JPH0418899A - Echo preventing device - Google Patents
Echo preventing deviceInfo
- Publication number
- JPH0418899A JPH0418899A JP2122311A JP12231190A JPH0418899A JP H0418899 A JPH0418899 A JP H0418899A JP 2122311 A JP2122311 A JP 2122311A JP 12231190 A JP12231190 A JP 12231190A JP H0418899 A JPH0418899 A JP H0418899A
- Authority
- JP
- Japan
- Prior art keywords
- audio signal
- studio
- classroom
- sound signal
- signal 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
- 230000005236 sound signal Effects 0.000 claims abstract description 96
- 230000005540 biological transmission Effects 0.000 claims abstract description 30
- 230000008054 signal transmission Effects 0.000 claims abstract description 10
- 230000002194 synthesizing effect Effects 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 description 11
- 238000002592 echocardiography Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- 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】
[産業上の利用分野]
この発明はスタジオと複数の教室からなる遠隔教育形態
において、スタジオと教室間で行われる質疑応答を全教
室に伝える際に、質問を発した教室に対して質問者の音
声がエコーとして戻ることを防止するエコー防止装置に
関するものである。[Detailed Description of the Invention] [Industrial Application Field] This invention is a distance learning system consisting of a studio and multiple classrooms, and a method for transmitting questions and answers between the studio and the classrooms to all classrooms. This invention relates to an echo prevention device that prevents a questioner's voice from returning to the classroom as an echo.
従来のエコー防止装置としては、
1)送話者側から相手方へ伝送された音声信号がスピー
カ等により再生される形態において、相手側の室内にお
けるスピーカとマイクロホンとが音響的に結合されるこ
とにより、送話者側の送出音声信号がエコーとして送話
者側に伝送される場合、相手側でスピーカの再生音量を
抑える、マイクロホンの指向性を高める、室内の反響を
抑える等により、スピーカで再生される音声信号がマイ
クロホンに再入力されに(い環境とする方式。Conventional echo prevention devices include: 1) In a form where the audio signal transmitted from the caller side to the other party is reproduced by a speaker, etc., the echo prevention device acoustically couples the speaker and microphone in the other party's room. If the audio signal sent from the caller side is transmitted to the caller side as an echo, the other party can reduce the playback volume of the speaker, increase the directivity of the microphone, suppress the echoes in the room, etc. A method that creates an environment in which the audio signal sent to the microphone is re-input into the microphone.
2)送話者側に相手側への音声信号送出中には、送話者
側に伝送される相手側からの音声信号の再生を停止させ
る装置(または電気回路)を設けることにより、エコー
を停止させる方式。2) While transmitting audio signals to the other party, a device (or an electric circuit) is installed on the speaker's side to stop the reproduction of the audio signal from the other party that is being transmitted to the speaker. Method of stopping.
3)送話者側に相手側へ送出中の音声信号と逆位相の信
号を生成して、相手側から伝送される音声信号と、この
逆位相の信号とを合成して、エコーを相殺させる装置(
または電気回路)を設けることにより、エコーを抑止さ
せる方式。3) Generate a signal on the sender's side that has the opposite phase to the audio signal being sent to the other party, and combine the audio signal transmitted from the other party with this anti-phase signal to cancel out the echo. Device(
A method of suppressing echoes by installing an electrical circuit (or electric circuit).
等がある。etc.
従来のエコー防止装置は以上のように構成されているの
で、1)の装置では送話者の相手側での環境が制約され
るため、マイクロホンの増設・移動等の自由度が無く、
2)のエコーを停止させる装置では、相手側への音声信
号送出中はエコーと共に相手側からの音声信号も同時に
聞えなくなり、3)のエコーを抑止させる装置では、送
話者側と相手側との間の伝送路での伝搬時間に応じて、
エコー信号を相殺するための逆位相信号を合成する遅延
時間を制御する必要があるため、装置(または電気回路
)が複雑化し高価になる等の問題点があった。Conventional echo prevention devices are configured as described above, so in the device 1), the environment at the other end of the caller is restricted, so there is no flexibility in adding or moving microphones, etc.
With the device that stops echoes (2), while the audio signal is being sent to the other party, you will not be able to hear the echo and the voice signal from the other party at the same time, and with the device that suppresses echoes (3), the voice signal between the sender and the other party will not be heard at the same time. Depending on the propagation time in the transmission path between
Since it is necessary to control the delay time for synthesizing anti-phase signals for canceling echo signals, there are problems such as the device (or electric circuit) becoming complicated and expensive.
この発明は上記のような問題点を解消するためになされ
たもので、送話者側に対する相手側からの音声信号を停
止することな(エコーを抑止できるとともに、装置構成
を複雑なものとすることなくエコー防止装置を実現する
ことを目的とする。This invention was made in order to solve the above-mentioned problems, and it is possible to prevent echoes from occurring without stopping the audio signal from the other party to the sender's side, and also to avoid complicating the device configuration. The purpose is to realize an echo prevention device without any noise.
[課題を解決するための手段]
この発明に係るエコー防止装置は、1ケ所のスタジオと
複数の教室との間に、スタジオから各教室に向けての音
声信号伝送路を2系統、各教室からスタジオへ向けての
音声信号伝送路を1系統、及びスタジオから各教室への
制御信号伝送路を1系統を設けるとともに、制御信号伝
送路を経由してスタジオから教室に設置される音声信号
選択装置を遠隔制御する遠隔制御装置とを具備したもの
である。[Means for Solving the Problems] The echo prevention device according to the present invention has two audio signal transmission lines between one studio and a plurality of classrooms, one from the studio to each classroom, and one from each classroom. One audio signal transmission line to the studio and one control signal transmission line from the studio to each classroom are provided, and an audio signal selection device is installed from the studio to the classroom via the control signal transmission line. It is equipped with a remote control device that remotely controls the.
[作用]
この発明におけるエコー防止装置は、スタジオのマイク
ロホンでの音声信号、及びこの音声信号に教室からスタ
ジオに伝送される音声信号を合成した音声信号を、スタ
ジオから教室に向けての音声信号伝送路を用いて伝送す
るとともに、スタジオのマイクロホンでの音声信号のみ
を、上記音声信号伝送路とは別の音声信号伝送路を用い
て伝送し、教室においては2系統の音声信号をスタジオ
の音声信号選択装置による遠隔操作により選択すること
により、相手側からの音声信号を停止させることなく、
エコーを抑止できるエコー防止効果の高いエコー防止装
置を簡単かつ安価に得ることを可能とする。[Function] The echo prevention device of the present invention transmits an audio signal from a studio microphone and an audio signal obtained by synthesizing this audio signal with an audio signal transmitted from the classroom to the studio. At the same time, only the audio signal from the microphone in the studio is transmitted using a separate audio signal transmission path from the above audio signal transmission path, and in the classroom, the audio signals of two systems are transmitted as the studio audio signal. By making the selection by remote control using the selection device, the audio signal from the other party is not interrupted.
To easily and inexpensively obtain an echo prevention device capable of suppressing echoes and having a high echo prevention effect.
〔実施例1
以下、この発明の一実施例を図について説明する。第1
図において、1はスタジオ側、2は教室側である。スタ
ジオ側にはマイクロホン3、このマイクロホン3に接続
された音声信号合成器4、この音声信号合成器4に接続
された音声信号分配器5、上記マイクロホン3に接続さ
れた音声信号分配器6、音声信号合成器7に接続された
音−車信号分配器8、この音声信号分配器8に接続され
たスピーカ9、遠隔制御装置10に接続された遠隔側(
和信号分配装置11が設けられている。[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1st
In the figure, 1 is the studio side and 2 is the classroom side. On the studio side, there is a microphone 3, an audio signal synthesizer 4 connected to the microphone 3, an audio signal distributor 5 connected to the audio signal synthesizer 4, an audio signal distributor 6 connected to the microphone 3, and an audio A sound-car signal splitter 8 connected to a signal synthesizer 7, a speaker 9 connected to this audio signal splitter 8, a remote side connected to a remote control device 10 (
A sum signal distribution device 11 is provided.
また、教室側2には音声信号選択装置12に接続された
スピーカ13、音声信号合成器14に接続されたマイク
ロホン15が設けられている。Further, the classroom side 2 is provided with a speaker 13 connected to an audio signal selection device 12 and a microphone 15 connected to an audio signal synthesizer 14.
そして、上記スタジオ側1の音声信号分配器56と教室
側2の音声信号選択装置12間は、スタジオから教室向
けの2系統の音声信号伝送路16゜17で接続され、ス
タジオ側1の音声信号合成器7と教室側2の音声信号合
成器14間は、教室からスタジオ向けの1系統の音声信
号伝送路18で接続され、スタジオ側lの遠隔制御信号
分配装置11と教室側2の音声信号選択装置12間はl
系統の制御信号伝送路19で接続されている。The audio signal distributor 56 on the studio side 1 and the audio signal selection device 12 on the classroom side 2 are connected by two audio signal transmission lines 16 and 17 from the studio to the classroom. The synthesizer 7 and the audio signal synthesizer 14 on the classroom side 2 are connected by one audio signal transmission path 18 from the classroom to the studio, and the audio signal between the remote control signal distribution device 11 on the studio side l and the audio signal on the classroom side 2 is connected. Between the selection devices 12
They are connected via a system control signal transmission line 19.
次に上記実施例の動作について説明する。遠隔教育形態
においては、講議の際にはマイクロホン3の音声信号を
全教室のスピーカ13に送出するが、質疑応答の際には
、マイクロホン15の質問音声と、マイクロホン3の回
答音声とを全教室のスピーカ13に送出する必要がある
が、質問者の居る教室については、質問音声がエコーと
して聞えることになり、音響条件によっては鳴音となる
ため、回答音声のみをスピーカ13に送出する必要があ
る。Next, the operation of the above embodiment will be explained. In the distance education format, during a lecture, the audio signal from the microphone 3 is sent to the speakers 13 in all classrooms, but during a question-and-answer session, the question audio from the microphone 15 and the answer audio from the microphone 3 are transmitted to all the speakers 13 in all classrooms. It is necessary to send it to the speaker 13 in the classroom, but in the classroom where the questioner is present, the question voice will be heard as an echo, and depending on the acoustic conditions, it will become a ringing sound, so it is necessary to send only the answer voice to the speaker 13. There is.
このため、マイクロホン3の回答音声は、音声信号分配
器6から音声信号伝送路17を経由して、全教室向けに
送出すると同時に、教室のマイクロホン15から音声信
号合成器14、音声信号伝送路18、音声信号合成器7
、音声信号分配器8を経由して得られた質問音声とマイ
クロホン3の回答音声とを音声信号合成器4により合成
し、音声信号分配器5、音声信号伝送路16を経由して
全教室向けに送出すると共に、遠隔制御装置10より遠
隔制御信号分配装置11、制御信号伝送路19を経由し
て音声信号選択装置12を操作して、質問者の居る教室
については音声信号伝送路17よりの回答音声信号をス
ピーカ13に送出し、他の教室については、音声信号伝
送路16よりの質問音声と回答音声との合成信号をスピ
ーカ9に送信することにより、質問者の居る教室におけ
るエコー及び鳴音の防止と、他の教室における質疑応答
状況の聴取を実現する。Therefore, the answer voice from the microphone 3 is transmitted from the voice signal distributor 6 to the voice signal transmission line 17 to all the classrooms, and at the same time from the microphone 15 in the classroom to the voice signal synthesizer 14 and the voice signal transmission line 18. , audio signal synthesizer 7
, the question voice obtained via the voice signal distributor 8 and the response voice from the microphone 3 are synthesized by the voice signal synthesizer 4, and then transmitted to all classrooms via the voice signal divider 5 and the voice signal transmission line 16. At the same time, the remote control device 10 operates the audio signal selection device 12 via the remote control signal distribution device 11 and the control signal transmission path 19, and the classroom where the questioner is located is transmitted from the audio signal transmission path 17. The answer audio signal is sent to the speaker 13, and for other classrooms, a composite signal of the question audio and answer audio from the audio signal transmission line 16 is sent to the speaker 9, thereby eliminating echoes and ringing in the classroom where the questioner is present. Prevents noise and enables listening to question-and-answer situations in other classrooms.
なお、上記実施例では遠隔制御装置10より遠隔制御信
号分配装置11を介して音声信号選択装置12を操作し
て、音声信号伝送路16、音声信号伝送路17のいずれ
かよりの音声信号をスピーカ13に送出することを示し
たが、音声信号選択装置12に音声信号合成器14の出
力と音声信号伝送路18とを追加接続し、遠隔制御装置
10、遠隔制御信号分配袋[11より音声信号選択装置
12を操作して、音声信号伝送路16からの音声信号を
スピーカ13に送出する際には、音声信号合成器14か
らの音声信号は音声信号伝送路18には送出せず、音声
信号伝送路17からの音声信号をスピーカ13に送出す
る際には、音声信号合成器14からの音声信号は音声信
号伝送路18に送出するように連動をさせてもよい。In the above embodiment, the remote control device 10 operates the audio signal selection device 12 via the remote control signal distribution device 11 to select the audio signal from either the audio signal transmission path 16 or the audio signal transmission path 17 to the speaker. 13, the output of the audio signal synthesizer 14 and the audio signal transmission line 18 are additionally connected to the audio signal selection device 12, and the audio signal is transmitted from the remote control device 10 and the remote control signal distribution bag [11]. When operating the selection device 12 to send the audio signal from the audio signal transmission path 16 to the speaker 13, the audio signal from the audio signal synthesizer 14 is not sent to the audio signal transmission path 18, and the audio signal is When the audio signal from the transmission path 17 is sent to the speaker 13, the audio signal from the audio signal synthesizer 14 may be linked to be sent to the audio signal transmission path 18.
以上のように、この発明によれば、スタジオのマイクロ
ホンでの音声信号、及びこの音声信号に教室からスタジ
オに伝送される音声信号を合成した音声信号を、スタジ
オから教室に向けての音声伝送路を用いて伝送するとと
もに、スタジオのマイクロホンでの音声信号のみを、上
記音声伝送路とは別の音声伝送路を用いて伝送し、教室
においては上記伝送された2種類の音声信号をスタジオ
からの遠隔制御信号により選択するように構成したので
、相手側からの音声信号を停止させることなく、エコー
を抑止できるエコー防止効果の高いエコー防止装置を簡
単がっ安価な装置構成で得られる効果がある。As described above, according to the present invention, an audio signal from a microphone in the studio and an audio signal obtained by combining this audio signal with an audio signal transmitted from the classroom to the studio are transmitted through the audio transmission path from the studio to the classroom. At the same time, only the audio signal from the microphone in the studio is transmitted using an audio transmission path different from the audio transmission path mentioned above, and in the classroom, the two types of audio signals transmitted above are transmitted from the studio. Since the selection is made using a remote control signal, it is possible to obtain an echo prevention device with a simple and inexpensive device configuration that is highly effective in preventing echoes and can suppress echoes without stopping the audio signal from the other party. .
図面はこの発明の一実施例によるエコー防止装置を示す
ブロック図である。
1はスタジオ側、2は教室側、3,15はマイクロホン
、9.13はスピーカ、4,7.14は音声信号合成器
、5,6.8は音声信号分配器、12は音声信号選択装
置、10は遠隔制御装置、11は遠隔制御11信号分配
装置、16.17はスタジオから教室向けの音声信号伝
送路、18は教室からスタジオ向けの音声信号伝送路、
19は遠隔制御信号伝送路。
なお、図中、同一符号は同一または相当部分を示す。The drawing is a block diagram showing an echo prevention device according to an embodiment of the present invention. 1 is the studio side, 2 is the classroom side, 3 and 15 are microphones, 9.13 are speakers, 4, 7.14 are audio signal synthesizers, 5 and 6.8 are audio signal distributors, and 12 is an audio signal selection device , 10 is a remote control device, 11 is a remote control 11 signal distribution device, 16.17 is an audio signal transmission path from the studio to the classroom, 18 is an audio signal transmission path from the classroom to the studio,
19 is a remote control signal transmission line. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
数のマイクロホンとスピーカとが設置された複数の教室
と、前記教室のマイクロホンへの音声信号を前記スタジ
オへ伝送する第1の音声信号伝送路と、前記スタジオの
マイクロホンへの音声信号を前記教室へ伝送する第2の
音声信号伝送路と、前記スタジオのマイクロホンへの音
声信号に該スタジオへ伝えられた前記教室のマイクロホ
ンへの音声信号を混合して該教室へ伝送する第3の音声
信号伝送路と、前記第2の音声信号伝送路により伝送さ
れた音声信号か前記第3の音声信号伝送路により伝送さ
れた音声信号かを選択するように前記教室に設けられた
音声信号選択装置と、前記スタジオに設けられた遠隔制
御装置からの遠隔制御信号を前記音声信号選択装置へ伝
送して該音声信号選択装置を遠隔制御する制御信号伝送
路とを備えたエコー防止装置。a studio in which a microphone and a speaker are installed; a plurality of classrooms in which a plurality of microphones and speakers are installed; a first audio signal transmission path for transmitting an audio signal to the microphone in the classroom to the studio; and the studio. a second audio signal transmission line for transmitting an audio signal to the microphone in the classroom to the classroom; a third audio signal transmission path to be transmitted to the classroom; and a third audio signal transmission path for transmitting the audio signal to the classroom; an audio signal selection device provided in the studio; and a control signal transmission path for transmitting a remote control signal from a remote control device provided in the studio to the audio signal selection device to remotely control the audio signal selection device. Anti-echo device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2122311A JPH0418899A (en) | 1990-05-11 | 1990-05-11 | Echo preventing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2122311A JPH0418899A (en) | 1990-05-11 | 1990-05-11 | Echo preventing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0418899A true JPH0418899A (en) | 1992-01-23 |
Family
ID=14832819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2122311A Pending JPH0418899A (en) | 1990-05-11 | 1990-05-11 | Echo preventing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0418899A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008070481A (en) * | 2006-09-12 | 2008-03-27 | Yazaki Corp | Instrument apparatus and sound apparatus |
-
1990
- 1990-05-11 JP JP2122311A patent/JPH0418899A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008070481A (en) * | 2006-09-12 | 2008-03-27 | Yazaki Corp | Instrument apparatus and sound apparatus |
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