CA2629801A1 - Remote conference apparatus and sound emitting/collecting apparatus - Google Patents
Remote conference apparatus and sound emitting/collecting apparatus Download PDFInfo
- Publication number
- CA2629801A1 CA2629801A1 CA002629801A CA2629801A CA2629801A1 CA 2629801 A1 CA2629801 A1 CA 2629801A1 CA 002629801 A CA002629801 A CA 002629801A CA 2629801 A CA2629801 A CA 2629801A CA 2629801 A1 CA2629801 A1 CA 2629801A1
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- sound
- sound collecting
- signal
- collecting
- signals
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Classifications
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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
- 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
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
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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
- 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
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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
- 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
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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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
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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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/03—Synergistic effects of band splitting and sub-band processing
-
- 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
Abstract
A teleconference device includes a loudspeaker array and microphone arrays arranged at the both sides of the loudspeaker array. A plurality of focal points are set in front of the respective microphone arrays and symmetrically with respect to the center line of the loudspeaker array. A flux of sound collection beams toward the focal points is outputted. By calculating a difference between the sound collection beams toward the focal points symmetric with respect to the center line, a sound component coming into the microphone from the loudspeaker array SPA is cancelled. Furthermore, a total of squares of wave height value of the difference value for a particular time is used to estimate which of the set focal points is the nearest. Furthermore, by comparing the totals of squares of the wave height values of the sound collection beams toward the focal points symmetric to each other, it is possible to judge the position of the speaker.
Claims (7)
1. A remote conference apparatus, comprising:
a speaker array, including a plurality of speakers, which emit a sound upward or downward;
a first microphone array and a second microphone array which are provided to pick up the sounds from both sides of the speaker array in a longitudinal direction of the speaker array;
a first beam generating portion which generates a plurality of first sound collecting beams, the first sound collecting beams placing focal points on a plurality of first sound collecting areas decided previously In the first microphone array side respectively, by applying delay processes to sound signals that microphones of the first microphone array pick up respectively with a predetermined amount of delay respectively and synthesizing delayed sound signals;
a second beam generating portion which generates a plurality of second sound collecting beams, the second sound collecting beams placing focal points on a plurality of second sound collecting areas decided previously in the second microphone array side respectively, by applying delay processes to sound signals that microphones of the second microphone array pick up respectively with a predetermined amount of delay respectively and synthesizing delayed sound signals;
a difference signal calculating portion which calculates difference signals of the sound collecting beams, that correspond to pairs of sound collecting areas in mutually symmetrical positions with respect to a centerline of the speaker array in the longitudinal direction, out of the sound collecting beams that are generated toward the plurality of first sound collecting areas and the plurality of second sound collecting areas, respectively;
a first sound source position estimating portion which selects a pair of sound collecting areas in which a signal strength of the difference signal is large; and a second sound source position estimating portion which selects a sound collecting area corresponding to the sound collecting beam whose strength is larger from the pair of sound collecting areas selected by the first sound source position estimating portion to estimate that a sound source position is present in the selected sound collecting area.
a speaker array, including a plurality of speakers, which emit a sound upward or downward;
a first microphone array and a second microphone array which are provided to pick up the sounds from both sides of the speaker array in a longitudinal direction of the speaker array;
a first beam generating portion which generates a plurality of first sound collecting beams, the first sound collecting beams placing focal points on a plurality of first sound collecting areas decided previously In the first microphone array side respectively, by applying delay processes to sound signals that microphones of the first microphone array pick up respectively with a predetermined amount of delay respectively and synthesizing delayed sound signals;
a second beam generating portion which generates a plurality of second sound collecting beams, the second sound collecting beams placing focal points on a plurality of second sound collecting areas decided previously in the second microphone array side respectively, by applying delay processes to sound signals that microphones of the second microphone array pick up respectively with a predetermined amount of delay respectively and synthesizing delayed sound signals;
a difference signal calculating portion which calculates difference signals of the sound collecting beams, that correspond to pairs of sound collecting areas in mutually symmetrical positions with respect to a centerline of the speaker array in the longitudinal direction, out of the sound collecting beams that are generated toward the plurality of first sound collecting areas and the plurality of second sound collecting areas, respectively;
a first sound source position estimating portion which selects a pair of sound collecting areas in which a signal strength of the difference signal is large; and a second sound source position estimating portion which selects a sound collecting area corresponding to the sound collecting beam whose strength is larger from the pair of sound collecting areas selected by the first sound source position estimating portion to estimate that a sound source position is present in the selected sound collecting area.
2. The remote conference apparatus according to claim 1, wherein the first beam generating portion and the second beam generating portion set further a plurality of narrow sound collecting areas in the sound collecting area which is selected by the second sound source position estimating portion to generate a plurality of narrow sound collecting beams that place a focal point on the narrow sound collecting areas respectively, and the remote conference apparatus further comprising:
a third sound source position estimating portion which estimates that a sound source position is present in an area of the sound collecting beam in which a strength of the sound signal is large, out of the sound collecting beams corresponding to the plurality of narrow sound collecting areas.
a third sound source position estimating portion which estimates that a sound source position is present in an area of the sound collecting beam in which a strength of the sound signal is large, out of the sound collecting beams corresponding to the plurality of narrow sound collecting areas.
3. A remote conference apparatus, comprising:
a speaker array, including a plurality of speakers, which emit a sound upward or downward;
a first microphone array and a second microphone array which are adapted to align a plurality of microphones mutually symmetrically on both sides of a centerline of the speaker array in a longitudinal direction of the speaker array;
a difference signal calculating portion which calculates difference signals by subtracting sound signals picked up by respective microphones of the first and second microphone arrays every pair of microphones positioned mutually in symmetrical positions;
a first beam generating portion which generates a plurality of first sound collecting beams that place focal points on a plurality of pairs of predetermined sound collecting areas in mutual symmetrical positions respectively, by synthesizing the difference signals mutually while adjusting an amount of delay;
a first sound source position estimating portion which selects a pair of sound collecting areas in which a signal strength of the difference signal is large, out of the plurality of pairs of sound collecting areas;
a second beam generating portion which generates a sound collecting beam to pick up the sound signal from each sound collecting area in the pair of sound collecting areas that is selected by the first sound source position estimating portion, based on the sound signal picked up by each microphone of the first microphone array;
a third beam generating portion which generates a sound collecting beam to pick up the sound signal from each sound collecting area in the pair of sound collecting areas selected by the first sound source position estimating portion, based on the sound signal picked up by each microphone of the second microphone array; and a second sound source position estimating portion which selects a sound collecting area corresponding to a sound signal whose signal strength is larger out of the sound signals picked up by the sound collecting beams that the second and third beam generating portions generate to estimate that a sound source position is present in the selected sound collecting area.
a speaker array, including a plurality of speakers, which emit a sound upward or downward;
a first microphone array and a second microphone array which are adapted to align a plurality of microphones mutually symmetrically on both sides of a centerline of the speaker array in a longitudinal direction of the speaker array;
a difference signal calculating portion which calculates difference signals by subtracting sound signals picked up by respective microphones of the first and second microphone arrays every pair of microphones positioned mutually in symmetrical positions;
a first beam generating portion which generates a plurality of first sound collecting beams that place focal points on a plurality of pairs of predetermined sound collecting areas in mutual symmetrical positions respectively, by synthesizing the difference signals mutually while adjusting an amount of delay;
a first sound source position estimating portion which selects a pair of sound collecting areas in which a signal strength of the difference signal is large, out of the plurality of pairs of sound collecting areas;
a second beam generating portion which generates a sound collecting beam to pick up the sound signal from each sound collecting area in the pair of sound collecting areas that is selected by the first sound source position estimating portion, based on the sound signal picked up by each microphone of the first microphone array;
a third beam generating portion which generates a sound collecting beam to pick up the sound signal from each sound collecting area in the pair of sound collecting areas selected by the first sound source position estimating portion, based on the sound signal picked up by each microphone of the second microphone array; and a second sound source position estimating portion which selects a sound collecting area corresponding to a sound signal whose signal strength is larger out of the sound signals picked up by the sound collecting beams that the second and third beam generating portions generate to estimate that a sound source position is present in the selected sound collecting area.
4. A sound emitting/collecting apparatus, comprising:
a speaker which emits sounds in directions that are symmetrical with respect to a predetermined reference surface respectively;
a first microphone array which picks up the sound on one side of the predetermined reference surface, and a second microphone array which picks up the sound on other side of the predetermined reference surface;
a sound collecting beam signal generating portion which generates first sound collecting beam signals to pick up the sounds from a plurality of first sound collecting areas based on a sound collecting signal of the first microphone array respectively, and second sound collecting beam signals to pick up the sounds from a plurality of second sound collecting areas provided in symmetrical positions to the first sound collecting areas with respect to the predetermined reference surface based on a sound collecting signal of the second microphone array respectively; and a sound collecting beam signal selecting portion which subtracts the sound collecting beam signals to each other that are symmetrical mutually with respect to the predetermined reference surface, extracts only high-frequency components from two sound collecting beam signals constituting a difference signal whose signal level is highest, and selects one sound collecting beam signal having high-frequency component whose signal level is higher out of the two sound collection beam signals based on a result of the extracted high-frequency components,
a speaker which emits sounds in directions that are symmetrical with respect to a predetermined reference surface respectively;
a first microphone array which picks up the sound on one side of the predetermined reference surface, and a second microphone array which picks up the sound on other side of the predetermined reference surface;
a sound collecting beam signal generating portion which generates first sound collecting beam signals to pick up the sounds from a plurality of first sound collecting areas based on a sound collecting signal of the first microphone array respectively, and second sound collecting beam signals to pick up the sounds from a plurality of second sound collecting areas provided in symmetrical positions to the first sound collecting areas with respect to the predetermined reference surface based on a sound collecting signal of the second microphone array respectively; and a sound collecting beam signal selecting portion which subtracts the sound collecting beam signals to each other that are symmetrical mutually with respect to the predetermined reference surface, extracts only high-frequency components from two sound collecting beam signals constituting a difference signal whose signal level is highest, and selects one sound collecting beam signal having high-frequency component whose signal level is higher out of the two sound collection beam signals based on a result of the extracted high-frequency components,
5. The sound emitting/collecting apparatus according to claim 4, wherein the sound collecting beam signal selecting portion includes:
a difference signal detecting portion which subtracts the sound collecting beam signals to each other that are symmetrical mutually to detect a difference signal whose signal level is highest;
a high-frequency component signal extracting portion which has high-pass filters that pass only high-frequency components of two sound collecting beam signals from which the difference signal is detected by the difference signal detecting portion respectively, and detects the high-frequency component signal whose signal level is higher from the high-frequency component signals that passed through the high-pass filters; and a selecting portion which selects the sound collecting beam signal corresponding to the high-frequency component signal detected by the high-frequency component signal extracting portion, and outputs the selected sound collecting beam signal.
a difference signal detecting portion which subtracts the sound collecting beam signals to each other that are symmetrical mutually to detect a difference signal whose signal level is highest;
a high-frequency component signal extracting portion which has high-pass filters that pass only high-frequency components of two sound collecting beam signals from which the difference signal is detected by the difference signal detecting portion respectively, and detects the high-frequency component signal whose signal level is higher from the high-frequency component signals that passed through the high-pass filters; and a selecting portion which selects the sound collecting beam signal corresponding to the high-frequency component signal detected by the high-frequency component signal extracting portion, and outputs the selected sound collecting beam signal.
6. The sound emitting/collecting apparatus according to claim 4 or 5, wherein the speaker is constructed by a plurality of separate speakers aligned linearly along the predetermined reference surface.
7. The sound emitting/collecting apparatus according to any one of claims 4 to 6, further comprising:
a detouring sound removing portion which executes control such that the sound emitted from the speaker is not contained in the output sound signal, based on the input sound signal and the sound collecting beam signal selected by the sound collecting beam signal selecting portion.
a detouring sound removing portion which executes control such that the sound emitted from the speaker is not contained in the output sound signal, based on the input sound signal and the sound collecting beam signal selected by the sound collecting beam signal selecting portion.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005330730A JP4929685B2 (en) | 2005-11-15 | 2005-11-15 | Remote conference equipment |
| JP2005-330730 | 2005-11-15 | ||
| JP2006074848A JP5028833B2 (en) | 2006-03-17 | 2006-03-17 | Sound emission and collection device |
| JP2006-074848 | 2006-03-17 | ||
| PCT/JP2006/322488 WO2007058130A1 (en) | 2005-11-15 | 2006-11-10 | Teleconference device and sound emission/collection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2629801A1 true CA2629801A1 (en) | 2007-05-24 |
| CA2629801C CA2629801C (en) | 2011-02-01 |
Family
ID=38048516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2629801A Expired - Fee Related CA2629801C (en) | 2005-11-15 | 2006-11-10 | Remote conference apparatus and sound emitting/collecting apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8135143B2 (en) |
| EP (1) | EP1971183A1 (en) |
| CA (1) | CA2629801C (en) |
| WO (1) | WO2007058130A1 (en) |
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- 2006-11-10 EP EP06823310A patent/EP1971183A1/en not_active Withdrawn
- 2006-11-10 US US12/093,849 patent/US8135143B2/en not_active Expired - Fee Related
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| WO2007058130A1 (en) | 2007-05-24 |
| US8135143B2 (en) | 2012-03-13 |
| US20090052688A1 (en) | 2009-02-26 |
| CA2629801C (en) | 2011-02-01 |
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