WO2008047804A1 - Dispositif de conférence audio et système de conférence audio - Google Patents

Dispositif de conférence audio et système de conférence audio Download PDF

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Publication number
WO2008047804A1
WO2008047804A1 PCT/JP2007/070195 JP2007070195W WO2008047804A1 WO 2008047804 A1 WO2008047804 A1 WO 2008047804A1 JP 2007070195 W JP2007070195 W JP 2007070195W WO 2008047804 A1 WO2008047804 A1 WO 2008047804A1
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WO
WIPO (PCT)
Prior art keywords
sound
audio
sound collection
unit
microphone
Prior art date
Application number
PCT/JP2007/070195
Other languages
English (en)
Japanese (ja)
Inventor
Toshiaki Ishibashi
Ryo Tanaka
Satoshi Ukai
Original Assignee
Yamaha Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yamaha Corporation filed Critical Yamaha Corporation
Priority to CN2007800321284A priority Critical patent/CN101513056B/zh
Publication of WO2008047804A1 publication Critical patent/WO2008047804A1/fr

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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
    • H04R27/00—Public address systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H04M3/568—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants
    • H04M3/569—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants using the instant speaker's algorithm
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/50—Aspects of automatic or semi-automatic exchanges related to audio conference
    • H04M2203/5072—Multiple active speakers

Definitions

  • the present invention relates to an audio conference apparatus and an audio conference system that detect a speaker direction using sound collected from a microphone array including a plurality of microphones and control a shooting direction of a camera in the speaker direction.
  • the position of a speaker is detected based on an audio signal picked up by a directional microphone arranged for each participant, and an image of the position direction of the speaker is captured by a camera. It is disclosed to shoot!
  • Patent Document 1 Japanese Patent Laid-Open No. 61-198891
  • Patent Document 1 it is necessary to arrange a directional microphone for each participant, and a directional microphone must be prepared according to the number of participants in the conference.
  • the microphone beam is used for collecting sound and detecting the speaker's position, if you try to pick up a wide range of sounds, it will be impossible to identify the speaker, and if you try to record a narrow range of sounds The speaker can be identified, but if there are two or more speakers at the same time, there is a problem that only one speaker can be picked up.
  • an audio conference apparatus includes:
  • a microphone array having a plurality of microphones arranged in a predetermined pattern
  • An area sound collection beam forming unit for forming a first sound collection beam in which a first sound collection range around the device is set;
  • a second sound collecting beam in which a second sound collecting range narrower than the first sound collecting range is set is formed.
  • a shooting direction detection unit that detects a speaker direction from a plurality of second sound collection beams formed by the spot sound collection beam forming unit, and detects the speaker direction as a shooting direction;
  • the audio conference apparatus collects sound using a microphone array including a plurality of microphones.
  • the audio conference apparatus forms an area sound collection beam corresponding to a wide area and a spot sound collection beam corresponding to a plurality of spots in a narrow range from the collected sound signal. Then, the audio conference apparatus generates and outputs audio data based on the area sound collection beam.
  • the audio conference apparatus controls the shooting direction of the camera based on the spot pickup beam. As a result, the audio conference apparatus can output audio data collected over a wide range.
  • the audio conference apparatus can set the direction of the main speaker as the shooting direction of the camera. Furthermore, since the audio conferencing apparatus of the present invention can automatically change the shooting direction of the camera when the main speaker changes, the main speaker can always be designated as the shooting direction.
  • the spot sound collecting beam forming unit forms a sound collecting beam using only a high frequency component of the sound collecting sound signal.
  • the audio conference apparatus is further connected to another audio conference apparatus via a network, and communicates with the other audio conference apparatus, and a first convergence formed by the area sound collection beam forming section.
  • a control unit that generates voice data based on the sound beam and transmits the voice data to the other voice conference apparatus via the communication unit.
  • the sound signal used for controlling the shooting direction of the camera uses only a high-frequency component, thereby enhancing directivity and forming a sound collection beam.
  • the voice conference apparatus can increase the directivity of only the sound collection beam used for controlling the shooting direction of the camera, and thus the position of the speaker can be detected more accurately.
  • the audio conference system includes: A microphone array having a plurality of microphones arranged in a predetermined pattern;
  • An area sound pickup that forms a first sound pickup beam in which a first sound pickup range around the device is set.
  • a second sound collecting beam in which a second sound collecting range narrower than the first sound collecting range is set is formed.
  • a shooting direction detection unit that detects a speaker direction from the plurality of second sound collection beams formed by the spot sound collection beam forming unit, and detects the speaker direction as a shooting direction;
  • a shooting unit that shoots the shooting direction detected by the shooting direction detection unit of the audio conference device and generates video data
  • the audio conference system includes an audio conference apparatus and a camera.
  • the audio conferencing device generates audio data collected over a wide range and controls the camera with the main speaker as the shooting direction.
  • the camera shoots the shooting direction specified by the audio conference device and generates shooting data.
  • the voice conference system can pick up the main speaker as the camera shooting direction while collecting voice over a wide range. Furthermore, since the audio conference system of the present invention can automatically change the shooting direction of the camera when the main speaker changes, the camera can always capture the main speaker.
  • FIG. 1 is an explanatory diagram of a voice conference system that performs a voice conference with a remote place.
  • FIG. 2 is a three-sided view of the audio conference apparatus 1 according to the present embodiment.
  • FIG. 3 is a three-sided view showing the audio conference apparatus 1 according to the present embodiment.
  • FIG. 4 is a block diagram showing a functional configuration of the audio conference system according to the present embodiment.
  • FIG. 5 is an explanatory diagram of a sound collection area.
  • FIG. 8 is a block diagram of an audio conference system according to another embodiment.
  • FIG. Fig. 1 is an explanatory diagram of an audio conference system for teleconferencing with remote locations.
  • the audio conference system of the present invention includes an audio conference device 1, a camera 7, a display terminal 8, and a video communication device 9.
  • a camera 7 is connected to the audio conference apparatus 1.
  • a video communication device 9 is connected to the camera 7.
  • a display terminal 8 is connected to the video communication device 9.
  • the camera 7 is used to photograph the participants of the conference, and includes an imaging unit 71 and a connection terminal unit 72.
  • the camera 7 receives an input signal from the audio conference device 1 via the connection terminal unit 72 (sound collection described later).
  • the imaging unit 71 is rotated up, down, left, and right (for example, about 120 degrees up and down, and about 200 degrees left and right), and shooting in the direction designated by the audio conference apparatus 1 is performed.
  • the camera 7 outputs the shooting data to the video communication device 9 via the connection terminal unit 72.
  • Connection terminal 7 2 includes a video output terminal, a multi-connector, a power supply terminal, and the like.
  • the display terminal 8 is used to display video data received from a remote video conference system via the network 100.
  • the display terminal 8 includes a display unit 81 and a connection terminal unit 82.
  • the input signal is received via the connection terminal section 82 and displayed on the display section 81.
  • the display terminal 8 is a projector, a liquid crystal display, or the like.
  • the video communication device 9 is a device that performs compression / decompression of video data and protocol control, and transmits / receives video data via the network 100. Specifically, the video communication device 9 compresses the shooting data input from the camera 7 and then packetizes and outputs the packetized data to the network 100. In addition, when video data is input from the network 100, the video communication device 9 arranges the packetized video data in time series and sequentially outputs them to form a bit stream, which is then expanded and displayed on the display terminal 8. Output to.
  • the audio conference apparatus 1 uses a microphone array including a plurality of microphones arranged linearly. Then, sound collection directivity is formed by delaying and synthesizing the sound collected by each microphone. This formed sound collection directivity is called a sound collection beam.
  • the types of sound collection beams include the direction of the sound collection beam, a narrow range with the tip set to a specific sound collection spot, and an area with a certain extent (for example, each side of the audio conference device 1).
  • Direction (speech area)) to collect a wide range of sounds generated with high gain and to suppress the sounds (noise) generated in other areas.
  • FIG. 2 is a three-sided view showing the audio conference apparatus.
  • 2A is a plan view
  • FIG. 2B is a front view
  • FIG. 2C is a right side view.
  • 3 is a diagram showing a speaker arrangement and a microphone arrangement of the audio conference apparatus shown in FIG. 2,
  • FIG. 3 (A) shows the front microphone arrangement
  • FIG. 3 (B) is a bottom speaker arrangement.
  • Fig. 3 (C) shows the rear microphone arrangement.
  • FIG. 2 (B) the surface shown in FIG. 2 (B) is called the front, and the upper, lower, left, and right sides of the device are defined based on this figure.
  • the audio conference apparatus 1 has an external appearance including a housing 2 and legs 3, and the housing 2 includes an operation unit 4, a light emitting unit 5, and an input / output connector panel 11.
  • Case 2 has a substantially rectangular parallelepiped shape that is long on the left and right sides, and the bottom surface of Case 2 is lifted a predetermined distance from the installation surface at the left and right ends of Case 2.
  • a leg 3 is provided.
  • An operation unit 4 having operation buttons such as a numeric keypad and a display screen is provided at the upper right end of the housing 2.
  • the operation unit 4 is connected to a control unit 10 installed in the housing 2.
  • the operation unit 4 receives an operation input from a participant and outputs the operation input to the control unit 10, and displays an operation content, an execution mode, and the like on the display screen under the control of the control unit 10.
  • a light emitting unit 5 made of light emitting elements such as LEDs and the like arranged radially around the substantially center of the housing 2 is installed at the center of the upper surface of the housing 2.
  • the light emitting unit 5 emits light according to the light emission control from the control unit 10.
  • the control unit 10 inputs a light emission control signal for lighting the LED in the sound collection direction to the light emitting unit 5.
  • an input / output connector panel 11 having a LAN interface, an analog audio input terminal, an analog audio output terminal, a digital audio input / output terminal, a serial terminal, and the like is installed. Connectors on connector panel 11
  • the input / output connector 110 is connected to the input / output interface 12 installed in the housing 2.
  • the input / output connector panel 11 is also provided with a DC jack to which power is supplied.
  • a lower surface grill 6 that is U-shaped in cross-section and covers the speaker array and the microphone array and is formed in a longitudinal shape is attached.
  • the bottom grill 6 is made of a metal plate with a punch mesh and protects the SP SP SP16, the microphones MIC10 to MIC116, and the MIC20 to MIC216, and allows sound that is emitted and collected to pass through. It ’s like that.
  • the microphone MIC10 ;! to MIC116 and the collected sound beam generation unit 181 form a sound collecting beam on the front side, and the microphone MIC20;! To MIC216 and the collected sound beam generating unit 182 are arranged on the rear side. Form.
  • the number of speakers in the speaker array is 16 and the number of microphones in each microphone array is 16.
  • the number of speakers and the number of microphones is not limited to this. What is necessary is just to set suitably.
  • the distance between the speaker array and the microphone array is arbitrary. In other words, the central part may be arranged densely at regular intervals and may be arranged sparsely as it goes to both ends.
  • the microphone array is configured as a line array, but the microphone array is not limited to a line array, and may be an array arranged in a matrix.
  • FIG. 4 is a block diagram showing a functional configuration of the audio conference system.
  • Fig. 5 is an explanatory diagram of the sound collection area.
  • Figure 5 (A) shows the sound collection area for sound collection
  • Figure 5 (B) shows the sound collection for position detection.
  • the audio conference system functionally includes a control unit 10, an input / output connector 110, an input / output interface 12 of the audio conference device 1, a sound output directivity control unit 13, a D / A converter 14, a sound output amplifier. 15, speaker array (speaker SP;! To SP16), microphone array (microphone MIC10;! To MIC116, MIC20;! To MIC216), sound collecting amplifier 16, A / D converter 17, sound collecting beam generator 181, 182, a collected sound beam selection unit 19, an echo cancellation unit 20, a camera control unit 22, a camera 7, a display terminal 8, an input / output interface 91 of the video communication device 9, a video codec 92, and an operation unit 4.
  • the control unit 10 receives an input from the operation unit 4, controls the sound output directivity control unit 13, receives an input from the speaker position detection unit 191, and controls the camera control unit 22. Details of the control will be described later.
  • the input / output interface 12 packetizes the input audio signal from the echo cancel unit 20 and outputs the packet to the network 100. Also, the audio signal input via the input / output connector 110 is converted into a digital audio signal S1 of a bit stream and output. The digital audio signal S 1 is supplied to the sound emission directivity control unit 13 via the echo cancellation unit 20.
  • audio signals are input via the network 100 and LAN connector.
  • the input / output interface 12 arranges the packetized audio signals in time series and sequentially outputs them, thereby converting them into bit streams and outputting them to the sound output directivity control unit 13.
  • the input / output interface 12 digitizes this signal and outputs it to the sound output directivity control unit 13.
  • the sound emission directivity control unit 13 generates an individual sound emission signal supplied to each speaker SP ;! to SP16 of the speaker array, with the audio signal power supplied from the input / output interface 12 according to an instruction from the control unit 10. It is a functional part to do.
  • the sound emission directivity control unit 13 generates an individual sound emission signal to be supplied to each speaker SP;! To SP16 so that a sound emission beam which is a sound made into a beam from the speaker array is emitted. For this reason, the sound emission directivity control unit 13 performs a predetermined delay process, a predetermined amplitude process, and the like on the input sound signal to generate individual sound emission signals.
  • the sound emission directivity control part 13 outputs the produced
  • Each D / A converter 14 converts the individual sound emission signal into an analog format and outputs it to each sound emission amplifier 15, and each sound emission amplifier 15 amplifies the individual sound emission signal and applies it to the speakers SP1 to SP16.
  • Each speaker SP;! To SP16 of the speaker array converts the supplied individual sound emission signal into sound and emits the sound to the outside. Speakers SP;! To SP16 are installed downward on the lower surface of the housing 2 so that the emitted sound is reflected on the installation surface of the desk on which the audio conference device 1 is installed, and the device with the participants Side force is propagated diagonally upward.
  • Each microphone MIC10 ;! to MIC116, MIC20;! To MIC216 of the microphone array picks up the sound on the front side and the back side of the audio conference device 1 and converts it into an audio signal that is an electrical signal. This audio signal is output to each sound collecting amplifier 16.
  • Each of the sound collecting amplifiers 16 amplifies the sound signal and supplies the amplified signal to the A / D converter 17, and the A / D converter 17 converts the analog sound signal into a digital signal to collect sound collecting beam generating units 181 and 182.
  • the microphone MIC10;! ⁇ MIC116 installed in the front is installed in the sound collection beam generator 181.
  • the collected sound signal from the front side is input, and the sound collecting beam generation unit 182 receives the sound signal from the back side collected by the microphones MIC20;! To MIC216 installed on the back surface.
  • the sound collecting beam generating units 181 and 182 are each of the microphones MIC10 to form a wide sound collecting beam for sound collecting and a narrow sound collecting beam for controlling the camera 7;! To MIC116, MIC20. ; ⁇ Delay processing is performed on the audio signal picked up by the MIC216.
  • one area is set on both the front and back sides, and a sound collecting beam that picks up each area.
  • MB 1 and MB 2 are formed and output to the collected sound beam selector 19.
  • Fig. 5 (B) In order to control the camera 7 to be directed to the main speaker, as shown in Fig. 5 (B), multiple spots (4 spots on the front side and back side in Fig. 5 (B)) are simultaneously applied. Collected sound beams MB1;! To MB14, MB2;! To MB24 are formed and output to the collected sound beam selector 19.
  • the collected sound beams MB1 1 to MB14, MB2;! To MB24 may be generated using only signals having a high directivity of about 1 kHz to 3 kHz.
  • spots are formed on the front side and the back side, respectively.
  • the present invention is not limited to this, and a plurality of spots may be used.
  • the sound collection beam selection unit 19 uses the speaker position detection unit 191 to select the most of the eight spot audio signals collected by the eight sound collection beams MB1;!-MB14, MB2;!-MB24. Assuming that the high-level audio signal is the target audio signal (that is, the speech of a conference participant that is not noise), the sound collection direction DS of the highest-level audio signal is detected, and the sound collection direction DS is sent to the control unit 10. Output.
  • the sound collection beam selection unit 19 selects a sound collection beam including the sound collection direction DS from the two sound collection beams MB1 and MB2, and outputs the selected sound collection beam as an audio signal MB0 to the subsequent echo cancellation unit 20.
  • the echo canceling unit 20 indicates that “the audio signal input from the input / output interface 12 is emitted from the sound power SP ;! to SP16, and the emitted audio signal is output from the microphone MIC10 ;! to Ml. It is a functional unit to prevent the echo phenomenon of “CI 16, MIC20;! ⁇ MIC216 and output from I / O interface 12 again”.
  • the echo cancel unit 20 estimates the regression sound of the above path using the adaptive filter 211, and suppresses the echo by subtracting the estimated regression sound from the voice signal collected by the microphone.
  • the echo cancellation unit 20 includes an adaptive echo canceller 21.
  • the adaptive echo canceller 21 includes an adaptive filter 211 and a post processor 212.
  • the adaptive filter 211 estimates a sound signal component that returns to the microphone MIC based on the sound signal supplied to the speaker SP, and generates a pseudo-regression sound signal.
  • the post processor 212 removes the echo component by subtracting the pseudo regression sound signal corresponding to the input sound signal S1 from the sound signal MB0 output by the sound collection beam selection unit 19.
  • the audio signal obtained by removing the echo component from the audio signal MB 0 is input to the input / output interface 12.
  • the audio signal returning from the speaker SP to the microphone MIC can be accurately predicted and removed, and only the audio signal collected by the microphone MIC can be input / output interface. 12 can be output.
  • the camera control unit 22 controls the direction of the imaging unit 71 of the camera 7 so that the sound collection direction DS is the center of the imaging direction.
  • the camera 7 determines the shooting direction according to the sound collection direction DS input from the audio conference apparatus 1. This makes it possible to automatically photograph the speaker.
  • the shooting data of the camera 7 is output to the video codec 92.
  • the video codec 92 compresses the shooting data input from the camera 7 and outputs the compressed data to the input / output interface 91. Also, the video codec 92 decompresses the video signal P1 input from the input / output interface 91 and outputs it to the display terminal 8.
  • the input / output interface 91 converts the shooting data input from the video codec 92 into a bucket and outputs it to the network 100.
  • the input / output interface 91 converts the video signal input from the network 100 into a digital video signal P1 of a bit stream and outputs it.
  • the digital video signal P1 is supplied to the display terminal 8 via the video codec 92. More specifically, when the video signal is input via the network 100, the input / output The tuface 91 arranges packetized video signals in time series and sequentially outputs them, thereby converting them into bit streams and outputting them to the display terminal 8.
  • the audio conference system As described above, in the audio conference system according to the present embodiment, two different sound collection beams are generated for sound collection and for speaker position detection. Then, using the sound collecting beam for sound collecting, the sound of the main speaker side is effectively collected without collecting the sound on the opposite side to the main speaker with respect to the audio conference apparatus. By doing so, the speech of the main speaker can be clarified. Furthermore, by identifying the position of the main speaker using the sound collection beam for detecting the position of the speaker, it is possible to take a picture with the camera 7 facing the main speaker. In addition, if the main speaker changes, the direction of the camera 7 can be switched automatically.
  • the audio conference system of the present invention can be used as a loudspeaker for a conference without using the video communication device 9.
  • a camera 7 is connected to the audio conference apparatus 1, and a display terminal 8 is connected to the camera 7.
  • the audio conference apparatus 1 amplifies the collected sound and emits it.
  • the camera 7 determines the shooting direction according to the sound collection direction DS input from the audio conference apparatus 1, performs shooting, and generates shooting data.
  • the camera 7 outputs the generated shooting data to the display terminal 8 and displays the shooting data on the display terminal 8.
  • the main speaker can be displayed on the display terminal 8 and the conference can proceed, the conference participants can easily know the main speaker.
  • the sound collection beam selection unit 19 synthesizes two sound collection beams MB1 and MB2 that are related to the sound collection direction of the sound signal to produce the sound signal.
  • An MBO may be generated, and this audio signal MBO may be output to the echo cancellation unit 20 at the subsequent stage.
  • the sound signal MBO is generated by synthesizing the two sound collecting beams MB1 and MB2, so that the main speaker can be captured with the camera 7 and the sound can be heard over a wide range only by the main speaker.
  • the speech of all participants can be collected effectively.
  • the audio conference apparatus 1 may be provided with an audio and video communication unit. Use this communication unit to hold a communication conference with the other party's voice conference device.
  • the power of S In this case, the shooting data shot by the camera 7 and the voice data collected by the microphone are output to the network 100 via the voice conference device 1. Then, a video signal input from another audio conference device at a remote location via the network 100 is displayed on the display terminal 8 via the audio conference device 1.
  • the camera 7 is controlled with the sound collection direction corresponding to the high-level audio signals detected by a plurality of narrow-range sound collection beams as the shooting direction. The shooting data shot by is sent.
  • the video signal input / output interface 91 may be integrated with the audio signal input / output interface 12 and connected to the network 100 via the common input / output connector 110.
  • the audio communication device 1 in FIG. 4 is further provided with a video communication unit, but not limited thereto, the audio conference device 1 in FIG. 7 may be further provided with a video communication unit.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Telephonic Communication Services (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

La présente invention concerne un système de téléconférence permettant de collecter une large plage de voix de participants à une conférence tout en imageant un haut-parleur principal. Le dispositif de conférence audio (1) collecte une large plage de voix et des voix divisées en plages plus étroites à l'aide d'un réseau de microphones formé en agençant une pluralité de microphones MIC. Des signaux vocaux (MB1, MB2) collectés dans une large plage sont utilisés en tant que signal vocal (MB0) pour la collecte de voix. De plus, la direction de collecte de voix (DS) est détectée à l'aide du signal vocal de plus haut niveau détecté à partir des signaux vocaux (MB11 à MB14, MB21 à MB24) qui ont été collectés en divisant une plage en plages plus étroites et la direction de traitement d'image d'une caméra (7) est contrôlée en fonction de la direction de collecte de voix (DS).
PCT/JP2007/070195 2006-10-17 2007-10-16 Dispositif de conférence audio et système de conférence audio WO2008047804A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2007800321284A CN101513056B (zh) 2006-10-17 2007-10-16 音频会议装置及音频会议系统

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JP2006-282565 2006-10-17
JP2006282565A JP5028944B2 (ja) 2006-10-17 2006-10-17 音声会議装置及び音声会議システム

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