JPH06350486A - Sound communications system - Google Patents
Sound communications systemInfo
- Publication number
- JPH06350486A JPH06350486A JP13421193A JP13421193A JPH06350486A JP H06350486 A JPH06350486 A JP H06350486A JP 13421193 A JP13421193 A JP 13421193A JP 13421193 A JP13421193 A JP 13421193A JP H06350486 A JPH06350486 A JP H06350486A
- Authority
- JP
- Japan
- Prior art keywords
- acoustic
- sound
- communication system
- transmission path
- transmission
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は例えば通信会議装置等
に利用することができる音響通信方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic communication system which can be used in, for example, a communication conference device.
【0002】[0002]
【従来の技術】図4に従来の音響通信方式を説明するた
めのブロック図を示す。図中10A及び10Bは遠隔地
に設置された装置を示す。これら装置10A及び10B
は伝送路3によって通話が可能な状態に接続される。装
置10A,10Bはそれぞれマイクロホン1A(1B)
でとらえた音響信号を伝送路3に送出する音響検知増幅
手段4A(4B)と、伝送路3から入力される音響信号
をスピーカ2A(2B)から放音させる音響増幅手段5
A(5B)と、伝送路3に送出する音響信号及び伝送路
3から入力された音響信号のレベル、周波数特性等を制
御する音響制御手段6A(6B)とを具備して構成され
る。7A,7Bは室内におけるスピーカ2A(2B)と
マイクロホン1A(1B)間の音響結合を示す。2. Description of the Related Art FIG. 4 shows a block diagram for explaining a conventional acoustic communication system. In the figure, 10A and 10B indicate devices installed at remote locations. These devices 10A and 10B
Are connected by a transmission line 3 in a state in which a call can be made. The devices 10A and 10B are microphones 1A (1B), respectively.
The acoustic detection and amplification means 4A (4B) that sends out the acoustic signal captured by the above to the transmission path 3, and the acoustic amplification means 5 that outputs the acoustic signal input from the transmission path 3 from the speaker 2A (2B).
A (5B), and acoustic control means 6A (6B) for controlling the acoustic signal to be sent to the transmission path 3 and the level, frequency characteristics, etc. of the acoustic signal input from the transmission path 3. Reference numerals 7A and 7B denote acoustic coupling between the speaker 2A (2B) and the microphone 1A (1B) in the room.
【0003】音響制御手段6A(6B)には音声スイッ
チ、エコーキャンセラ等が設けれらる。音声スイッチは
入力信号のレベル及び出力信号のレベルに応じて適当な
損失を音響検知増幅手段4A,4Bに与え、ハウリング
などを抑制し、通話の確保を行なっている(例えば、N
TT研究実用化報告第37巻第2号(1988)帯域分
割形音声スイッチを用いた音声会議装置、及川他)。ま
たエコーキャンセラに関しては、音響結合7A(7B)
のようにスピーカ2A(2B)から出た音響が反射遅延
したものがマイクロホン1A(1B)に音響エコーとし
て入力されたものを音響制御手段6A(6B)で検出
し、手段4A,4B及び5A,5Bにおいて適切な信号
処理が施され相手装置に伝送される。(例えば、NTT
研究実用化報告37巻第2号(1988)複数反響エコ
ーキャンセラを用いた音声会議装置、及川他)。The sound control means 6A (6B) is provided with a voice switch, an echo canceller and the like. The voice switch provides an appropriate loss to the acoustic detection / amplification means 4A, 4B according to the level of the input signal and the level of the output signal, suppresses howling, and secures the call (for example, N.
TT Research Practical Report Vol. 37, No. 2 (1988) Voice conferencing device using band division type voice switch, Oikawa et al.). Regarding the echo canceller, acoustic coupling 7A (7B)
The sound control means 6A (6B) detects that the sound emitted from the speaker 2A (2B) is reflected and delayed and is input to the microphone 1A (1B) as an acoustic echo, and the means 4A, 4B and 5A, In 5B, appropriate signal processing is performed and the signal is transmitted to the partner device. (For example, NTT
Research Practical Use Report Vol. 37, No. 2 (1988) Audio conference device using multiple echo echo cancellers, Oikawa et al.
【0004】何れにしても従来は基本的には、装置10
A及び10Bのある音響空間のみを制御している。伝送
路3が2線式アナログ回線であった場合は、2線4線変
換を行なう場合に用いたハイブリッドトランスにより回
線エコーが生じる。この回線エコーに対する補償も行な
っているが、近年伝送路3のディジタル化に伴なって、
音響エコーのみの制御で事足りる状況にある。In any case, conventionally, the device 10 is basically the same.
Only the acoustic space with A and 10B is controlled. When the transmission line 3 is a two-wire type analog line, a line echo is generated by the hybrid transformer used when performing the two-wire to four-wire conversion. We have also compensated for this line echo, but with the recent digitization of the transmission line 3,
There is a situation where it is sufficient to control only acoustic echo.
【0005】[0005]
【発明が解決しようとする課題】音響制御手段6A(6
B)に設けられる、例えばエコーキャンセラ或は音声ス
イッチ等は、それぞれ自装置側の音響制御を行なってい
るに過ぎない。つまり時々刻々変化する通信相手の音響
条件の変化に追従できず、ハウリング・エコー等の発生
を許し、通話の確保がむずかしいといった問題がある。The sound control means 6A (6
The echo canceller, the voice switch, etc. provided in B) only perform the acoustic control on the device side. In other words, there is a problem that it is not possible to follow changes in the acoustic conditions of the communication partner that change from moment to moment, howling and echo are allowed to occur, and it is difficult to secure a call.
【0006】[0006]
【課題を解決するための手段】この発明では、マイクロ
ホンでとらえた音響信号を伝送路に送出する音響検出増
幅手段、伝送路から入力される音響信号を音として放音
する音響増幅手段、伝送路に送出する音響信号及び伝送
路から入力される音響信号のレベル、周波数特性等を制
御する音響制御手段とを具備した装置を用いて遠隔地間
で通信を行なう音響通信方式において、各装置間で音響
信号の転送と同時に実時間で音響制御情報の送受信を行
ない、相手側の装置を含む音響ループの状態を監視制御
することを特徴とする音響通信方式を提案する。According to the present invention, acoustic detection and amplification means for transmitting an acoustic signal captured by a microphone to a transmission path, acoustic amplification means for emitting an acoustic signal input from the transmission path as sound, and transmission path In an acoustic communication system in which communication is performed between remote locations by using an apparatus equipped with an acoustic control means for controlling the level, frequency characteristics, etc. of the acoustic signal to be transmitted to and the acoustic signal input from the transmission path, We propose an acoustic communication system characterized by transmitting and receiving acoustic control information in real time at the same time as transmitting acoustic signals, and monitoring and controlling the state of the acoustic loop including the other party's device.
【0007】この発明による音響通信方式によれば各装
置間で音響制御情報を共有することができるから自装置
のみならず、相手側の音響結合も含む音響ループの全て
を監視制御することができる。この結果遠隔地側の音響
環境の変化にも対応して音響制御が可能となるから、ハ
ウリング・エコー等の発生を阻止することができ、通話
の確保が確実となり強靱な音響通信制御が可能となる。According to the acoustic communication system of the present invention, since acoustic control information can be shared among the devices, not only the own device but also the entire acoustic loop including the acoustic coupling of the other party can be monitored and controlled. . As a result, acoustic control can be performed in response to changes in the acoustic environment on the remote side, so howling and echo can be prevented from occurring, and telephone conversations can be secured reliably, enabling robust acoustic communication control. Become.
【0008】また、この発明では請求項1で請求した音
響通信方式において、相手側の装置及び音響結合を含む
全ループ内の一巡利得が所定値を越える周波数を検出す
る手段と、この検出機能により検出した周波数の利得を
低下させる手段とを付加した音響通信方式を提案する。
この音響通信方式によればハウリングが生起する前にハ
ウリング周波数の予測が可能となるため、その検出され
た周波数に適度な損失を挿入し利得を低下させることに
より、ハウリングの抑圧制御が可能となる。Further, according to the present invention, in the acoustic communication system claimed in claim 1, there is provided means for detecting a frequency at which the loop gain in the entire loop including the device on the other side and the acoustic coupling exceeds a predetermined value, and this detecting function. We propose an acoustic communication system that adds a means for reducing the gain of the detected frequency.
According to this acoustic communication system, howling frequency can be predicted before howling occurs. Therefore, howling can be suppressed by inserting an appropriate loss in the detected frequency and reducing the gain. .
【0009】更にこの発明では音響制御情報の送受信伝
送形態を提案する。音響制御情報の送受信伝送形態とし
ては請求項3で提案する直接多重伝送方式と、請求項4
で提案する分離伝送方式とが考えられる。請求項3で提
案する直接多重伝送方式は音響信号中に自装置の音響情
報を埋め込み、受信側で分離する方式である。また請求
項4で提案する分離伝送方式は音響信号と音響制御情報
とを別回線により同時伝送する方式で、その伝送形態と
してはパケットによる論理多重、物理多重等を適用する
ことができる。Further, the present invention proposes a transmission / reception transmission mode of acoustic control information. As the transmission / reception transmission mode of the acoustic control information, the direct multiplex transmission method proposed in claim 3 and claim 4
The separation transmission method proposed in 1) is considered. The direct multiplex transmission system proposed in claim 3 is a system in which acoustic information of the own device is embedded in an acoustic signal and separated on the receiving side. The separate transmission system proposed in claim 4 is a system for simultaneously transmitting an acoustic signal and acoustic control information on a separate line, and as the transmission mode, logical multiplexing by packets, physical multiplexing and the like can be applied.
【0010】[0010]
【実施例】図1にこの発明による音響通信方式を説明す
るためのブロック構成図を示す。図1に示す符号10A
(10B),1A(1B),2A(2B),3,4A
(4B),5A(5B),6A(6B)は全て図4の説
明と同じである。この発明では音響制御手段6A,6B
の相互において、相手の音響制御情報8を授受して共有
させる。1 is a block diagram for explaining an acoustic communication system according to the present invention. Reference numeral 10A shown in FIG.
(10B), 1A (1B), 2A (2B), 3, 4A
All of (4B), 5A (5B), and 6A (6B) are the same as those described with reference to FIG. In this invention, the sound control means 6A, 6B
, The sound control information 8 of the other party is exchanged and shared.
【0011】音響制御情報としては音声スイッチ等の制
御情報、レベル監視情報、音響ループの周波数特性、残
響時間等を音響制御手段6A,6B間で授受し、相互に
共有する。更に付加価値情報としては空間的な音源位
置、音源の方向情報等を授受し、音源位置の再現を可能
にすることができる。図2及び図3に各装置10A,1
0Bでの周波数応答の例を示す。図2は定常状態の例を
示す。この定常状態であれば装置10A,10B間での
周波数応答は一巡利得が1を越えないのでハウリングを
生起することはない。As the acoustic control information, control information such as a voice switch, level monitoring information, frequency characteristics of an acoustic loop, reverberation time and the like are exchanged between the acoustic control means 6A and 6B and shared with each other. Further, as the value-added information, spatial sound source position, sound source direction information, and the like can be transmitted and received to enable reproduction of the sound source position. 2 and 3 each device 10A, 1
An example of the frequency response at 0B is shown. FIG. 2 shows an example of a steady state. In this steady state, the frequency response between the devices 10A and 10B does not cause howling because the loop gain does not exceed 1.
【0012】図3の例では装置10Aにおいて、室内の
状態が変化し、これに伴ない周波数応答が実線の状態か
ら破線の状態に変化したことを示す。これに伴ない、系
の位相特性にもよるが、周波数Pにおいて一巡利得が所
定値、例えば1を越えハウリングが生起する。音響制御
手段6Aと6Bは随時お互いの周波数応答を送受信して
いるため、音響制御手段6Aは相手側の音響制御手段6
Bからの周波数応答および、装置10Aにおける周波数
応答の両者の監視が可能となり、自装置における周波数
応答の変化過程でハウリングマージンが算出可能とな
る。従ってハウリングが生起する前にハウリング周波数
の予測が可能となるため、装置10Aは手段4Aと5A
を制御し、周波数Pに適度な損失を挿入することによ
り、ハウリングの抑圧制御を行なうこときができる。The example of FIG. 3 shows that in the apparatus 10A, the state of the room changes and the frequency response changes from the state of the solid line to the state of the broken line. Along with this, although depending on the phase characteristic of the system, the loop gain exceeds a predetermined value, for example 1, at the frequency P, and howling occurs. Since the sound control means 6A and 6B transmit and receive the frequency response of each other at any time, the sound control means 6A is the sound control means 6 on the other side.
Both the frequency response from B and the frequency response in the device 10A can be monitored, and the howling margin can be calculated in the process of changing the frequency response in the device itself. Therefore, it becomes possible to predict the howling frequency before the howling occurs, so that the device 10A uses the means 4A and 5A.
Is controlled and a proper loss is inserted in the frequency P, howling suppression control can be performed.
【0013】音響制御信号8の伝送形態は音響信号との
関係により(a)直接多重伝送方式と、(b)分離伝送
方式とが考えられる。(a)の直接多重伝送方式とは伝
送路3を音響信号と音響制御信号とで共用する方式であ
る。つまり音響制御信号を音響信号中に埋め込み、受信
側で分離する多重化伝送方式を指す。(b)の分離伝送
方式とは音響制御信号を別回線で伝送する方式を指し、
例えば制御用回線に他の回線の制御信号と共に多重化し
て伝送することができる。多重化の方法としてはパケッ
トによる論理多重、物理多重等の方法が考えられる。The transmission form of the acoustic control signal 8 may be (a) direct multiplex transmission system or (b) separated transmission system, depending on the relationship with the acoustic signal. The direct multiplex transmission method (a) is a method in which the transmission line 3 is shared by an acoustic signal and an acoustic control signal. In other words, it refers to a multiplex transmission system in which the acoustic control signal is embedded in the acoustic signal and separated on the receiving side. The separated transmission method of (b) refers to a method of transmitting the acoustic control signal on another line,
For example, it can be multiplexed with a control signal of another line and transmitted on a control line. As a multiplexing method, logical multiplexing by packets, physical multiplexing, etc. can be considered.
【0014】[0014]
【発明の効果】以上説明したように、この発明による音
響通信方式を用いることにより、音響信号と同時にその
音響制御信号を各装置間で共有することにより、時々刻
々変化する通信相手の音響条件の変化に追従が可能とな
り、通話の確保が保たれ、より強靱な音響通信が可能と
なる。As described above, by using the acoustic communication system according to the present invention, the acoustic control signal is shared between the devices at the same time as the acoustic signal, so that the acoustic condition of the communication partner that changes from moment to moment can be controlled. It becomes possible to follow the change, the call is kept secured, and more robust acoustic communication becomes possible.
【図1】この発明の一実施例を示すブロック図。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図2】この発明の動作を説明するための周波数特性
図。FIG. 2 is a frequency characteristic diagram for explaining the operation of the present invention.
【図3】この発明の動作を説明するための周波数特性
図。FIG. 3 is a frequency characteristic diagram for explaining the operation of the present invention.
【図4】従来の技術を説明するためのブロック図。FIG. 4 is a block diagram for explaining a conventional technique.
1A,1B マイクロホン 2A,2B スピーカ 3 伝送路 4A,4B 音響検出増幅手段 5A,5B 音響増幅手段 6A,6B 音響制御手段 7A,7B 音響結合 8 音響制御信号 1A, 1B Microphones 2A, 2B Speakers 3 Transmission lines 4A, 4B Acoustic detection amplification means 5A, 5B Acoustic amplification means 6A, 6B Acoustic control means 7A, 7B Acoustic coupling 8 Acoustic control signals
Claims (4)
路に送出する音響検知増幅手段、伝送路から入力される
音響信号を音として放音する音響増幅手段、伝送路に送
出する音響信号及び伝送路から入力された音響信号のレ
ベル、周波数特性等を制御する音響制御手段とを具備し
た装置を用いて遠隔地間で通信を行なう音響通信方式に
おいて、 各装置間で音響信号の転送と同時に実時間で音響制御情
報の送受信を行ない、相手側の装置の状態及び音響結合
を含む音響ループの状態等を監視制御することを特徴と
する音響通信方式。1. A sound detection / amplification means for transmitting an acoustic signal captured by a microphone to a transmission path, an acoustic amplification means for emitting an acoustic signal input from the transmission path as a sound, an acoustic signal and a transmission path for transmission to the transmission path. In an acoustic communication system that performs communication between remote locations using a device equipped with an acoustic control unit that controls the level, frequency characteristics, etc. of the acoustic signal input from the An acoustic communication system characterized in that the acoustic control information is transmitted and received by the device, and the state of the device on the other side and the state of the acoustic loop including acoustic coupling are monitored and controlled.
相手側の装置及び音響結合を含む全ループ内の一巡利得
が所定値を越える周波数を検出する手段と、この検出機
能により検出した周波数の利得を低下させる手段とを付
加したことを特徴とする音響通信方式。2. The acoustic communication system according to claim 1, wherein
A sound characterized by adding a means for detecting a frequency at which the loop gain in the entire loop including the device on the other side and the acoustic coupling exceeds a predetermined value, and a means for reducing the gain of the frequency detected by this detection function. Communication method.
と共に多重化伝送することを特徴とする音響通信方式。3. An acoustic communication system, wherein the acoustic control information according to claim 1 is multiplexed and transmitted together with an acoustic signal.
送路を通じて伝送することを特徴とする音響通信方式。4. An acoustic communication system, wherein the acoustic control information according to claim 1 is transmitted through an independent transmission path.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13421193A JPH06350486A (en) | 1993-06-04 | 1993-06-04 | Sound communications system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13421193A JPH06350486A (en) | 1993-06-04 | 1993-06-04 | Sound communications system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06350486A true JPH06350486A (en) | 1994-12-22 |
Family
ID=15123026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13421193A Pending JPH06350486A (en) | 1993-06-04 | 1993-06-04 | Sound communications system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06350486A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005011327A1 (en) * | 2003-07-23 | 2005-02-03 | Toa Corporation | Howling margin measuring device |
JP2008060938A (en) * | 2006-08-31 | 2008-03-13 | Yamaha Corp | Speech deciding device |
US11570545B2 (en) | 2020-11-12 | 2023-01-31 | Kabushiki Kaisha Toshiba | Acoustic inspection apparatus and acoustic inspection method |
-
1993
- 1993-06-04 JP JP13421193A patent/JPH06350486A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005011327A1 (en) * | 2003-07-23 | 2005-02-03 | Toa Corporation | Howling margin measuring device |
US7596238B2 (en) | 2003-07-23 | 2009-09-29 | Toa Corporation | Howling margin measuring device |
JP2008060938A (en) * | 2006-08-31 | 2008-03-13 | Yamaha Corp | Speech deciding device |
JP4678349B2 (en) * | 2006-08-31 | 2011-04-27 | ヤマハ株式会社 | Call determination device |
US11570545B2 (en) | 2020-11-12 | 2023-01-31 | Kabushiki Kaisha Toshiba | Acoustic inspection apparatus and acoustic inspection method |
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