JPH0383491A - Acoustic echo canceler device - Google Patents
Acoustic echo canceler deviceInfo
- Publication number
- JPH0383491A JPH0383491A JP1218501A JP21850189A JPH0383491A JP H0383491 A JPH0383491 A JP H0383491A JP 1218501 A JP1218501 A JP 1218501A JP 21850189 A JP21850189 A JP 21850189A JP H0383491 A JPH0383491 A JP H0383491A
- Authority
- JP
- Japan
- Prior art keywords
- echo
- training
- sound
- reverberation
- howling
- 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
- 230000005236 sound signal Effects 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000002592 echocardiography Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は遠隔会議システム等で発生するハウリングやエ
コー等の通話障害を防止する音響エコーキャンセラ装置
に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an acoustic echo canceller device that prevents call interference such as howling and echo that occurs in remote conference systems and the like.
（従来の技術）
従来この種の装置は遠隔会議システムの送受話回路に組
み込まれ、会議室の反響特性を常に学習して入力音声信
号のレベル等を制御することによって、出力側の音声が
入力側に回り込むことによＶ発生するエコーやハウリン
グ等を防止していた。(Prior art) Conventionally, this type of device has been incorporated into the transmitting/receiving circuit of a remote conference system, and by constantly learning the reverberation characteristics of the conference room and controlling the level of the input audio signal, the audio on the output side is This prevents echoes, howling, etc. caused by V-circuiting when it goes around to the side.
このような従来の装置では、当初トレーニング発生部を
マニュアルによって動作させてトレーニング信号を発生
させ、このトレーニング信号の反響音を入力することに
より、反響学習部がトレーニング信号のレベルと入力反
響音信号のレベルとをデジタル的に処理して、入力反響
音信号を打ち消すための基本反響特性を設定する。これ
以降は、前記反響学習部が会議室の反響特性の変動に追
従してこれを学習することによって、前記入力反響音信
号の打ち消し量を最適に制御することにより、エコーや
ハウリングの発生を防止していた。In such conventional devices, the training generator is initially operated manually to generate a training signal, and by inputting the echoes of this training signal, the echo learning unit adjusts the level of the training signal and the input echo signal. The level is digitally processed to set basic reverberation characteristics for canceling the input reverberation sound signal. From this point on, the reverberation learning section tracks and learns the fluctuations in the reverberation characteristics of the conference room, thereby optimally controlling the amount of cancellation of the input reverberant sound signal, thereby preventing the occurrence of echoes and howling. Was.
しかし、このような従来の装置でも、会議室の反響特性
が人や装置の移動等により急激に変化した場合、前記反
響学習部の学習が追従できなくなり、この結果ハウリン
グが起きて会議ができなくなる等の不都合があった。こ
のような不都合が生じると、前述した如く再度マニュア
ルにてトレーニング信号を発生させて、前記反響学習部
に基本反響特性を設定しなおさなければならず、手間が
かかつて会議の中断が長くなるという欠点があった。However, even with such conventional devices, if the reverberation characteristics of the conference room suddenly change due to movement of people or devices, the learning of the reverberation learning section will no longer be able to keep up, resulting in howling and making it impossible to hold a conference. There were other inconveniences. When such an inconvenience occurs, as mentioned above, it is necessary to manually generate the training signal again and reset the basic echo characteristics in the echo learning section, which is time consuming and results in long interruptions to the meeting. There were drawbacks.
（発明が解決しようとする課題〉
上記の如〈従来の音響エコーキャンセラ装置では、会議
室の反響特性が人や装置の移動等により急激に変化した
場合、反響学習部の学習が追従できなくなってハウリン
グを起こしてしまい、その都度毎にマニュアルにてトレ
ーニングを行って前記反響学習部に新たな基本反響特性
を再設定してやらなければならず、これに手間がかかつ
て会議の中断が長くなるという欠点があった。(Problems to be Solved by the Invention) As mentioned above, in conventional acoustic echo canceller devices, when the reverberation characteristics of a conference room change suddenly due to the movement of people or devices, the learning of the reverberation learning section becomes unable to follow the changes. When feedback occurs, manual training must be performed each time to re-set new basic echo characteristics in the echo learning section, which is time-consuming and leads to long conference interruptions. was there.
そこで本発明は上記の欠点を除去するもので、ハウリン
グが生じたような場合、自動的にトレーニングを行って
反響学習部に基本反響特性を再設定することができる音
響エコーキャンセラ装置を提供することを目的としてい
る。SUMMARY OF THE INVENTION Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and provides an acoustic echo canceller device that can automatically perform training and re-set basic echo characteristics in the echo learning section when howling occurs. It is an object.
（課題を解決するための手段）
本発明は当初トレーニング音声を所定時間発生し、この
トレーニング音声の反響音声信号を入力して会議室の基
本反響特性を反響学習部に設定した後、この反響学習部
に会議者の入力音声信号と伴に入力される反響音声信号
を打ち消すためのｉ適時性を前記基本反響特性に基づい
て常に学習させることにより、前記反響音声信号を打ち
消す音響用エコーキャンセラ装置において、ハウリング
等の通話障害を検出する検出手段と、この検出手段によ
って前記通話障害が検出されると、前記トレーニング音
声を発生させて前記反響学習部に新たな基本反響特性を
再設定するトレーニング制御手段とを具備した楕或を有
する。(Means for Solving the Problems) The present invention initially generates a training sound for a predetermined period of time, inputs the echo sound signal of this training sound, sets the basic reverberation characteristics of the conference room in the reverberation learning section, and then performs the reverberation learning. In an acoustic echo canceller device for canceling the echo audio signal by constantly learning i timeliness for canceling the echo audio signal inputted together with the input audio signal of the meeting person based on the basic echo characteristics. , a detection means for detecting a communication disturbance such as howling, and a training control means for generating the training sound and resetting a new basic echo characteristic in the echo learning section when the communication disturbance is detected by the detection means. It has an oval with
（作用〉
本発明の音響用エコーキャンセラ装置において、検出手
段はハウリング等の通話障害を検出する。トレーニング
制御手段は前記検出手段によって前記通話障害が検出さ
れると、前記トレーニング音声を発生させて前記反響学
習部に新たな基本反響特性を再設定する。(Function) In the acoustic echo canceller device of the present invention, the detection means detects a call disturbance such as howling.When the call disturbance is detected by the detection means, the training control means generates the training sound and generates the training sound. Reset new basic echo characteristics in the echo learning section.
（実施例〉
以下、本発明の一実施例を図面を参照して説明する。第
１図は本発明の音響エコーキャンセラ装置の一実施例を
示したブロック図である。１は会議者の音声を入力する
マイク、２は回線７を介して送られてきた相手方の音声
又はトレーニング発生部６より発生されたトレーニング
信号を拡声するスピーカ、３はマイク１から入力される
反響音信号とスピーカ２から拡声される出力音声信号と
から前記入力反響音信号の打ち消しレベルを常に学習し
て、エコーやハウリング等が起きないようにする反響学
習部、４はハウリングが生じたことを検出してこれを制
御部８に知らせるハウリング検出部、５は送信音声信号
と受信音声信号とを分離するハイブリット回路、６はト
レーニング信号を発生するトレーニング発生部、８はト
レーニング発生部６の起動／停止を行う制御部、９は制
御部８を動作させるか否かを切り替えるマニュアルスイ
ッチ、１０はマイク１から入力される反響音信号を打ち
消すための減算器である。(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a block diagram showing an embodiment of the acoustic echo canceller device of the present invention. 1 is a block diagram showing an embodiment of the acoustic echo canceller device of the present invention. 2 is a speaker for amplifying the other party's voice sent via the line 7 or the training signal generated from the training generator 6; 3 is the echo signal input from the microphone 1 and the speaker 2; a reverberation learning unit that always learns the cancellation level of the input reverberant sound signal from the output audio signal to be amplified to prevent echoes, howling, etc.; 4 detects the occurrence of howling and controls it; 5 is a hybrid circuit that separates the transmitted audio signal and the received audio signal; 6 is a training generator that generates a training signal; 8 is a controller that starts/stops the training generator 6; 9 is a manual switch for switching whether or not to operate the control section 8; 10 is a subtracter for canceling the echo sound signal input from the microphone 1;
次に本実施例の動作について説明する。まず、装置に電
源が投入されると、制御部８はトレーニング発生部６を
ＩＯ秒間程度起動して、トレーニング信号をスピーカ２
から拡声する。スピーカ２から拡声されたトレーニング
信号は会議室の音響特性にしたがって反響し、この反響
音１００がマイク１に捕らえられ、反響音信号となって
反響学習部３に入力される。反響学習部３は入力される
前記反響音信号のレベルとトレーニング発生部６から発
生されたトレーニング信号のレベル等をデジタル的に処
理して、前記反響音信号を打ち消すための基本反響特性
を設定する。Next, the operation of this embodiment will be explained. First, when the device is powered on, the control unit 8 activates the training generator 6 for approximately 10 seconds, and transmits the training signal to the speaker 2.
Amplify the sound from The training signal amplified from the speaker 2 is reverberated according to the acoustic characteristics of the conference room, and this reverberant sound 100 is captured by the microphone 1 and input into the reverberant learning section 3 as a reverberant sound signal. The echo learning unit 3 digitally processes the level of the input echo sound signal and the level of the training signal generated from the training generator 6, and sets basic echo characteristics for canceling the echo sound signal. .
その後会議が始まって、マイクｌから送信音声信号が入
力されると、これに伴って入力される反響音信号成分を
反響学習部３が学習し、この学習に応じて前記基本特性
を修正した最適反響特性に基づいて、前記この反響学習
部３は前記混入される反響音信号成分を打ち消す動作を
減算器１０を介して行う。この為、スピーカ２から会議
の相手方の音声が拡声されていてもハウリング等を生じ
ることなく、こちらの会議者の音声信号がハイブリット
回路５を介して回線７上に送出される。After that, when the conference starts and a transmitted audio signal is input from the microphone 1, the echo learning section 3 learns the echo sound signal component input along with this, and adjusts the basic characteristics according to this learning. Based on the echo characteristics, the echo learning section 3 performs an operation to cancel the mixed echo sound signal component via the subtracter 10. Therefore, even if the voice of the other party in the conference is amplified from the speaker 2, the voice signal of the other party in the conference is sent out onto the line 7 via the hybrid circuit 5 without causing howling or the like.
次に、人や装置の移動等によって会議室の反響特性が激
変した場合、反響学習部３はこの変化に追従して学習す
ることができず、マイク１から入力される反響音信号を
適切に打ち消すことができなくなり、所謂ハウリングが
生じる。ハウリング検出部４はこのハウリングが起きる
と、これを検出し、検出信号を制御部８に出力する。制
御部８はこのハウリング検出信号が入力されると、トレ
ーニング発生部６をＩＯ秒間程度起動して反響学習部３
のトレーニングを自動的に開始する。これによりスピー
カ２からトレーニング音声が拡声され、会議室の反響特
性に対応した反響音１００がマイク１に捕らえられ、反
響音信号が反響学習部３に入力される。これにより前述
したのと同様の動作によって、新たな基本反響特性が反
響学習部３に設定される。以降、反響学習部３はこの基
本反響特性にしたがって会議室の反響特性の変化を学習
して、マイク１から混入される反響音信号を適切に打ち
消す動作を再び行うことができる。Next, if the reverberation characteristics of the conference room change dramatically due to the movement of people or equipment, the reverberation learning section 3 will not be able to follow and learn from this change, and will not be able to properly adjust the reverberant sound signal input from the microphone 1. This can no longer be canceled out, and so-called howling occurs. When this howling occurs, the howling detection section 4 detects it and outputs a detection signal to the control section 8. When this howling detection signal is input, the control unit 8 activates the training generation unit 6 for about IO seconds to activate the echo learning unit 3.
automatically start training. As a result, the training audio is amplified from the speaker 2, a reverberation sound 100 corresponding to the reverberation characteristics of the conference room is captured by the microphone 1, and a reverberation sound signal is input to the reverberation learning section 3. As a result, a new basic echo characteristic is set in the echo learning section 3 by the same operation as described above. Thereafter, the reverberation learning section 3 can learn changes in the reverberation characteristics of the conference room according to the basic reverberation characteristics, and can again perform the operation of appropriately canceling the reverberant sound signal mixed in from the microphone 1.
本実施例によれば、会議室の反響特性が激変した時等に
、反響学習部３による学習の追従ができなくなった場合
にハウリング等が発生した場合、制御部８が自動的にト
レーニングを開始して、反響学習部３に新たな基本反響
特性を再設定することができるため、前記トレーニング
に手間がかからなくなり、会議の中断を最小限として、
常にハウリング等が起きない円滑な会議を行うことがで
きる。According to this embodiment, when howling or the like occurs when the echo learning unit 3 is no longer able to follow learning due to a drastic change in the reverberation characteristics of the conference room, the control unit 8 automatically starts training. As a result, a new basic echo characteristic can be re-set in the echo learning section 3, so the training can be done without much effort, and interruptions to the meeting can be minimized.
A smooth meeting can be held without any howling or the like.
尚、中断してはこまるような会議を行う場合には、電源
投入時の最初のトレーニングの後、スイッチ９をオンと
して制御部８の動作を無効としておけば、以降自動的に
トレーニングが開始されることを防止することもできる
。In addition, if you have a meeting that is difficult to interrupt, you can disable the operation of the control unit 8 by turning on the switch 9 after the initial training when the power is turned on, and the training will start automatically from then on. It is also possible to prevent this from happening.
以上記述した如く本発明の音響エコーキャンセラ装置に
よれば、ハウリングが生じたような場合、自動的にトレ
ーニングを行って反響学習部に基本反響特性を再設定す
ることができる。As described above, according to the acoustic echo canceller device of the present invention, when howling occurs, training can be automatically performed to reset the basic echo characteristics in the echo learning section.
【図面の簡単な説明】
第１図は本発明の音響エコーキャンセラ装置の一実施例
を示したブロック図である。
ｌ・・・マイク ２・・・スピーカ３・・・反
響学習部 ４・・・ハウリング検出部５・・・ハイ
ブリット回路
６・・・トレーニング発生部BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the acoustic echo canceller device of the present invention. l...Microphone 2...Speaker 3...Reverberation learning section 4...Howling detection section 5...Hybrid circuit 6...Training generation section
Claims (1)
ング音声の反響音声信号を入力して会議室の基本反響特
性を反響学習部に設定した後、この反響学習部に会議者
の入力音声信号と伴に入力される反響音声信号を打ち消
すための最適特性を前記基本反響特性に基づいて常に学
習させることにより、前記反響音声信号を打ち消す音響
用エコーキャンセラ装置において、ハウリング等の通話
障害を検出する検出手段と、この検出手段によって前記
通話障害が検出されると、前記トレーニング音声を発生
させて前記反響学習部に新たな基本反響特性を再設定す
るトレーニング制御手段とを具備したことを特徴とする
音響エコーキャンセラ装置。Initially, a training sound is generated for a predetermined period of time, and the echo sound signal of this training sound is input to set the basic reverberation characteristics of the conference room in the reverberation learning section, and then is input to this reverberation learning section together with the input audio signal of the conference participants. In the acoustic echo canceller device for canceling the echo voice signal by constantly learning the optimum characteristic for canceling the echo voice signal based on the basic echo characteristics, the detection means detects a communication disturbance such as howling; an acoustic echo canceller device comprising: training control means for generating the training voice and resetting new basic echo characteristics in the echo learning section when the call disturbance is detected by the detection means; .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1218501A JPH0383491A (en) | 1989-08-28 | 1989-08-28 | Acoustic echo canceler device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1218501A JPH0383491A (en) | 1989-08-28 | 1989-08-28 | Acoustic echo canceler device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0383491A true JPH0383491A (en) | 1991-04-09 |
Family
ID=16720919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1218501A Pending JPH0383491A (en) | 1989-08-28 | 1989-08-28 | Acoustic echo canceler device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0383491A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07183835A (en) * | 1993-12-22 | 1995-07-21 | Nec Corp | Echo canceler for conference |
| US5621724A (en) * | 1995-01-24 | 1997-04-15 | Nec Corporation | Echo cancelling device capable of coping with deterioration of acoustic echo condition in a short time |
| US6230244B1 (en) | 1997-06-12 | 2001-05-08 | Oki Electric Industry Co., Ltd. | Memory device with read access controlled by code |
-
1989
- 1989-08-28 JP JP1218501A patent/JPH0383491A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07183835A (en) * | 1993-12-22 | 1995-07-21 | Nec Corp | Echo canceler for conference |
| US5621724A (en) * | 1995-01-24 | 1997-04-15 | Nec Corporation | Echo cancelling device capable of coping with deterioration of acoustic echo condition in a short time |
| US6230244B1 (en) | 1997-06-12 | 2001-05-08 | Oki Electric Industry Co., Ltd. | Memory device with read access controlled by code |
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