WO2007032108A1 - Appareil de haut-parleur et appareil de conference vocale - Google Patents

Appareil de haut-parleur et appareil de conference vocale Download PDF

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Publication number
WO2007032108A1
WO2007032108A1 PCT/JP2006/305198 JP2006305198W WO2007032108A1 WO 2007032108 A1 WO2007032108 A1 WO 2007032108A1 JP 2006305198 W JP2006305198 W JP 2006305198W WO 2007032108 A1 WO2007032108 A1 WO 2007032108A1
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WO
WIPO (PCT)
Prior art keywords
voice
conference
speaker
sound
signal
Prior art date
Application number
PCT/JP2006/305198
Other languages
English (en)
Inventor
Toshiaki Ishibashi
Katsuichi Osakabe
Kosuke Saito
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
Priority claimed from JP2005268222A external-priority patent/JP4867248B2/ja
Priority claimed from JP2005306687A external-priority patent/JP4929673B2/ja
Application filed by Yamaha Corporation filed Critical Yamaha Corporation
Publication of WO2007032108A1 publication Critical patent/WO2007032108A1/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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • 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
    • 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
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • 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
    • 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

Definitions

  • the present invention relates to speaker apparatus using a speaker array having a plurality of aligned speaker units and a voice conference apparatus applied with the speaker apparatus for emitting a voice to a specific listener constituting an object.
  • a voice conference apparatus for holding a conference with a counter party present at a remote place by way of a telephone conference or the like.
  • the voice conference apparatus includes a speaker and a microphone. Further, the voice conference apparatus is additionally provided with a function of transmitting a talk voice of a conference attendant collected by a microphone to a voice conference apparatus of a counter party and a function of emitting a talk voice of the counter party received from the voice conference apparatus of the counter party from the speaker (refer to, for example, JP-A-5-158492) .
  • a talk can be made with the counter party present at a remote place and the conference attendant can hold a voice conference with the counter party present at the remote place.
  • a talk voice is emitted in a horizontal direction by using a nondirectional (having a wide directional range) speaker. Therefore, an arrival range is wide since a talk voice is transmitted horizontally and it is difficult to emit a voice to only a specific listener. That is, even when a voice is emitted to a specific listener, the voice is leaked to a surrounding over the specific listener. Therefore, when the voice conference apparatus is used at, for example, an office or the like, the talk voice is heard by other personnel other than the conference attendant who is the specific listener to hamper a work of the other personnel.
  • talk voices of a plurality of counter parties are emitted by using one piece of the nondirectional (having wide directional range) of the speaker . Therefore, the talk voices of the plurality of counter parties are emitted from the same sound source and therefore, it is difficult for a user to identify which person of the plurality of counter parties is speaking.
  • the invention adopts the following arrangement.
  • a speaker apparatus installed in a room comprising: a speaker array constituted by aligning a plurality of speaker units, a sound emitting side of the speaker units being installed to direct to a lower side; and a directionality control portion that focuses a voice beam such that the voice beam from the speaker array reflected by an object disposed on a lower side of the speaker array is directed at least in one predetermined direction at inside of the room.
  • the speaker apparatus further comprising an input portion for inputting respective voice signals from a plurality of counter parties, wherein the directionality control portion controls to delay the respective voice signals inputted to the input portion independently from each other such that voice beams of the respective voice signals are focused to different point sound sources.
  • a voice conference apparatus comprising: a speaker apparatus according to any one of (1) through ( 8) ; • and a microphone; wherein the speaker apparatus is provided with a function of transmitting and receiving a voice signal of a voice conference to and from a counter party voice conference apparatus disposed at a remote place.
  • the speaker array having the plurality of aligned speaker units is installed such that a sound emitting side of the speaker unit row is directed to the lower side.
  • the voice beam is outputted to direct to the lower side from the speaker unit row.
  • the voice beam reflected by the object disposed on the lower side of the speaker array (for example, when the apparatus is disposed on a desk, a desk or a floor face) is transmitted in an oblique upper direction of the object.
  • the voice beam is focused such that the voice beam from the speaker unit row reflected by the object is directed to the plurality or the single specific listener in the room by the directionality control portion.
  • the voice beam can be outputted by the directionality (directional direction and directional range) for covering only a position at which the specific listener is present and the vicinity thereof.
  • the voice beam reflected by the object and directed to the oblique upper side is controlled to direct to the specific listener. Thereby, leakage of sound to a person present on a rear side of the specific listener (assume that the listener is directed in.a direction of arrival of the voice beam) can be prevented.
  • the directionality of the voice beam can be controlled by the speaker array, voice is more or less leaked in a sound emitting direction.
  • the voice is outputted from the speaker array to the lower side and therefore, the voice is not heard by a person other than the specific listener by the leakage of sound.
  • the voice beam can preferably be reflected by the reflecting plate.
  • the speaker apparatus when the speaker apparatus is installed not at a conference room exclusive for a voice conference but a normal office room, also a personnel other than the conference attendant is present at inside of the room.
  • the voice beam of a talk sound can be outputted only to a conference attendant as an object thereof. Further, leakage of the sound to a surrounding of the conference attendants can be reduced. Thereby, the voice conference can be carried out without hampering a work of the other personnel at inside of the office room by the talk sound.
  • the voice beam can be outputted in a directional direction and a directional range for covering only a position at which the specific listener is present and the vicinity thereof. Further, the voice beam directed to the oblique upper side of the object can.be controlled to direct to the specific listener. Thereby, when the specific listener is directed to the speaker array, leakage of the sound to a person present on the rear side can be prevented.
  • the voice beam is outputted from the speaker array to the lower side and therefore, it can effectively be prevented that the voice is heard by a person other than the specific listener by a leakage of sound in a direction orthogonal to a sound emitting face.
  • the respective voice signals from the plurality of counter parties are inputted to the input portion.
  • the inputted voice signals are controlled such that the voice beams of the voice signals from the voice conference apparatus of the plurality of counter parties are focused to imaginary sound sources different from each other to be inputted to the speaker array.
  • the voices from the plurality of counter parties are positioned to positions respectively different from each other and a user can be made to easily identify from which counter party the voice is heard.
  • the voice beams are positioned to the imaginary point sound sources by using the speaker array and therefore, positions of the imaginary point sound sources and a number of the imaginary point sound sources can easily be changed. Thereby, time and labor taken by a user for changing positions of the sound sources is reduced, and the user can be made to identify easily from which counter party the voice is heard as described above without preparing speakers of a number of pieces in accordance with a number of persons of the counter parties .
  • the voice beam of the content can be outputted in two directions orthogonal to the line direction of the speaker unit. Therefore, when there are a plurality of users, the voice can be heard by being divided in the two directions. Thereby, the voice beam of the content can be outputted in two directions orthogonal to a line direction of the speaker unit. Therefore, when there are a plurality of users, the voice can be heard by being divided in the two directions. Further, it can effectively be prevented that the voice is heard by a person other than the specific listener.
  • Fig.l is a view generally showing a voice conference system.
  • Fig.2 is a perspective view viewing the voice conference apparatus shown in Fig.l by a section.
  • Fig.3 is a view for explaining a method of installing the voice conference apparatus shown in Fig.2 and a control of a directionality of a voice beam.
  • Fig .4 is a view viewing a room shown in Fig .3 from an upper side .
  • Fig.5 is a view for explaining a control of a directionality of a voice beam when conference attendants hi, h2 are seated not to be opposed to each other.
  • Fig.6 is a block diagram generally showing a constitution of a voice conference apparatus 1 shown in Fig.2 according to a first embodiment.
  • Fig.7 is a view for explaining a control of a directionality of a voice beam according to a second embodiment .
  • Fig.8 is a view for explaining a control of a directionality of a voice beam according to a voice conference apparatus of a third embodiment.
  • Fig.9 is a block diagram generally showing a constitution of the voice conference apparatus according to a third embodiment .
  • Figs.1 OA-IOC are views showing positions of imaginary point sound sources.
  • Fig.1OA shows a state in which when a conference is carried out among 4 points, voices from counter party apparatus of 3 points are positioned at imaginary point sound sources remote from each other by a uniform distance.
  • Fig.1OB shows a state in which when a conference among 3 points is carried out, voices from counter party apparatus at 2 points are positioned at imaginary point sound sources remote from each other by a uniform distance.
  • Figs. HA, HB are flowcharts showing processing executed by the voice conference apparatus shown in Fig.9
  • Fig. HA is a flowchart showing a corresponding processing
  • Fig. HB is a flowchart showing a distributing processing.
  • Fig.12 illustrates diagrams showing tables stored by a control portion.
  • Fig.l3A is a plane view showing a speaker array 2OA according to a modified example
  • Fig.l3B is a plane view showing a speaker array 2OB according to a modified example.
  • Fig.14 is a plane view showing a speaker array 2OC according to a modified example.
  • FIG.l is a view generally showing the voice conference system 100.
  • the voice conference system 100 is a system for carrying out a voice conference among a plurality of conference attendants h present at a plurality of conference points.
  • the voice conference system 100 is a system in which a plurality of voice conference apparatus 200 arranged at respective conference points are connected by a network N.
  • the network is a wide area network of, for example, internet, LAN or the like.
  • the respective voice conference apparatus 200 are- provided with a function of communicating with other (counter party) voice conference apparatus 200 (counter party apparatus 200' ) connected to the network N for transmitting and receiving voice signals for the conference to each other by the communication.
  • a communication protocol used for the communication is not particularly limited, for example, TCP (Transmission Control Protocol) /IP (Internet Protocol) or the like is used.
  • Fig.2 is a perspective view viewing the voice conference apparatus 200 shown in Fig.1 by a section.
  • the voice conference apparatus 200 is constituted by a shape of substantially a long parallelepiped and includes a speaker apparatus 2 constituted by a shape of substantially a long parallelepiped at an upper portion of a frame member 1 constituted by a shape of a square a side face in Y-Y direction of the drawing of which is opened.
  • the speaker apparatus 2 is connected with a microphone 3 by way of a connecting line 3a.
  • a lower face of the speaker apparatus 2 is arranged with a speaker array 20 such that a sound emitting side thereof is directed to a lower side.
  • a voice for the conference is emitted by inputting the voice for the conference transmitted from the counter party apparatus 200' to the speaker array 20. Further, a voice of the conference attendant h who is a user is collected by the microphone 3, the collected voice is transmitted to the counter party apparatus 200' and is emitted from the speaker array 20 of the counter party apparatus 200' . Thereby, the voice conference can be carried out among the plurality of voice conference apparatus 200.
  • the speaker array 20 comprises 8 pieces of speaker units SP (SPl through SP8) aligned to direct downward in a shape of a line over an elongated direction.
  • SPl through SP8 When a voice signal is inputted to the speaker units SPl through SP8, a voice beam is outputted from the speaker array 20 to direct downward.
  • the voice beam outputted to a lower side is directed to an oblique upper side by being reflected by a lower face 10 (hereinafter, referred to as reflecting plate 10) of the frame member 1 and is emitted from a side portion of the frame 1 in Y-Y direction of the drawing.
  • the reflecting plate 10 is formed in a flat plate made of, for example, a resin, thereby, the voice beam can be reflected preferably.
  • a material of the reflecting plate 10 is not limited to a resin but may be a metal material or the like so far as the voice beam can preferably be reflected.
  • the shape of the reflecting plate 10 is not limited to the flat plate shape but may be a smoothly curved shape or the like.
  • the voice beam can be focused to an imaginary point sound source P and a position of the imaginary point sound source P can be changed to an arbitrary position. That is, by providing delay time periods to the voice signals inputted to the speaker units SPl through SP8 as shown by arrow marks in the drawing, a sound image of the voice beam can be positioned at the imaginary point sound source P. Thereby, the conference attendant h can be made to recognize to hear the conference voice from the imaginary point sound source P.
  • Voices are outputted from the respective speaker units SP to transmit in a radial shape (circular shape) .
  • a radial shape circular shape
  • the respective voices are outputted simultaneously, only phases of components transmitted in parallel with each other coincide with each other to intensify each other. Further, components thereof transmitted in other direction interfere with each other and canceled thereby among the voices from the contiguous speaker units SP . Thereby, a synthesized voice from the speaker units SPl through SP8 becomes the voice beam.
  • the voice beam is directed right to the lower side and the beam width at the directional point becomes a width substantially the same as a distance between the speaker unit SPl and the speaker unit SP8. Therefore, the voice beam reflected by the reflecting plate 1OA is provided with a width substantially the same as the distance between the speaker unit SPl and the speaker unit SP8 and is directed to a front direction of the voice conference apparatus 1.
  • the directional direction can be controlled to direct the voice beam to the directional point and the beam width can be controlled to the predetermined beam width.
  • Fig.3 is a view for explaining a method of installing the voice conference apparatus 200 shown in Fig.2 and a control of a directionality of the voice beam.
  • a room R is not a conference room or the like exclusive for the voice conference but is an ordinary office room.
  • Fig.3 is a view viewing the room R from a horizontal direction.
  • the voice conference apparatus 200 is arranged on the conference desk such that Y-Y direction (refer to Fig.2) comes to a direction of making the conference attendants hi, h2 opposed to each other.
  • the voice beam outputted from the hole portion of the frame member 1 is reflected by the reflecting plate 10 and is outputted in an oblique upper direction to the head portions of the conference attendants hi, h.2. Therefore, in comparison with a case of outputting a voice beam in the horizontal direction to the conference attendants hi, h2, it can effectively be prevented that the voice is heard by persons disposed on rear sides of the conference attendants hi, h2.
  • a directionality of the voice beam in X-X direction of Fig.2 can be controlled and therefore, leakage of sound in X-X direction can effectively be prevented.
  • the directionality of the voice beam can be controlled by the speaker apparatus 2, the voice is more or less leaked in a direction orthogonal to a sound emitting face.
  • the voice beam is outputted from the speaker array 20 to the lower side and therefore, it can be prevented that the voice is heard by a person other than the specific listener by the leakage of the sound.
  • a speaker apparatus installed such that the sound emitting side of the speaker unit SP is directed to an upper side the above-described effect is achieved by controlling the directionality such that the voice beam reflected by a ceiling is directed to the conference attendants hi, h2.
  • Fig.4 is a view viewing the room R shown in Fig.3 from an upper side. As described above, the directional direction and the beam width of the voice beam reflected by the reflecting plate 10 can be controlled in X-X direction.
  • the directionality is controlled such that the reflected voice beam is directed to the conference attendants hi, h.2, that is, the directional point becomes the head portions of the conference attendants hi, h.2.
  • the voice beam can be directed to the conference attendants hi, h2 by providing audio signals with the delay time periods (time periods indicated by arrow marks of the drawing) such that the voices from the respective speaker units arrive at the conference attendants hi, h2 at the same timing.
  • the conference attendants hi, h.2 are seated at positions opposed to each other by interposing the conference desk. Therefore, when the directionality of the voice beam is controlled to be directed to either one of the conference attendants, the voice beam can be outputted to both of the conference attendants hi, h.2 in a narrow directional range of covering only the conference attendants hi, h2.
  • the voice beam cannot be directed to both thereof by only controlling the directionality of the voice beam to be directed to either one of the conference attendants hi, h2.
  • the speaker apparatus 2 outputs the voice beam with a broadness such that the voice beam is reflected by the reflecting plate 10 and arrives at the conference attendants hi, h2 by a width dimension L to cover both areas of the conference attendants.
  • the voice beam is outputted with a broadness from the point P and the voice beam is reflected by the reflecting plate 10 and arrives at the positions of the conference attendants hi, h2 by the width dimension of L.
  • the directionality and the beam width are controlled to output a voice beam the same as the voice beam and'therefore, the delay time periods Dl through D8 are set to values indicated by bold line arrow marks of the drawing. Further, in this way, by outputting the voice beam with the broadness, even in a case of a number of the conference attendants, the voice beam can be outputted in a directional range of- covering a number of attendants and vicinities thereof.
  • Fig.6 is a block diagram generally showing a constitution of the voice conference apparatus 200 shown in Fig.2.
  • the voice conference apparatus 200 is provided with a function of transmitting and receiving a voice signal of, for example, a talk sound or the like to and from the voice conference apparatus 200 of the counter party (hereinafter, designated as "voice conference apparatus 200'" by differentiating from the own apparatus) .
  • the voice conference apparatus 200 makes the conference attendants hi, h2 who are the users of the own apparatus and the counter party who is a user of the voice conference apparatus 200' carry out the voice conference.
  • the speaker apparatus 2 is provided an input/output interface 21, an echo canceler 22, a D/A (digital/analog) converter 23, a delay portion 24, an amplifier 25 and a control portion 26 other than the speaker array 20.
  • the input/output interface 21 transmits and receives a digital voice signal to and from the voice conference apparatus 200' connected to a communication cable by way of the communication cable connected to a connecting terminal 27.
  • the echo canceler 22 is inputted with a voice signal (receiving voice signal) received from the voice conference apparatus 200' by way of the input/output interface 21.
  • the echo canceler 22 generates a quasi signal simulating an echo component outputted from the speaker array 20 and fed back to the microphone 3 by using the input signal. Further, the echo canceler 22 remove the echo component by removing the quasi signal from the voice signal (mentioned later) inputted from the microphone 3.
  • the delay portions 24 are provided by a number of pieces of the speaker units SPl through SP8 (8 pieces) in correspondence with the directionality control portion of the invention.
  • the delay portions 24 are attached with numerals -similar to those in correspondence with the speaker units SPl through SP8 as suffixes.
  • the delay portion 24 in correspondence with the speaker unit SPl is described as the delay portion 24-1.
  • the delay portions 24-1 through 24-8 respectively input the receiving voice signals from the echo canceler 22.
  • the delay portions 24-1 through 24-8 are respectively set with the delay time periods Dl through D8.
  • the delay portions 24-1 through 24-8 correspond to the directionality control portion of the invention and focus the voice beam by delaying the inputted receiving voice signals by the delay time periods Dl through D8 to input to the corresponding amplifiers 25 by way of the D/A converters 23. That is, by the delay time periods Dl through D8 attached to the inputted receiving voice signals, the delay portions 24-1 through 24-8 control the directionality in X-X direction (refer to Fig.2) of the voice beam, that is, the directional direction and the directional range (beam width at the directional point) as described above.
  • the D/A converters 23 are provided by a number of pieces of the delay portions.
  • the D/A converters 23 (23-1 through 23-8) are inputted with the receiving voice signals attached with the delay time periods respectively from the corresponding delay portions 24.
  • the D/A converters 23-1 through 23-8 convert the inputted receiving voice signals from digital signals to analog signals to input to the corresponding amplifiers 25.
  • the amplifiers 25 amplify signal levels of the inputted voice signals.
  • the amplifiers 25 are provided by a number of pieces in correspondence with the speaker units SPl through SP8.
  • numerals similar to those in correspondence with the speaker units SPl through SP8 are attached as suffixes.
  • the amplifier 25-1 through the amplifier 25-8 are inputted with the receiving voice signals from the delay portions 24-1 through 24-8 by way of the D/A converters 23 (23-1 through 23-8) .
  • the amplifier 25-1 through the amplifier 25-8 amplify the signal levels of the inputted receiving voice signals to input to the corresponding speaker units SPl through SP8 and a talk voice of the counter party from the voice conference apparatus 200' is emitted.
  • the control portion 26 is provided with, for example, CPU (Central Processing Unit) , a storing portion of a memory or the like, a user interface of an operating portion or the like. By executing a program stored to the memory, the control portion 26 controls operation of respective portions of the speaker apparatus 2 such as, for example, a talk with the voice conference apparatus 200' . ' The control portion 26 calculates the delay time periods Dl through D8 to set to the delay portions 24-1 through 24-8.
  • CPU Central Processing Unit
  • the delay time periods Dl through D8 are calculated, for example, as follows.
  • a width dimension (dimension in Y-Y direction of Fig.3) of the conference desk is inputted from users of the conference attendants hi, h2 or the like by using an operating portion 31.
  • seating information of at which position on X-X side of the speaker apparatus 2 (any position of front, right position, left position) the conference attendant is seated is inputted from the user by using the operating portion.
  • the front side is Y side and therefore, seating information of being seated at left position is inputted.
  • the control portion 26 can calculate a general position of the head portion of the conference attendant.
  • the delay time periods Dl through D8 are calculated to set a directional direction of the voice beam by the calculated position of the head portion and to be able to constitute the beam width for covering the head portion at the directional point.
  • the user may input a distance from a bottom face of the speaker apparatus 2 to the head portion of the conference attendant hi in place of the width dimension of the conference desk.
  • the delay time periods Dl through D8 are calculated by the distance and the seating information.
  • the speaker apparatus 2 is provided with a microphone amplifier 28 and an A/D converter 29 in addition to the above-described constitution.
  • the microphone amplifier 28 inputs a voice signal (transmitting voice signal) from the microphone 3 connected to a connecting terminal 30.
  • the microphone amplifier 28 amplifies the inputted transmitting voice signal to input to the A/D converter 29.
  • the A/D converter 29 converts the analog transmitting voice signal into digital to input to the echo canceler 22.
  • the echo canceler 22 removes the echo component by removing the quasi signal from the inputted transmitting voice signal as described above. Further, the transmitting voice signal is transmitted to the voice conference apparatus 200' by way of the echo canceler 22 - the input/output interface 21 - a communication cable (not illustrated) .
  • the speaker array 20 is arranged such that the sound emitting sides of the speaker units SPl through SP8 are disposed on the lower side.
  • the reflecting plate 10 is arranged on the lower side of the speaker array.
  • the voice outputted from the speaker array 20 to the lower side and reflected by the reflecting plate 10 is directed to the oblique upper direction.
  • the reflected voice beam is outputted from the hole portion of the frame member 1.
  • the delay time periods Dl through D8 are set such that the voice beam outputted from the hole portion is provided with the beam width of covering the conference attendants hi, h2 and is directed to areas of the conference desk and the conference attendants hi, h2.
  • the voice beam is transmitted only to the conference attendants hi, h2, or the conference attendants hi, h2 and vicinities thereof. Therefore, a talk voice can be outputted by constituting the object by only the conference attendants hi, h2.
  • the voice beam in the horizontal direction is outputted to the conference attendants hi, h.2, the sound is liable to be leaked to a person present in a direction of outputting the voice beam.
  • the voice beam is outputted to the conference attendants hi, h2 to direct from the lower side to the oblique upper side. Therefore, the leakage of sound to surroundings of the conference attendants hi, h2 can effectively be prevented.
  • a directionality of the voice beam can be controlled by the speaker array 20, a voice is more or less leaked in the direction of emitting the sound, according to the embodiment, the voice is outputted from the speaker array 20 to the lower side and therefore, it can be prevented that by the leakage of sound, the sound is heard by a person other than the specific listener.
  • the delay time periods Dl through D8 are set such that the beam width at the directional point becomes the width dimension L covering the conference attendants hi, h.2.
  • a plurality of voice beams each having a narrow beam width covering only an individual one of the conference attendants may be outputted to each one of the conference attendants hi, h2.
  • the speaker units SPl through SP8 are divided into a plurality of groups and a plurality of voice beams directed to other place may be outputted from the respective groups. Further, all the speaker units SPl through SP8 may commonly be used for the respective voice beams.
  • a third embodiment of the invention will be explained in reference to Fig.8.
  • the system for holding the voice conference between the two conference points that is, the case of one piece of the voice conference apparatus of the counter party is explained
  • a system of holding a voice conference among three or more of conference points will be explained.
  • Fig.8 is a view for explaining a control of a directionality of a voice beam according to the voice conference apparatus 200.
  • Fig.8 is a view viewing the room R shown in Fig.3 from Y direction.
  • the conference attendant h2 and a conference chair on which the conference attendant h2 is seated are omitted in order to facilitate to understand the drawing.
  • the voice beam is controlled such that voices from the counter party terminal 200' are focused to the imaginary point sound sources P different from each other in a line direction (X-X direction) of the speaker unit SP.
  • the voice beams are controlled such that sound images are positioned at the imaginary point sound sources P (Pl through P3) different from each other at 3 locations. Therefore, the conference attendant hi recognizes that the sound sources are present at positions of the imaginary point sound sources P in X-X direction and at positions on Y side of the imaginary point sound sources P by amounts of distances from the imaginary point sound sources P to the reflecting plate 10 in Y-Y direction. Further, the conference attendant h.2 recognizes such that sound sources are present at positions of the imaginary point sound sources P in X-X direction and at positions on -Y side of the imaginary point sound sources P by amounts of distances from the imaginary sound sources P to the reflecting plate 10.
  • the conference attendants hi, h.2 can be made to recognize to hear 1 voices from the plurality of counter party apparatus 200' from sound sources different from each other and can be made to identify comparatively easily from which counter party the voice is heard.
  • the voice conference apparatus 200 by focusing the voice beams from the speaker array 20 to a plurality of locations of the imaginary point sound sources P, the conference attendants h are made to recognize to hear voices from a plurality of locations of sound sources. Therefore, by changing the delay time periods provided to the voice signals inputted to the speaker unit SP, the positions of the imaginary point sound sources P can easily be changed. In accordance therewith, a number of the- imaginary point sound sources P can be changed by only preparing a number of channels of a functioning portion for providing the delay time periods by a desired number of pieces of the imaginary point sound sources P.
  • the voice beams are reflected by the reflecting plate 10 to be outputted by being divided in two directions in Y-Y direction and therefore, the separated voice components in two directions become the same content. Therefore, when the voice components in two directions are heard, the conference attendants h recognize such that sound images are positioned respectively at true and inverse positions. Specifically, when the counter party apparatus 200' disposed at Hokkaido are positioned at the imaginary point sound source Pl, the conference attendant hi hears the sound as if the sound source of the voice were present at a right end of the attendant per se and the conference attendant h2 is made to hear the sound as if the sound source of the voice were present at a left end of the attendant per se. Thereby, both of the conference attendants hi, h2 can be made to recognize such that voices from the plurality of counter party apparatus 200' are heard from respectively different sound sources.
  • Fig.9 is a block diagram generally showing a constitution of the voice conference apparatus 200 according to the third embodiment.
  • the speaker apparatus 2 is provided with the input/output interface 21, the echo- canceler 22, a signal distribution portion 32, the delay portion 24, an adding portion 33, the D/A (digital/analog) converter 23, the amplifier 25, the operating portion 31 and the control portion 26 other than the speaker array 20.
  • the input/output interface 21 corresponds to the input portion of the invention, connected to the network N by way of a communication cable (not illustrated) or the like connected to the connecting terminal 27 to transmit and receive the digital voice signal to and from the voice conference apparatus 200' connected to the network N.
  • the echo canceler 22 is inputted with the conference voice signal (receiving voice signal) received from the voice conference apparatus 200' by way of the input/output interface 21.
  • the receiving voice signal is inputted by a unit of packet. Further, communication among the voice conference apparatus 200 is not limited to packet communication and the receiving voice signal may not be inputted by the unit of packet .
  • the echo canceler 22 generates the quasi signal simulating the echo component outputted from the speaker array 20 and fed back to the microphone 3 by using the input signal.
  • the echo canceler 22 inputs the receiving voice signal to the signal distributing portion 32 by way of the input/output interface 21. Further, the echo canceler 22 removes the echo component by removing the quasi signal from a voice signal (mentioned later) inputted from the microphone 3.
  • the signal distributing portion 32 is realized by, for example, DSP (Digital Signal Processor) or the like, refers to a transmission source ID included in the inputted receiving voice signal and executes a processing of inputting the receiving voice signal to a channel of the delay portion 24 in correspondence with the transmission source ID (distributing processing) .
  • the distributing processing will be described later in details in reference to Fig.11 (b).
  • the transmission source ID is, for example, an IP address or the like and is transmitted by being included in communication data in communication among the plurality of voice conference apparatus 200.
  • the signal distributing portion 32 is set with the transmission source ID and the channel of the delay portion 24 in correspondence with the transmission source ID to correspond to each other.
  • the signal distributing portion 32 distributes to input a received voice signal to respective channels of the delay portion 24 based on the setting.
  • the delay portion 24 corresponds to a sound emitting portion of the invention, and is provided correspondingly to a number of pieces of the speaker units SPl through SP8 ( ⁇ pieces).
  • the respective delay portions 24 are attached with numerals similar to those in correspondence with the speaker units SPl through SP8 as suffixes .
  • the delay portion 24 in correspondence with the speaker unit SPl is described as the delay portion 24-1.
  • Sound images can be positioned at imaginary point sound sources P by setting the respective delay portions 24-1 through 24-8 with delay time periods the same as the delay time periods by which voices from the imaginary point sound sources P arrive at the respective speaker units SP (delay time period as shown by, for example, Fig.2) .
  • the delay portions 24-1 through 24-8 of the respective channels correspond to positions of the imagery point sound sources P different from each other in X-X direction. That is, the respective channels are set with delay time periods by which voice beams are focused at the imaginary point sound sources P different from each other and the set delay time periods are provided to the inputted signals. Further, the respective channels are made to correspond to transmission sources different from each other and receiving voice signals of the transmission sources in correspondence therewith as described above are inputted from the signal distributing portion 32. Thereby, receiving voice signals from different transmission sources are provided with the delay time periods such that sound images are positioned at different imaginary point sound sources P. Therefore, voices received from different counter party apparatus 200' can be made to focus to different imaginary point sound sources P.
  • the delay portions 24-1 through 24-8 of the respective channels input voice signals provided with the delay time periods to the respectively corresponding adding portions 33.
  • the adding portions 33 correspond to the sound emitting portion of the invention and provided by a number of pieces of the delay portions 24-1 through 24-8. Further, when the adding portions 33 are identified, the adding portions 33 are attached with suffixes the same as those of the corresponding delay portions 24-1 through 24-n.
  • the adding portions 33-1 through 33-8 input receiving voice signals provided with delay time periods from the respectively corresponding delay portions 24.
  • the respective adding portions 33 synthesize voice signals inputted from the respective channels to input to the corresponding D/A converters 23.
  • the D/A converters 23 correspond to the sound emitting portion of the invention and provided by a number of pieces of the adding portions 33-1 through 33-8.
  • the D/A converters 23 are attached with suffixes the same as those of the corresponding adding portions 33-1 through 33-8.
  • the respective D/A converters 23-1 23-8 input receiving voice signals provided with delay time periods from the respectively corresponding adding portions 33.
  • the D/A converter 23-1 through 23-8 convert digital receiving voice signals into analog to input to the corresponding amplifiers 25.
  • the amplifiers 25 correspond to the sound emitting portion of the invention and amplify signal levels of inputted voice signals.
  • the amplifiers 25 are provided by a number of pieces in corresponding with the speaker units SPl through SP8.
  • the amplifiers 25 are attached with numerals similar to those in correspondence with the speaker units SPl through SP8 as suffixes.
  • the amplifiers 25-1 through the amplifiers 25-8 input receiving voice signals from the adding portions 33-1 through 33-8 by way of the D/A converters 23 (23-1 through 23-8) .
  • the amplifier 25-1 through the amplifier 25-8 amplify signal levels of inputted receiving voice signals to input to the corresponding speaker units SPl through SP-8. Thereby, voices of receiving voice signals are emitted from the speaker units SPl through SP8 and talk voices of counter parties from the voice conference apparatus 200' are emitted.
  • the operating portion 31 receives operation of a user of the conference attendant h, an operator or the like to input an operating signal indicating a content of the operation to the control portion 26.
  • operations of the user there are an operation of starting the voice conference, or an operation of setting the voice conference beforehand.
  • the operation of selecting the conference point is an operation of selecting at which of the voice conference apparatus 200 respectively arranged at a plurality of points constituting the voice conference system 100 the voice conference is held.
  • the voice conference apparatus 200 are arranged respectively at "Hokkaido", “Tokyo”, “Nagoya”, “Osaka” and among them, the voice conference apparatus 200 is arranged at Osaka.
  • the voice conference is intended to be held at "Tokyo” and “Nagoya” in “Hokkaido”, “Tokyo”, “Nagoya”, a user inputs numerals or the like indicating "Tokyo” and "Nagoya” by using ten keys or the like, not illustrated, of the operating portion 31. Thereby, it is inputted that conference points are "Tokyo" and "Nagoya".
  • a voice from the counter party apparatus 200' of the selected conference point is positioned to a plurality of different locations of the point sound source positions as described above, in the operation of setting the conference beforehand, there is an operation of selecting a position pattern of the imaginary point sound source P.
  • the position pattern of the imaginary point sound source P will be explained.
  • Figs.l0A-10C are views showing positions of imaginary point sound sources P viewed from above.
  • Fig.1OA shows a state in which when a conference is held among 4 points, voices from the counter party apparatus 200' of 3 points are positioned at the imaginary point sound sources P remote from each other by a uniform distance.
  • Fig.1OB shows a state in which when a conference is held among 3 points, voices from the counter party apparatus 200' of 2 points are positioned at the imaginary point sound sources P remote from each other by a uniform distance.
  • the position pattern of the imaginary point sound sources P of whether the imaginary point sound sources P of voices from the counter party apparatus 200' are uniformly arranged as shown by Figs .1OA, 1OB, or the imaginary point sound source P of voices from the respective counter party apparatus 200' are arranged by setting the chairman as shown by Fig.1OC is set based on selection of the user. Further, when the chairman is set, the user operates to select a conference area constituting the chairman.
  • the control portion 26 executes a processing of corresponding selected conference points and positions of the imaginary point sound sources P (corresponding processing) (described later in details) .
  • the control portion 26 is provided with, for example, CPU (Center Processing Unit) and a storing portion of a memory or the like. By executing a program stored to the memory, the control portion 26 controls operations of respective portions of the speaker apparatus 2 of, for example, a talk among the voice conference apparatus 200' or the like.
  • CPU Center Processing Unit
  • control portion 26 executes a processing of making the respective channels of the delay portions 24 and the signal distributing portion 32 set the voice conference beforehand. Specifically, the control portion 26 inputs an operating signal showing selection of the conference area and an operating signal showing selection of the position pattern of the imaginary point sound sources P from the operating portion 31. The control portion 26 executes the corresponding processing, mentioned later, in reference to Fig. HA by using the input signals. By executing the corresponding processing, the control portion 26 corresponds the transmission source ID of the selected conference point and the position of the imaginary point sound source P.
  • control portion 26 corresponds the transmission source ID of the selected conference point and the channel of the delay portion 24 and sets the corresponding to the signal distributing portion 32.
  • the transmission source ID of the inputted receiving voice signal is referred and the voice signal is inputted to the channel in correspondence with the transmission ID.
  • the control portion 26 calculates the delay time periods for focusing the voice beams to the positions of the imaginary point sound sources P at respective conference points and set the corresponding channel of the delay portion 24.
  • the receiving voice signal inputted to the corresponding channel of the delay portion 24 is provided with the delay time periods in correspondence with the conference point and sound images are positioned to positions of the corresponding imaginary point sound sources P at the respective conference points.
  • the voice conference apparatus 200 is provided with the microphone amplifier 28 and the A/D converter 29 in addition to the above-described constitution.
  • the microphone amplifier 28 input to the conference voice signal (transmitting voice signal) from the microphone 3 connected to the connecting terminal 30.
  • the microphone amplifier 28 amplifies the inputted transmitting voice signal to input to the A/D converter 29.
  • the A/D converter 29 converts the analog transmitting voice signal into digital to input to the echo canceler 22.
  • the echo canceler 22 removes the echo component by removing the quasi signal from the inputted transmitting voice signal as described above. Further, the transmitting voice signal is transmitted to the voice conference apparatus 200' by way of the echo canceler 22 - the input/output interface 21 - the network N. Further, when the transmitting voice signal is transmitted from the input/output interface 21, the transmitting voice signal is transmitted by including the transmission source ID of the voice conference apparatus 200.
  • Figs. HA, HB are flowcharts showing processings executed by the voice conference apparatus 200 shown in Fig.9
  • Fig. HA is a flowchart showing the corresponding processing
  • Fig. HB is a flowchart showing the distributing processing.
  • the control portion 26 is inputted with the operating signal showing selection of the conference point (Sl), thereafter, inputted with the operating signal showing the position pattern of the imaginary point sound source P (S2) .
  • the control portion 26 acquires the imaginary point sound source P and corresponds the transmission source ID of the selected conference point and the acquired imaginary point sound source (S3) .
  • the corresponding will specifically be explained as follows.
  • the control portion 26 is stored with a table Tl (refer to Fig.12B) for registering a number of conference points and positions of the imaginary point sound sources P made to correspond to the position pattern of the imaginary point sound sources P. Further, the control portion 26 refers to the table Tl by the number of conference points and the position pattern of the imaginary point sound sources P to acquire positions of the imaginary point sound sources P in correspondence with the number of conference points and the position pattern of the imaginary point sound sources P.
  • control portion 26 is stored with a table T2 (refer to Fig.12B) registering the conference points and the transmission sources ID of the counter party apparatus 200' .
  • the control portion 26 refers to the table T2 by the selected conference point and acquires the transmission source ID in correspondence with the conference point.
  • the control portion 26 is stored with the corresponding by randomly corresponding the acquired transmission source ID to the acquired position of the imaginary point sound sources P.
  • control portion 26 corresponds the respective transmission sources ID and the channels of the delay portion 24 and sets the corresponding of the channel of the delay portion 24 of the transmission source ID to the signal distributing portion 32 (S4) . Further, the control portion 26 calculates the delay time periods of focusing the voice beam by the acquired imaginary point sound sources P at the respective imaginary point sound sources P (S5) to set to the channel of the corresponding delay portion 24 (S6) . Thereafter, the control portion 26 finishes the processing.
  • step S2 and step S3 are executed, in place thereof, there may be constructed a constitution in which the control portion 26 is stored with a table registering the conference points and the positions of the imaginary point sound sources P in correspondence with the conference points in place of the table Tl, acquires positions of the imaginary point sound sources P in correspondence with the conference points by using the table and acquires the positions of the imaginary point sound sources P in correspondence with the transmission sources ID of the conference points thereby.
  • the signal distributing portion 32 is at standby by repeatedly determining whether the receiving voice signal is inputted at predetermined time intervals until the determination (SH) .
  • the signal distributing portion 32 refers to the transmission source ID included in the receiving voice signal.
  • the signal distributing portion 32 determines the channel of the delay portion 24 in correspondence with the referred transmission source ID based on the corresponding of the set transmission source ID and the channel of the delay portion 24 (S12) .
  • the signal distributing portion 32 inputs the receiving ' voice signal to the determined channel (S13) . Thereafter, the signal distributing portion 32 returns the processing to step SH.
  • the delay time periods for focusing the voice beam at positions of the different imaginary point sound sources P are provided to the receiving voice signal transmitted from the counter party apparatus 200' arranged at the different conference point.
  • the speaker array 20 can output the voice beam for positioning the sounds from the different counter party apparatus 200' at the sound images at the positions of the different imaginary point sound sources P. Therefore, the conference attendants h can be made to easily identify from which conference point the voice is heard.
  • the speaker array 20 is arranged such that the sound emitting sides of the speaker units SPl through SP8 are disposed on the lower sides.
  • the reflecting plate 10 is arranged on the lower side of the speaker array 20.
  • the voice beam outputted from the speaker array 20 to the lower side and reflected by the reflecting plate 10 is divided in two directions in X-X direction to direct to the oblique upper side and is emitted from the side portion of the frame member 1.
  • the voice beam for positioning the voice 'from the different counter party apparatus 200' at the sound image at the position of the different imaginary point sound source P can be outputted in two directions . Therefore, the voice from the different counter party apparatus 200' can be positioned as sound image at the position of the different imaginary point sound source P for both of the conference attendants hi, h.2 seated at the conference desk opposedly as shown by Fig.3. Further, when the voice beam in the horizontal direction is outputted to the conference attendants hi, h2, the sound is liable to be leaked to a person present in the direction of outputting the voice beam. According to the embodiment, the sound beam is outputted to the conference attendants hi, h2 to be directed from the lower side to the oblique upper side. Therefore, the leakage of the sound to a surrounding of the conference attendants hi, h.2 can effectively be prevented.
  • the directionality of the voice beam can be controlled by the speaker array 20, the voice is more or less leaked in the direction orthogonal to the sound emitting face.
  • the voice beam is outputted from the speaker array 20 to the lower side and the directionality is controlled in the direction of the listener by the reflecting plate 10 and therefore, it can be prevented that the voice is heard by a person other than the specific listener by the leakage of voice.
  • the embodiment can adopt the following modified examples.
  • the voice conference apparatus 200 is provided with the reflecting plate 10, the embodiment is not limited thereto.
  • the frame member 1 is not provided with the reflecting plate 10 (lower face) and the voice beam is reflected by the conference desk installed with the voice conference apparatus 200 or a floor face.
  • a number of pieces of the speaker units is 8 pieces, the embodiment is not limited to a number of pieces but at least a number of pieces thereof capable of controlling the directionality and the beam width of the voice beam may be arranged.
  • the speaker array 20 aligned with the speaker units SP in the line shape is used. ' Therefore, a directional direction or a width dimension in a direction intersecting with the aligning direction (Y-Y direction of Fig.2 and Fig.3) cannot be controlled.
  • the invention is not limited to the constitution of the speaker array 20.
  • a constitution of controlling the directional direction and the width dimension in Y-Y direction by using a speaker array 2OA provided with speaker units SP aligned in a matrix shape as shown by Fig.l3A.
  • a speaker array 2OB having speaker units SP aligned in a honeycomb shape as shown by Fig.l3B.
  • a speaker array 2OC having speaker units SP aligned in a circular shape as shown by Fig.14.
  • the speaker units SP are aligned in a shape of a plurality of concentric circles, the speaker units SP may be aligned in a shape of a single circle.
  • the embodiment is not limited thereto .
  • the invention may be applied to an apparatus for outputting a voice to a specific listener, for example, the invention may be applied to an audio apparatus or an AV (Audio-Video) apparatus or the like for outputting music, song voice or the like to a specific listener.
  • an audio apparatus or an AV (Audio-Video) apparatus or the like for outputting music, song voice or the like to a specific listener.
  • AV Audio-Video

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Telephonic Communication Services (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

La présente invention a trait à un appareil de transmission/réception de signal vocal comportant: un corps de dispositif; un système de haut-parleur dans le corps de dispositif et comprenant une pluralité d'unités de haut-parleur en réseau et un système de microphone disposé dans le corps de dispositif et comprenant une pluralité de microphones en réseau. Grâce à l'intégration du système de haut-parleur et du système de microphone, il est possible d'améliorer l'exploitabilité par un utilisateur, pour informer l'utilisateur de manière relativement simple d'une erreur de position de réglage et de rendre le dispositif compact.
PCT/JP2006/305198 2005-09-15 2006-03-09 Appareil de haut-parleur et appareil de conference vocale WO2007032108A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2005268222A JP4867248B2 (ja) 2005-09-15 2005-09-15 スピーカ装置及び音声会議装置
JP2005-268222 2005-09-15
JP2005-306687 2005-10-21
JP2005306687A JP4929673B2 (ja) 2005-10-21 2005-10-21 音声会議装置

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WO2010020162A1 (fr) * 2008-08-19 2010-02-25 深圳华为通信技术有限公司 Procédé, dispositif de communication et système de communication pour commander une focalisation sonore
WO2014161309A1 (fr) * 2013-08-19 2014-10-09 中兴通讯股份有限公司 Procédé et appareil pour qu'un terminal mobile mette en œuvre un suivi de source vocale
AU2014221324B2 (en) * 2010-10-21 2016-09-29 Acoustic 3D Holdings Pty Ltd Acoustic diffusion generator
US10051400B2 (en) 2012-03-23 2018-08-14 Dolby Laboratories Licensing Corporation System and method of speaker cluster design and rendering
CN111343411A (zh) * 2020-03-20 2020-06-26 青岛海信智慧家居系统股份有限公司 一种智能远程视频会议系统

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010020162A1 (fr) * 2008-08-19 2010-02-25 深圳华为通信技术有限公司 Procédé, dispositif de communication et système de communication pour commander une focalisation sonore
AU2014221324B2 (en) * 2010-10-21 2016-09-29 Acoustic 3D Holdings Pty Ltd Acoustic diffusion generator
AU2016210715B2 (en) * 2010-10-21 2018-04-26 Acoustic 3D Holdings Pty Ltd Acoustic Diffusion Generator
US10051400B2 (en) 2012-03-23 2018-08-14 Dolby Laboratories Licensing Corporation System and method of speaker cluster design and rendering
WO2014161309A1 (fr) * 2013-08-19 2014-10-09 中兴通讯股份有限公司 Procédé et appareil pour qu'un terminal mobile mette en œuvre un suivi de source vocale
CN111343411A (zh) * 2020-03-20 2020-06-26 青岛海信智慧家居系统股份有限公司 一种智能远程视频会议系统
CN111343411B (zh) * 2020-03-20 2021-07-06 青岛海信智慧家居系统股份有限公司 一种智能远程视频会议系统

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