JPS62237817A - Echo canceller - Google Patents
Echo cancellerInfo
- Publication number
- JPS62237817A JPS62237817A JP8133386A JP8133386A JPS62237817A JP S62237817 A JPS62237817 A JP S62237817A JP 8133386 A JP8133386 A JP 8133386A JP 8133386 A JP8133386 A JP 8133386A JP S62237817 A JPS62237817 A JP S62237817A
- Authority
- JP
- Japan
- Prior art keywords
- loss
- echo
- state
- howling
- signal
- 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
- 238000003780 insertion Methods 0.000 claims abstract description 21
- 230000037431 insertion Effects 0.000 claims abstract description 21
- 230000010255 response to auditory stimulus Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 12
- 230000006866 deterioration Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000002592 echocardiography Methods 0.000 description 6
- 230000003044 adaptive effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000002411 adverse Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、衛星通信等長距離回路やテレコンファレンス
システム等における反響を制御するための反響消去装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an echo canceling device for controlling echoes in long-distance circuits such as satellite communications, teleconference systems, and the like.
従来の技術
近年、長距離回線、特に衛星通信の急激な増加やテレコ
ンファレンスシステムの実用化ニ伴い、明瞭で自然な音
声伝達が望まれている。反響信号は送話者の発生した信
号が受話側での反射等により送話者側に戻ってくる現象
であるが、長距離回線や音響系を含むテレコンファレン
スシステムでは、長い遅延の反響が存在するため通話品
質の劣化を生じている。最近では、この反響を消去する
適応型の反響消去装置が実用化されつつあるが、これら
は遠隔動作型であり（遠端話者の声で反響路を同定して
いる）近端話者の有無を検出するだけでなく、反響路の
変動を素早く検出し、音質の劣化やハウリングを抑圧し
なければならない。例えば、日本電気（株）の伊藤らに
よる「テレコンファレンス用音声伝送装置」昭和６９年
電子通信学会通信部門全国大会６９１）
以下図面を参照しながら、上述したような従来の反響消
去装置について説明する。2. Description of the Related Art In recent years, with the rapid increase in long-distance lines, especially satellite communications, and the practical use of teleconference systems, clear and natural voice transmission has been desired. Reverberation signals are a phenomenon in which a signal generated by a speaker returns to the speaker due to reflection on the receiver, but in teleconference systems that include long-distance lines and acoustic systems, long-delayed echoes occur. This causes deterioration in call quality. Recently, adaptive echo cancelers that cancel this echo are being put into practical use, but these are remote-operated devices (identifying the echo path based on the far-end speaker's voice). In addition to detecting the presence or absence, it is also necessary to quickly detect changes in the echo path and suppress sound quality deterioration and howling. For example, "Teleconference Audio Transmission Device" by Ito et al. of NEC Corporation, 1986, National Conference of the Telecommunications Division of the Institute of Electronics and Communication Engineers, No. 691) The conventional echo canceling device as described above will be explained below with reference to the drawings. .
第４図は従来の反響消去装置の構成を示すものである。FIG. 4 shows the configuration of a conventional echo canceling device.
第４図に寂いて、１は受信側入力端子、２は受信側出力
端子、３は送信側入力端子、４は送信側出力端子、２１
は適応型エコーキャンセラで受信側出力端子２から送信
側出力端子４へ戻ってくるエコーを消去する。２２は補
助サプレッサであり受信入力信号と送信出力信号を比較
し、送話か受話かを判定して、送話の時には受信入力に
損失を加え、受話の時には送信出力に損失を加える。4, 1 is the receiving side input terminal, 2 is the receiving side output terminal, 3 is the transmitting side input terminal, 4 is the transmitting side output terminal, 21
is an adaptive echo canceller that cancels the echo returning from the receiving output terminal 2 to the transmitting output terminal 4. Reference numeral 22 denotes an auxiliary suppressor which compares the received input signal and the transmitted output signal, determines whether it is transmitting or receiving, and adds a loss to the receiving input when transmitting, and adds a loss to the transmitting output when receiving.
第６図は補助サプレッサ２２の構成を示すものである。FIG. 6 shows the configuration of the auxiliary suppressor 22.
２３は受信入力信号レベルと送信出力信号レベルを比較
する比較手段であり、受話の時は″１′、送話の時は１
０′を出力する。２４は受信入力に損失を加える受話側
損失手段であり、比較手段２３が′１′で損失無し、比
較手段２３が′″０′で損失有りになる。損失の量は予
め決めておく。２６は送信信号に損失を加える送話側損
失手段であり、比較手段２３が′″０′で損失無し、比
較手段２３が嘗′で損失有りになる。Reference numeral 23 is a comparison means for comparing the received input signal level and the transmitted output signal level.
Outputs 0'. Reference numeral 24 is a receiving side loss means that adds loss to the received input; when the comparing means 23 is '1', there is no loss, and when the comparing means 23 is '0', there is a loss. The amount of loss is determined in advance.26 is a transmitting side loss means that adds loss to the transmitted signal, and when the comparing means 23 is ``0'', there is no loss, and when the comparing means 23 is ``0'', there is a loss.
以上のように構成された反響消去装置について、以下そ
の動作について説明する。The operation of the echo canceling device configured as described above will be explained below.
まず、遠端話者の音声信号は受信入力Ｒ１として受信側
入力端子１．補助サプレッサ２２を経て適応型エコーキ
ャンセラ２１に供給される。′！た、信号Ｒ１は受信側
出力端子２よシ近端話者へ受話信号Ｒ０として送られる
。近端話者信号のない場合、信号Ｒ０は反響路を経て、
送信側入力端子３に送信入力Ｓｉ として入る。適応型
エコーキャンセラ２１では送信側出力信号Ｓ０（消去残
信号とも呼ぶ）が零になるように受信入力Ｒ１の系列と
送信出力Ｓ０から疑似反響路を作る。このようにして反
響信号は消去されるが、近端話者が存在する場合、反響
路の推定がうまく行う事ができない。First, the far-end speaker's voice signal is input to the receiving input terminal 1 as the receiving input R1. The signal is supplied to an adaptive echo canceller 21 via an auxiliary suppressor 22. ′! In addition, the signal R1 is sent to the near-end speaker from the receiving side output terminal 2 as a reception signal R0. In the absence of a near-end talker signal, signal R0 follows the echo path,
It enters the transmission side input terminal 3 as a transmission input Si. In the adaptive echo canceller 21, a pseudo echo path is created from the series of reception input R1 and the transmission output S0 so that the transmission side output signal S0 (also called cancellation residual signal) becomes zero. Although the echo signal is canceled in this way, if a near-end speaker is present, the echo path cannot be estimated successfully.
従って近端話者信号の有る場合を検出し、反響路の推定
を停止する。補助サプレッサ２２は、比較手段２３で受
信入力信号と送信出力信号を比較し、送話か受話かを判
定して、送話の時には受話側損失手段２４に損失を加え
、受話の時には送話側損失手段２６に損失を加える。補
助サプレッサ２２は、常に受信入力端子１から送信入力
端子４の間に予め決められた損失をくわえるように働き
、ノ１ウリングやエコーを抑圧する。Therefore, the presence of a near-end speaker signal is detected and estimation of the echo path is stopped. The auxiliary suppressor 22 compares the received input signal and the transmitted output signal with the comparing means 23, determines whether it is transmitting or receiving, and adds a loss to the receiving side loss means 24 when transmitting, and adds a loss to the transmitting side loss means when receiving. A loss is added to the loss means 26. The auxiliary suppressor 22 always acts to add a predetermined loss between the reception input terminal 1 and the transmission input terminal 4, suppressing noise ringing and echo.
発明が解決しようとする問題点
しかしながら上記の構成では、反響路が変動した場合、
一時的に適応型エコーキャンセラの反響消去が劣化しエ
コーが多くなったり、ハウリングを生じる事がある。そ
こで、反響路の変動による前記の悪影響を防ぐために補
助サプレッサの損失を大きくすることがあるが、エコー
キャンセラの特長である双方向同時通話性が劣化してく
るという欠点を有していた。Problems to be Solved by the Invention However, in the above configuration, when the echo path changes,
The echo cancellation of the adaptive echo canceller may temporarily deteriorate, resulting in more echoes or howling. Therefore, in order to prevent the above-mentioned adverse effects caused by fluctuations in the echo path, the loss of the auxiliary suppressor may be increased, but this has the disadvantage that the two-way simultaneous communication capability, which is a feature of echo cancellers, deteriorates.
本発明は上記問題点に鑑み、反響路の変動によるエコー
やハウリングを抑圧し、さらに双方向同時通話性の劣化
を最小限に抑える事ができる反響消去装置を提供するも
のである。SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides an echo canceling device that can suppress echoes and howling caused by fluctuations in the echo path, and can further minimize deterioration in simultaneous two-way communication.
問題点を解決するだめの手段
この目的を達成するために本発明の反響消去装置は、エ
コーキャンセラと近端話者の有無を検出し、エコーキャ
ンセラの反響路の同定を制御する双方向同時通話検出器
と音声スイッチと準鳴音状態やハウリングを検出し音声
スイッチの損失量を制御するハウリング検出器とから構
成されている。Means for Solving the Problem To achieve this objective, the echo canceller of the present invention detects the presence or absence of an echo canceller and a near-end talker, and controls the identification of the echo path of the echo canceller. It consists of a detector, an audio switch, and a howling detector that detects quasi-sounding conditions and howling to control the loss amount of the audio switch.
作用
この構成によって、近端話者の無い時はエコーキャンセ
ラが反響路を同定し反響信号を消去する。With this configuration, the echo canceller identifies the echo path and cancels the echo signal when there is no near-end talker.
近端話者が発声したり反響路が変動した初期は、双方向
同時通話検出器により反響路の同定を停止する。このよ
うな近端話者による誤った反響路の同定は行われないが
、反響路の変動の初期には、エコーが多くなり準鳴音状
態やハウリングを生じる可能性がある。そこで、ハウリ
ング検出器が準鳴音状態やハウリングを検出し、鳴音余
裕度を演算する。ハウリング検出器で演算された鳴音余
裕度と予め決められていた鳴音余裕度との差を演算し、
この差を音声スイッチの損失とする。音声スイッチは送
話、受話を判定し従来例と同様に損失を挿入する。この
時挿入される損失量は、エコーキャンセラの反響消去効
果に応じた量となっている。このため、挿入される損失
は必要最小限になっており音声スイッチによる双方向同
時通話性の劣化を最小限に抑え、ハウリングを起こさな
い信頼性の高い反響消去装置とすることができることと
なる。At the initial stage when the near-end speaker speaks or the echo path changes, the two-way simultaneous conversation detector stops identifying the echo path. Such erroneous identification of the echo path by the near-end speaker is not performed, but in the early stages of fluctuations in the echo path, there is a possibility that there will be a large number of echoes, resulting in a quasi-ringing state or howling. Therefore, the howling detector detects the quasi-sounding state and howling, and calculates the noise margin. Calculate the difference between the sound margin calculated by the howling detector and the predetermined sound margin,
This difference is taken as the loss of the audio switch. The voice switch determines whether the call is sent or received and inserts a loss as in the conventional example. The amount of loss inserted at this time is an amount corresponding to the echo cancellation effect of the echo canceller. Therefore, the inserted loss is kept to the necessary minimum, and deterioration in simultaneous two-way communication due to the voice switch is minimized, making it possible to provide a highly reliable echo canceling device that does not cause howling.
実施例
以下本発明の一実施例について、図面全参照しながら説
明する。第１図は本発明の一実施例における反響消去装
置の構成を示すものである。第１図において、１は受信
側入力端子、２は受信側出力端子、３は送信側入力端子
、４は送信側出力端子である。以上は第２図の構成と同
じものである。EXAMPLE An example of the present invention will be described below with reference to all the drawings. FIG. 1 shows the configuration of an echo canceling device in one embodiment of the present invention. In FIG. 1, 1 is a receiving side input terminal, 2 is a receiving side output terminal, 3 is a transmitting side input terminal, and 4 is a transmitting side output terminal. The above configuration is the same as the configuration shown in FIG.
５はエコーキャンセラで受信側出力端子から送信側出力
端子へ戻ってくるエコーを消去する。６は双方向同時通
話検出器で近端話者の有無を検出しエコーキャンセラ６
の制御を行う。７は準鳴音状態やハウリングを検出し音
声スイッチ８の挿入損失を制御するハウリング検出器で
ある。Reference numeral 5 denotes an echo canceller that cancels echoes returning from the receiving side output terminal to the transmitting side output terminal. 6 is a two-way simultaneous call detector that detects the presence or absence of a near-end speaker and an echo canceller 6.
control. A howling detector 7 detects a quasi-sounding state and howling and controls the insertion loss of the audio switch 8.
第２図は第１図中の音声スイッチ８の構成図である。第
２図において、１１は受信側入力信号レベルと送信側出
力信号レベルを検出し受話状態か送話状態かを判定する
判定手段、１２は・・ウリング検出器７から鳴音余裕度
を受け受信入力および送信出力に挿入する損失量を決め
る損失制御手段、１３は損失制御手段１２から送られて
くる挿入損失を受信側入力信号に与える受信側損失手段
、１４は損失制御手段１２から送られてくる挿入損失を
送信側出力信号に与える送信側損失手段である。FIG. 2 is a block diagram of the audio switch 8 in FIG. 1. In FIG. 2, reference numeral 11 detects the input signal level on the receiving side and the output signal level on the transmitting side and determines whether it is in the receiving state or the transmitting state, and 12 receives the sound margin from the ring detector 7 and receives the signal. Loss control means 13 determines the amount of loss to be inserted into the input and transmission output; 13 is a receiving side loss means for applying the insertion loss sent from the loss control means 12 to the receiving side input signal; 14 is a receiving side loss means 14 which is sent from the loss control means 12 This is a transmitting side loss means that gives the following insertion loss to the transmitting side output signal.
第３図は第１図中の損失制御手段の構成図を示すもので
ある。第３図において、１６はハウリング検出器７から
送られてくる鳴音余裕度と、予め決められた鳴音余裕度
から挿入損失を演算する損失演算手段、１６は挿入損失
を更新する損失更新手段、１７は挿入損失を記憶する損
失記憶手段である。FIG. 3 shows a block diagram of the loss control means in FIG. 1. In FIG. 3, 16 is a loss calculation means for calculating insertion loss from the sound margin sent from the howling detector 7 and a predetermined sound margin, and 16 is a loss update means for updating the insertion loss. , 17 is a loss storage means for storing insertion loss.
以上の様に構成された反響消去装置について、以下その
動作を説明する。The operation of the echo canceling device configured as described above will be explained below.
まず、遠端話者の音声信号は受信人力Ｒ，として受信側
入力端子１．音声スイッチ８を経てエコーキャンセラ６
に供給される。また、信号Ｒ，は受信側出力端子２より
近端話者へ受話信号Ｒ０として送られる。近端話者信号
のない場合、信号曳は反響路を経て、送信側入力端子３
に送信入力Ｓｉとして入る。エコーキャンセラ６では消
去残信号が零になるように受信人力Ｒ１の系列と消去残
信号から疑似反響路を作る。このようにして、反響信号
は消去されるが、近端話者が存在する場合、反響路の推
定をうまく行う事ができない。従って、双方向同時通話
検出器６により近端話者信号の有る場合を検出し、エコ
ーキャンセラ５の反響路の同定を停止する。しかし、反
響路が変動した場合、変動初期や遠端話者が発声してい
ないとエコーキャンセラの反響消去効果が劣化し、準鳴
音状態やハウリングを生じる可能性がある。そこで本実
施例では、ハウリング検出器７により準鳴音状態やハウ
リング状態を検出し、鳴音余裕度を演算し音声スイッチ
８に送る。音声スイッチ８では、損失制御手段１２でハ
ウリング検出器７から送られてきた鳴音余裕度と予め定
められた鳴音余裕度を基に、受信側損失手段１３．送信
側損失手段１４の挿入損失量を演算する。判定手段１１
で受話状態か送話状態かを判定し、受話状態ならば送信
側損失手段１４を動作させ、送話状態ならば受話側損失
手段１３を動作させる。第３図に示す損失制御手段１２
では、まず損失演算手段１５で予め定められた鳴音余裕
度とハウリング検出器７から送られてくる鳴音余裕度の
差を演算し挿入損失とする。First, the far-end speaker's voice signal is input to the receiving side input terminal 1. Echo canceller 6 via audio switch 8
is supplied to Further, the signal R, is sent from the receiving side output terminal 2 to the near-end speaker as a received signal R0. If there is no near-end talker signal, the signal trail passes through the echo path to the transmitter input terminal 3.
is entered as the transmission input Si. The echo canceller 6 creates a pseudo echo path from the series of receiving human power R1 and the cancellation residual signal so that the cancellation residual signal becomes zero. In this way, the echo signal is canceled, but if a near-end speaker is present, the echo path cannot be estimated successfully. Therefore, the two-way simultaneous conversation detector 6 detects the presence of a near-end speaker signal, and the echo canceller 5 stops identifying the echo path. However, when the echo path fluctuates, the echo canceling effect of the echo canceller deteriorates in the early stages of the fluctuation or when the far-end speaker is not speaking, potentially causing a quasi-sounding state or howling. Therefore, in this embodiment, the howling detector 7 detects the quasi-sounding state and the howling state, calculates the sound margin and sends it to the audio switch 8. In the audio switch 8, the loss control means 12 uses the receiving side loss means 13. based on the sound margin sent from the howling detector 7 and the predetermined sound margin. The insertion loss amount of the transmission side loss means 14 is calculated. Judgment means 11
It is determined whether it is in the receiving state or the transmitting state, and if it is in the receiving state, the transmitting side loss means 14 is activated, and if it is in the transmitting state, the receiving side loss means 13 is activated. Loss control means 12 shown in FIG.
First, the loss calculating means 15 calculates the difference between the predetermined sound margin and the sound margin sent from the howling detector 7, and determines the insertion loss.
損失更新手段１６では、損失記憶手段１７で記憶してい
る挿入損失と今回演算した挿入損失とを比較し、挿入損
失の大きい方を挿入損失として損失記憶手段１７に記憶
させ、これ全挿入損失として用いる。また、判定手段１
１が受話状態であると判定し今回演算した挿入損失が損
失記憶手段１７の挿入損失より小さい場合は、記憶した
挿入損失を僅かに減少させる。The loss updating means 16 compares the insertion loss stored in the loss storage means 17 with the insertion loss calculated this time, stores the larger insertion loss in the loss storage means 17 as the insertion loss, and stores this as the total insertion loss. use In addition, determination means 1
If it is determined that 1 is in the receiving state and the insertion loss calculated this time is smaller than the insertion loss in the loss storage means 17, the stored insertion loss is slightly decreased.
以上のように本実施例によれば、近端話者の無い時には
、エコーキャンセラが反響路を同定し反響信号を消去す
ることができる。近端話者が発声した場合には、双方向
同時通話検出器によりこれを検出しエコーキャンセラの
反響路の同定全停止する。反響路が変動し、エコーキャ
ンセラの同定が間に合わないため準鳴音状態やハウリン
グが生じるような場合には、ハウリング検出器によシ鳴
音余裕度の劣化を検出し、予め定められた鳴音余裕度に
なるように音声スイッチの挿入損失を演算し、音声スイ
ッチによシ準鳴音やハウリングを抑圧することが出来る
こととなる。さらに、エコーキャンセラの反響消去効果
が改善されれば音声スイッチの挿入損失を減少させ双方
向同時通話性を最善の状態にすることが出来る。As described above, according to this embodiment, when there is no near-end speaker, the echo canceller can identify the echo path and cancel the echo signal. When the near-end speaker utters a voice, the two-way simultaneous conversation detector detects this and stops the echo canceller from identifying the echo path. If the echo path changes and the echo canceller cannot be identified in time, resulting in quasi-sounding conditions or howling, the howling detector detects the deterioration of the sound margin and cancels the predetermined sound. By calculating the insertion loss of the audio switch so that it has a margin, it becomes possible to suppress quasi-sounding noise and howling using the audio switch. Furthermore, if the echo cancellation effect of the echo canceller is improved, the insertion loss of the voice switch can be reduced and simultaneous two-way conversation performance can be maximized.
発明の効果
以上の様に本発明は、近端話者の無い時には、エコーキ
ャンセラが反響路を同定し反響信号全消去することがで
きる。近端話者が発声した場合には、双方向同時通話検
出器によりこれを検出しエコーキャンセラの反響路の同
定を停止する。反響路が変動し、エコーキャンセラの同
定が間に合わないため準鳴音状態やハウリングが生じる
ような場合には、・・ウリング検出器により４音余裕度
の劣化を検出し、予め定められた鳴音余裕度になるよう
に音声スイッチの挿入損失を演算し、音声スイッチによ
り準鳴音やハウリングを抑圧することが出来る。この時
挿入される損失は、予め定められだ鳴音余裕になるだけ
の必要最小の損失量になっており、双方向同時通話性の
劣化を最小限に留め、ハウリングや準鳴音を生じること
の無い反響消去装置とすることができ、その実用的効果
は犬なるものである。As described above, in the present invention, when there is no near-end speaker, the echo canceller can identify the echo path and completely cancel the echo signal. When the near-end speaker utters a voice, the two-way simultaneous conversation detector detects this and stops the echo canceller from identifying the echo path. If the echo path fluctuates and the echo canceller cannot be identified in time, causing quasi-sounding conditions or howling, the Uring detector detects the deterioration of the four-tone margin, and the echo canceller is not identified in time. By calculating the insertion loss of the audio switch so that it has a margin, it is possible to suppress quasi-sounding noise and howling using the audio switch. The loss inserted at this time is the minimum necessary loss amount to provide a predetermined noise margin, minimizing deterioration of simultaneous two-way communication performance and preventing howling and quasi-sounding from occurring. It can be used as an echo cancellation device without any noise, and its practical effect is similar to that of a dog.
第１図は本発明の一実施例における反響消去装置の構成
を示すブロック図、第２図は同本実施例における音声ス
イッチのブロック図、第３図は第２図の損失制御手段の
構成を示すブロック図、第４図は従来の反響消去装置の
構成を示すブロック図、第６図は従来の補助サプレッサ
のブロック図である。
６・・・・・・エコーキャンセラ１６・・・・・・双方
向同時通話検出器、７・・・・・・ハウリング検出器、
８・・・・・・音声スイッチ、１１・・・・・・判定手
段、１２・・・・・・損失制御手段、１３・・・・・・
受信側損失手段、１４・・・・・・送信側損失手段１１
６・・・・・・損失演算手段、１６・・・・・・損失更
新手段１１７・・・・・・損失記憶手段。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
Ｌ−−−−−Ｊ
第３図
第４図
第５図FIG. 1 is a block diagram showing the configuration of an echo canceling device in one embodiment of the present invention, FIG. 2 is a block diagram of an audio switch in the same embodiment, and FIG. 3 is a block diagram showing the configuration of the loss control means in FIG. 2. FIG. 4 is a block diagram showing the configuration of a conventional echo canceler, and FIG. 6 is a block diagram of a conventional auxiliary suppressor. 6... Echo canceller 16... Two-way simultaneous call detector, 7... Howling detector,
8... Voice switch, 11... Judgment means, 12... Loss control means, 13...
Receiving side loss means, 14... Transmitting side loss means 11
6...Loss calculation means, 16...Loss updating means 117...Loss storage means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure L----J Figure 3 Figure 4 Figure 5
Claims (2)
性を適応的に模擬し、送信側入力信号に含まれる反響信
号を消去するエコーキャンセラと、双方向同時通話等の
近端話者の有無を検出し前記エコーキャンセラの反響路
の同定を制御する双方向同時通話検出器と、準鳴音状態
及びハウリング状態を検出し鳴音余裕度を演算するハウ
リング検出器と、前記ハウリング検出器から鳴音余裕度
を受け受信側入力と送信側出力の損失を制御する音声ス
イッチとを備えたことを特徴とする反響消去装置。(1) An echo canceller that adaptively simulates the characteristics of the echo path from the receiving side output signal and the transmitting side input signal and canceling the echo signal included in the transmitting side input signal, and a near-end speaker for simultaneous two-way communication, etc. a two-way simultaneous conversation detector that detects the presence or absence of the echo canceller and controls the identification of the echo path of the echo canceller, a howling detector that detects a quasi-sounding state and a howling state and calculates a sound margin, and the howling detector 1. An echo canceling device comprising: an audio switch that controls loss of receiving side input and transmitting side output in response to sound margin from the echo canceller.
る判定手段と、受信側信号に損失を挿入する受信側損失
手段と、送信側信号に損失を挿入する送信側損失手段と
、前記受信側損失手段と前記送信側損失手段の挿入損失
量を、ハウリング検出器で演算された鳴音余裕度から演
算する損失制御手段で構成したことを特徴とする特許請
求の範囲第１項記載の反響消去装置。(2) The audio switch includes a determining means for determining whether the voice is in a receiving state or a transmitting state, a receiving side loss means for inserting a loss into a receiving side signal, a transmitting side loss means for inserting a loss into a transmitting side signal, and the above-mentioned. Claim 1, characterized in that the receiver comprises a loss control means that calculates the insertion loss amount of the receiving side loss means and the transmitting side loss means from the noise margin calculated by the howling detector. Echo canceller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8133386A JPS62237817A (en) | 1986-04-09 | 1986-04-09 | Echo canceller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8133386A JPS62237817A (en) | 1986-04-09 | 1986-04-09 | Echo canceller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62237817A true JPS62237817A (en) | 1987-10-17 |
Family
ID=13743453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8133386A Pending JPS62237817A (en) | 1986-04-09 | 1986-04-09 | Echo canceller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62237817A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5120609A (en) * | 1974-08-12 | 1976-02-19 | Nippon Electric Co | TSUWAROSON SHITSUSEIGYOHOSHIKI |
| JPS613536A (en) * | 1984-06-18 | 1986-01-09 | Toshiba Corp | Echo signal canceller |
-
1986
- 1986-04-09 JP JP8133386A patent/JPS62237817A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5120609A (en) * | 1974-08-12 | 1976-02-19 | Nippon Electric Co | TSUWAROSON SHITSUSEIGYOHOSHIKI |
| JPS613536A (en) * | 1984-06-18 | 1986-01-09 | Toshiba Corp | Echo signal canceller |
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