are obtained.
- the sound receiving device 101 with a simple configuration, it is possible to detect the sound of the target sound source, that is, the sound wave SWa with high accuracy by disturbing the phase difference of the sound wave SWc with unnecessary directional force, especially by changing the shape of the opening hole. It is possible to achieve a highly sensitive sound receiving device with good directivity!
- FIG. 9 is a cross-sectional view of the sound receiving device according to the fifth embodiment.
- the sectional view shown in FIG. 9 is an example of the sectional view of the sound receiving device 101 shown in FIG. Note that the same reference numerals are given to the same components as those shown in FIG. 2, and the description thereof will be omitted.
- the opening holes 201 and 912 have the same shape.
- both opening holes 201, 912 have the same circular cross section, that is, a substantially spherical shape.
- the inner peripheral wall 301 that is the surface of the opening hole 201 is a smooth surface, while the inner peripheral wall 902 that is the surface of the opening hole 912 is formed with random irregularities (projections).
- the difference in level of the unevenness can be set to a protrusion that is not broken by the vibration of the force sound wave that can be set freely.
- the height difference is 2 [mm] -4 [mm], and more specifically, the height difference of 3 [mm] is preferable.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave SWcl that reaches the inner peripheral wall 301 of the opening hole 201 is reflected by the inner peripheral wall 301 of one opening hole 201 and received by the microphone 111.
- the sound wave SWc 2 that has reached the inner peripheral wall 902 of the other opening hole 912 is reflected by the inner peripheral wall 902 of the other opening hole 202 and is received by the microphone 112.
- the opening holes 201 and 912 in the casing 110 have different shapes, the reflected path length of the sound wave SWcl and the reflected path length of the sound wave SWc2 are different path lengths.
- the sound wave SWc generates a phase difference corresponding to the path difference between the reflection path length of the sound wave SWcl and the reflection path length of the sound wave SWc2. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and determined as noise by the sound source determination circuit 123 shown in FIG.
- both the opening holes 201 and 912 are formed in the same mold to have the same shape, and the inner peripheral wall 902 different from the inner peripheral wall 301 is formed by providing irregularities only on the surface of the opening hole 912.
- the sound receiving device can be easily created.
- the inner peripheral wall 301 has the same effect as the inner peripheral wall 902 even when random irregularities (projections) different from the inner peripheral wall 902 are formed.
- FIG. 10 is a cross-sectional view of the sound receiving device according to the sixth embodiment.
- the sectional view shown in FIG. 10 is an example of a sectional view of the sound receiving device 101 shown in FIG.
- the same components as those shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
- each of the opening holes 201 and 202 has the same substantially elliptical cross section, that is, a substantially elliptical spherical shape.
- the opening holes 201 and 202 are filled with a gel substance 1000.
- This Examples of the gel composition of the gel substance 1000 include gelatin gel, PVA (polypropyl alcohol) gel, and IPA (isopropyl acrylamide) gel.
- the gel-like substance 1000 reduces the propagation speed of sound waves to about 1Z4 compared to air.
- a hardened region 1001 and a soft region 1002 force S are formed randomly, and this region 1001, 1002 force S constitutes the inner peripheral wall of the opening holes 201, 202 .
- the hardness distribution of the gel-like substance 1000 on the inner peripheral wall differs for each of the opening holes 201 and 202.
- substantially centered microphones 111 and 112 for the respective openings 211 and 212 are provided. Since the gel-like substance 1000 is substantially flush with the front surface 200 of the housing 110, the microphones 111 and 112 are provided so as to be slightly embedded in the gel-like substance 1000. It comes to put out. That is, since the microphones 111 and 112 are fixedly supported by the gel-like material 1000, the structure is simplified and the number of parts is not required, as in the first to fifth embodiments. Can be reduced and manufacturing can be facilitated.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave SWc 1 that has reached the gel-like substance 1000 in the opening 211 propagates through the inside of the gel-like substance 1000 at a sound velocity of about 1Z4 of air and reaches, for example, the hardening region 1001.
- the sound wave SWcl reflects at the fixed end.
- the sound wave SWc2 that has reached the gel-like substance 1000 in the opening 212 propagates through the inside of the gel-like substance 1000 at a sound velocity of about 1Z4 of air and reaches, for example, the soft region 1002.
- the sound wave SWc2 is reflected at the free end.
- the sound wave SWc is randomly reflected at the fixed end or the free end depending on the region to be reflected, and therefore the phase difference changes randomly. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and is determined to be noise by the sound source determination circuit 123 shown in FIG.
- the same effects as those of the first embodiment are obtained.
- the opening holes 201 and 202 filled with the gel-like substance 1000 were filled.
- the propagation speed of the sound wave in the gel-like substance 1000 can be reduced by about 1Z4 from air.
- the size of the casing 110 can be reduced to about 1Z4 and the phase difference of the reflected sound wave SWc can be changed randomly as compared with the case where the inside of the opening holes 201 and 202 is air. There is an effect.
- the phase of the reflected sound wave SWc can be randomly changed by filling the opening holes 201 and 202 with the gel substance 1000 to form an inner peripheral wall with a random hardness distribution.
- the sound of the target sound source that is, the sound of the sound wave SWa
- the composition distribution of the gel substance 1000 is different, the sound wave SWc is irregularly reflected and the phase changes randomly, so the gel composition itself may be the same on the left and right! /.
- the voice processing device according to the first embodiment described above includes the sound receiving device 101 having a plurality of (two in the figure) opening holes, but the voice processing device according to the second embodiment is a single unit. A sound receiving device having an opening hole is provided.
- the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.
- FIG. 11 is a perspective view showing the appearance of a sound receiving device according to the second embodiment of the present invention.
- a single opening hole 1100 is formed in the front surface 200 of the housing 110.
- the opening hole 1100 is closed inside and does not penetrate the back surface 210.
- the microphones 111 and 112 are arranged at predetermined intervals d in the longitudinal direction of the housing 110 in the opening hole 1100 and fixedly supported by the support member 220.
- the microphones 111 and 112 may be installed at desired positions from the opening 1110 inside the opening hole 1100. Examples 7-12 of the sound receiving device 101 according to the second embodiment of the present invention will be described below with reference to FIGS. 12-19.
- FIG. 12 is a cross-sectional view of the sound receiving device according to the seventh embodiment.
- 12 is a cross-sectional view of the sound receiving device 10 shown in FIG. 1 is an example of a sectional view of 1.
- an opening hole 1100 has a substantially elliptical cross section, that is, a substantially elliptical sphere shape, and a sound wave enters from an opening 1110 formed in the front surface 200 of the housing 110.
- the shape of the opening hole 1100 is not limited to a substantially elliptical sphere shape, and may be a three-dimensional shape or a polyhedral shape including a random curved surface. Sound waves from the outside are incident only through the opening 1110, and sound waves from other directions are not incident because they are shielded by the casing 110 formed of the sound absorbing member. Thereby, the directivity of the microphone array 113 can be improved.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference.
- the sound wave SWb that reaches the inner peripheral wall 1201 of the opening hole 1100 passes through the inner peripheral wall 1201 of the opening hole 1100 and is absorbed by the inner peripheral wall 1201 or reflected by the inner peripheral wall 1201 and emitted from the opening hole 110. Is done. Thereby, the reception of the sound wave SWb can be suppressed.
- the sound receiving device 101 receives sound waves that arrive only from a predetermined direction, and prevents sound waves that arrive from directions other than the predetermined direction. As a result, the target sound wave can be detected with high accuracy, and an effect is obtained that a sound receiving device with high directivity can be realized.
- FIG. 13 is a cross-sectional view of the sound receiving device according to the eighth embodiment.
- the cross-sectional view shown in FIG. 13 is an example of the cross-sectional view of the sound receiving device 101 shown in FIG.
- the same components as those shown in FIGS. 2 and 12 are denoted by the same reference numerals, and the description thereof is omitted.
- the housing 110 is composed of a plurality (two in FIG. 13) of cells 1311, 1312 having a sound absorbing member force having different hardness for each of the microphones 111, 112.
- the opening hole 1 100 is formed for each of the senoules 1311, 1312.
- the material of Senole 1311, 1312 is selected from the above-mentioned acrylic resin, silicon rubber, urethane, and aluminum power. Concrete Specifically, for example, the material of one cell 1311 is acrylic resin, and the material of the other cell 1312 is silicon rubber.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference.
- the sound waves SWc (SWc 1 and SWc 2) that have reached the inner peripheral walls 1301 and 1302 of the cells 13 11 and 1312 are reflected by the inner peripheral walls 1301 and 1302.
- the phase of the sound wave SWc 1 reflected by the inner peripheral wall 1301 of one senor 1311 changes according to the material of the one cell 1311.
- the phase of the sound wave SWc2 reflected by the inner peripheral wall 1302 of the other cell 1312 changes depending on the material of the other cell 1312. Since one cell 1311 and the other cell 1312 have different material hardness, the phase changes of the sound waves SWcl and SWc2 are also different. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and determined as noise by the sound source determination circuit 123 shown in FIG.
- the same operational effects as those of the first embodiment are obtained.
- the sound receiving device 101 with a simple configuration, it is possible to detect the sound of the target sound source, that is, the sound of the sound wave SWa with high accuracy by disturbing the phase difference of the sound wave SWc from an unnecessary direction, and the directivity is good! If the sound receiving device can be realized, the effect is achieved.
- FIG. 14 is a cross-sectional view of the sound receiving device according to the ninth embodiment.
- the cross-sectional view shown in FIG. 14 is an example of a cross-sectional view of the sound receiving device 101 shown in FIG.
- the same components as those shown in FIGS. 2, 12, and 13 are denoted by the same reference numerals, and the description thereof is omitted.
- the inner peripheral wall 1402 of the opening hole 1100 is formed of a sound absorbing member 1400 having a hardness different from that of the casing 110.
- the material of the sound absorbing member 1400 constituting the casing 110 and the inner peripheral wall 1402 is selected from, for example, the above-mentioned acrylic resin, silicon rubber, urethane, and aluminum.
- the material of the sound absorbing member 1400 constituting the inner peripheral wall 1402 is material other than acrylic ⁇ , for example a silicone rubber n
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave SWcl that has reached the inner peripheral wall 1201 of the casing 110 is reflected by the inner peripheral wall 1201.
- the phase of the sound wave SWcl reflected by the inner peripheral wall 1201 changes according to the material of the casing 110.
- the phase of the sound wave SWc 2 reflected by the inner peripheral wall 1402 changes depending on the material of the sound absorbing member 1400 constituting the inner peripheral wall 1402. Since the material of the casing 110 that forms the inner peripheral wall 1201 and the material of the sound absorbing member 1400 that forms the inner peripheral wall 1402 are different in hardness, the phase changes of the sound waves SWcl and SWc2 are also different. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and is determined as noise by the sound source determination circuit 123 shown in FIG.
- FIG. 15 is a cross-sectional view showing another example of the sound receiving device 101 that works on the ninth embodiment.
- the inner peripheral walls 1501 and 1402 of the opening hole 1100 are composed of sound absorbing members 1500 and 1400 having different hardnesses.
- the material of the sound absorbing member 1500 is the same as that of the sound absorbing member 1400.
- the above-mentioned acrylic resin, silicon rubber, urethane, and aluminum force are also selected.
- the material of the sound absorbing member 1500 constituting the inner peripheral wall 1501 is acrylic resin
- the material of the sound absorbing member 1400 forming the inner peripheral wall 1402 is a material other than acrylic resin, for example, Use silicone rubber.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave SWcl that has reached the inner peripheral wall 1501 is reflected by the inner peripheral wall 1501.
- the phase of the sound wave SWc 1 reflected by the inner peripheral wall 1501 changes according to the material of the sound absorbing member 1500 constituting the inner peripheral wall 1501.
- the phase of the sound wave SWc2 reflected by the inner peripheral wall 1402 changes depending on the material of the sound absorbing member 1400 constituting the inner peripheral wall 1402. Since the material of the sound absorbing member 1500 constituting the inner peripheral wall 1501 is different from the material of the sound absorbing member 1400 constituting the inner peripheral wall 1402, the sound wave S The phase change of Wcl and SWc2 will also be different. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and determined as noise by the sound source determination circuit 123 shown in FIG.
- FIG. 16 is a cross-sectional view showing another example of the sound receiving device 101 that works on the ninth embodiment.
- the inner peripheral wall 160 0 (1601, 1602) is composed of a plurality (two types in the figure) of sound absorbing members 1400, 1500.
- the arrangement and area size of the sound absorbing members 1400 and 1500 are random, the arrangement and area size of the inner peripheral walls 1601 and 1602 are random. Therefore, when the same sound wave arrives, it is reflected by the surfaces of different sound absorbing members 1400 (1500). From this, both the inner peripheral walls 1601, 1602 [koo! /, And the reflected sound waves SWcl, SWc2 can be changed more randomly. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and is determined to be noise by the sound source determination circuit 123 shown in FIG.
- the same effects as those of the first embodiment are obtained.
- the sound receiving device 101 with a simple configuration, it is possible to detect the sound of the target sound source, that is, the sound of the sound wave SWa with high accuracy by disturbing the phase difference of the sound wave SWc from an unnecessary direction, and the directivity is good! If the sound receiving device can be realized, the effect is achieved.
- FIG. 17 is a cross-sectional view of the sound receiving device according to the tenth embodiment.
- the sectional view shown in FIG. 17 is an example of the sectional view of the sound receiving device 101 shown in FIG.
- the same components as those shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
- the left half and the right half of the opening hole 1100 are configured in different shapes.
- the left half of the opening hole 1100 has a substantially circular cross section, that is, a substantially spherical shape
- the right half of the opening hole 1100 has a substantially polygonal cross section, that is, a substantially polyhedral shape.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave SWcl that has reached the inner peripheral wall 1701 of the left half of the opening hole 1100 is reflected by the inner peripheral wall 1701 and received by the microphone 111.
- the sound wave SWc2 that has reached the inner peripheral wall 1702 on the right half of the opening hole 1100 is reflected by the inner peripheral wall 1702 and received by the microphone 112.
- the reflection path length of the sound wave SWcl and the reflection path length of the sound wave SWc2 are different path lengths.
- the sound wave SWc generates a phase difference corresponding to the path difference between the reflection path length of the sound wave SWcl and the reflection path length of the sound wave SWc2. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and determined as noise by the sound source determination circuit 123 shown in FIG.
- the same operational effects as those of the seventh embodiment are obtained.
- the sound receiving device 101 with a simple configuration, it is possible to detect the sound of the target sound source, that is, the sound of the sound wave SWa with high accuracy by disturbing the phase difference of the sound wave SWc of the unnecessary directional force, especially by changing the shape of the opening hole. It is possible to achieve a highly sensitive sound receiving device with good directivity!
- FIG. 18 is a cross-sectional view of the sound receiving device according to the eleventh embodiment.
- the cross-sectional view shown in FIG. 18 is an example of the cross-sectional view of the sound receiving device shown in FIG.
- the same components as those shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
- the opening hole 1100 has a substantially circular cross section, that is, a substantially spherical shape.
- the inner peripheral wall 1701 that is the surface of the left half of the opening hole 1100 is a smooth surface, while the inner peripheral wall 1802 that is the surface of the right half of the opening hole 1100 is formed with random irregularities (projections).
- the height difference of the irregularities can be set freely, but it is sufficient to make the protrusions so as not to be broken by sound wave vibration. Actually, the height difference is 2 [mm] —4 [mm], more specific The height difference of 3 [mm] is preferred.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave S Wc enters the opening hole 1100.
- the sound wave SWcl that has reached the inner peripheral wall 1701 is reflected by the inner peripheral wall 1701 and received by the microphone 111.
- the sound wave SWc 2 that has reached the inner peripheral wall 1802 of the right half of the opening hole 1100 is reflected by the inner peripheral wall 180 2 and received by the microphone 112.
- the inner peripheral walls 1701 and 1802 in the opening hole 1100 have different surface shapes, the reflection path length of the sound wave SWcl and the reflection path length of the sound wave SWc2 are different.
- the sound wave SWc generates a phase difference corresponding to the path difference between the reflection path length of the sound wave SWcl and the reflection path length of the sound wave SWc2. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and determined as noise by the sound source determination circuit 123 shown in FIG.
- Example 11 by forming irregularities only on the surface of the right half of the opening hole 1100, an inner peripheral wall 1802 having a surface shape different from that of the inner peripheral wall 1701 of the left half of the opening hole 1100 can be formed. There is an effect that the device 101 can be easily created. Also, the inner peripheral wall 1701 has the same effect as the inner peripheral wall 1802 even if random irregularities (projections) different from the inner peripheral wall 1802 are formed.
- FIG. 19 is a cross-sectional view of the sound receiving device according to the twelfth embodiment.
- the cross-sectional view shown in FIG. 19 is an example of a cross-sectional view of the sound receiving device 101 shown in FIG.
- the same components as those shown in FIG. Description is omitted.
- the opening hole 1100 has a substantially elliptical cross section, that is, a substantially elliptical sphere shape.
- the opening hole 1100 is filled with a gel substance 1000.
- the gel composition of the gel-like substance 100 include gelatin gel, PVA (polybutyl alcohol) gel, and IPA (isopropyl acrylamide) gel.
- the gel-like substance 1000 reduces the propagation speed of the sound wave to about 1Z4 compared to air.
- the boundary between the opening hole 1100 and the gel-like substance 1000 is formed at random in the hardening region 1001 and the soft region 1002 force S, and these regions 1001 and 1002 constitute the inner peripheral wall of the opening hole 1100. Thereby, the hardness distribution of the gel-like substance 1000 on the inner peripheral wall is different.
- microphones 111 and 112 are provided at substantially the center of the opening 1110. Since the gel substance 1000 is substantially flush with the front surface 200 of the housing 110, the microphones 111 and 112 are provided so as to be slightly embedded in the gel substance 1000. It comes to put out. That is, since the microphones 111 and 112 are fixedly supported by the gel-like substance 1000, the structure that does not require the use of the support member 220 as in the above Examples 7-11, the number of parts, This makes it easier to manufacture.
- the sound wave SWa that directly reaches the microphones 111 and 112 is directly received by the microphones 111 and 112 with a predetermined phase difference, as shown in FIG.
- the sound wave SWc 1 that has reached the gel-like substance 1000 in the opening 211 propagates through the inside of the gel-like substance 1000 at a sound velocity of about 1Z4 of air and reaches, for example, the hardening region 1001.
- the sound wave SWcl reflects at the fixed end.
- the sound wave SWc2 that has reached the gel-like substance 1000 in the opening 1110 propagates through the inside of the gel-like substance 1000 at a sound velocity of about 1Z4 of air and reaches, for example, the soft region 1002.
- the sound wave SWc2 is reflected at the free end.
- the sound wave SWc is randomly reflected at the fixed end or the free end depending on the region to be reflected, so that the phase difference changes randomly. Therefore, the sound wave SWc is received by the microphones 111 and 112 with a phase difference different from the phase difference of the sound wave SWa, and is determined to be noise by the sound source determination circuit 123 shown in FIG.
- Example 12 by filling the opening 1100 with the gel material 1000, the propagation speed of the sound wave in the gel material 1000 can be reduced by about 1Z4 compared to the air. Therefore, the size of the housing 110 can be reduced to about 1Z4 and the phase difference of the reflected sound wave SWc can be changed randomly compared to the case where the inside of the opening hole 1100 is air. There is an effect.
- FIG. 20 is a graph showing a phase difference spectrum by a conventional sound receiving device
- FIG. 21 is a graph showing a phase difference spectrum of the sound receiving device according to the first and second embodiments of the present invention.
- the vertical axis is the phase difference (D)
- the horizontal axis is the frequency of the received sound wave (0 – 5.5 [kHz]).
- the dotted line is a theoretical straight line.
- the phase difference spectrum waveform 2000 shown in FIG. 20 has a large difference from the theoretical line, but the phase difference spectrum waveform 2100 shown in FIG. The difference from the theoretical line is small. Therefore, in the sound receiving device according to the first and second embodiments of the present invention, the sound wave of the target sound source power can be received with high accuracy, and the sound from the noise source can be removed.
- FIG. 22 to 24 are explanatory diagrams showing application examples of the sound receiving device according to the first and second embodiments of the present invention.
- FIG. 22 shows an example applied to a video camera.
- the sound receiving device 101 is built in the video power camera 2200, and the front surface 200 and the slit plate portion 2201 come into contact with each other.
- FIG. 23 shows an example applied to a wristwatch.
- the sound receiving device 101 is built in both the left and right ends of the watch panel of the wristwatch 2300, and the front face 200 and the slit plate portion 2301 come into contact with each other.
- FIG. 24 shows an example applied to a mobile phone.
- the sound receiving device 101 is built in the transmitter of the mobile phone 2400, and the front surface 200 and the slit plate portion 2401 come into contact with each other. As a result, it is possible to accurately receive the sound wave having the target sound source power.
- microphones 111 and 112 are arranged in a row, but they may be arranged two-dimensionally according to the environment and apparatus to which sound receiving device 101 is applied. .
- the microphones 111 and 112 applied to the first and second embodiments are preferably omnidirectional microphones. Thereby, an inexpensive sound receiving device can be provided.
- the sound receiving device is useful for a microphone array used in a predetermined closed space such as a room or in a car, and in particular, a video conference, a working robot in a factory, a video camera, a wristwatch. Suitable for mobile phones.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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KR1020077015910A KR100936684B1 (ko) | 2005-01-13 | 2005-01-13 | 음 수신 장치 |
PCT/JP2005/000316 WO2006075377A1 (ja) | 2005-01-13 | 2005-01-13 | 受音装置 |
CN2005800464984A CN101099409B (zh) | 2005-01-13 | 2005-01-13 | 声音接收装置 |
JP2006552802A JP4806638B2 (ja) | 2005-01-13 | 2005-01-13 | 受音装置 |
EP05703555.2A EP1838131B1 (en) | 2005-01-13 | 2005-01-13 | Sound receiver |
US11/826,350 US8315418B2 (en) | 2005-01-13 | 2007-07-13 | Sound receiver |
Applications Claiming Priority (1)
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PCT/JP2005/000316 WO2006075377A1 (ja) | 2005-01-13 | 2005-01-13 | 受音装置 |
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US11/826,350 Continuation US8315418B2 (en) | 2005-01-13 | 2007-07-13 | Sound receiver |
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US (1) | US8315418B2 (ja) |
EP (1) | EP1838131B1 (ja) |
JP (1) | JP4806638B2 (ja) |
KR (1) | KR100936684B1 (ja) |
CN (1) | CN101099409B (ja) |
WO (1) | WO2006075377A1 (ja) |
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JP2009118503A (ja) * | 2008-12-25 | 2009-05-28 | Funai Electric Advanced Applied Technology Research Institute Inc | 音声入力装置及びその製造方法、並びに、情報処理システム |
JP2009135594A (ja) * | 2007-11-28 | 2009-06-18 | Panasonic Electric Works Co Ltd | 音響入力装置 |
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WO2010047363A1 (ja) * | 2008-10-22 | 2010-04-29 | ヤマハ株式会社 | 音響装置 |
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JP2014090353A (ja) * | 2012-10-31 | 2014-05-15 | Nippon Telegr & Teleph Corp <Ntt> | 音源位置推定装置 |
JP2014143571A (ja) * | 2013-01-24 | 2014-08-07 | Nippon Telegr & Teleph Corp <Ntt> | 収音装置及び再生装置 |
JP2015198412A (ja) * | 2014-04-03 | 2015-11-09 | 日本電信電話株式会社 | 変換装置 |
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JP5045929B2 (ja) * | 2008-01-17 | 2012-10-10 | ティアック株式会社 | ポータブル録音装置 |
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US9264524B2 (en) | 2012-08-03 | 2016-02-16 | The Penn State Research Foundation | Microphone array transducer for acoustic musical instrument |
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WO2010047363A1 (ja) * | 2008-10-22 | 2010-04-29 | ヤマハ株式会社 | 音響装置 |
US8761413B2 (en) | 2008-10-22 | 2014-06-24 | Yamaha Corporation | Audio apparatus with circularly arranged microphones |
JP2009118503A (ja) * | 2008-12-25 | 2009-05-28 | Funai Electric Advanced Applied Technology Research Institute Inc | 音声入力装置及びその製造方法、並びに、情報処理システム |
JP2014090353A (ja) * | 2012-10-31 | 2014-05-15 | Nippon Telegr & Teleph Corp <Ntt> | 音源位置推定装置 |
JP2014143571A (ja) * | 2013-01-24 | 2014-08-07 | Nippon Telegr & Teleph Corp <Ntt> | 収音装置及び再生装置 |
JP2015198412A (ja) * | 2014-04-03 | 2015-11-09 | 日本電信電話株式会社 | 変換装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1838131B1 (en) | 2017-06-28 |
EP1838131A1 (en) | 2007-09-26 |
CN101099409B (zh) | 2011-05-18 |
US20080019551A1 (en) | 2008-01-24 |
US8315418B2 (en) | 2012-11-20 |
EP1838131A4 (en) | 2011-05-11 |
KR20070094776A (ko) | 2007-09-21 |
JP4806638B2 (ja) | 2011-11-02 |
JPWO2006075377A1 (ja) | 2008-06-12 |
KR100936684B1 (ko) | 2010-01-13 |
CN101099409A (zh) | 2008-01-02 |
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