JPS603255A - Conference talking circuit - Google Patents
Conference talking circuitInfo
- Publication number
- JPS603255A JPS603255A JP11135283A JP11135283A JPS603255A JP S603255 A JPS603255 A JP S603255A JP 11135283 A JP11135283 A JP 11135283A JP 11135283 A JP11135283 A JP 11135283A JP S603255 A JPS603255 A JP S603255A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- signal level
- detecting
- subscriber
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は通信用交換回路網を介して会議を行う会議通話
回路に関し、特に会議参加者が多い場合の会議通話回路
に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a conference call circuit for holding a conference via a communication switched circuit network, and particularly to a conference call circuit when there are many participants in the conference.
会議通話回路において聴感土量も自然な方式はＮ−１加
算力式であるとされている。これはＮ者の会議において
各加入者に自分以外のＮ−１者の入力音声の和を出力と
して返す方式である。ところで、Ｎ−１加算力式の会議
通話回路においても、鳴音条件を満たすために減衰回路
を設けていた。In a conference call circuit, the N-1 addition power method is considered to be the method that provides a natural auditory volume. This is a method in which the sum of the input voices of N-1 parties other than the subscriber is returned as output to each subscriber in a conference of N participants. Incidentally, even in the N-1 addition power type conference call circuit, an attenuation circuit is provided in order to satisfy the sounding condition.
ここで鳴音条件とは、入力音声が所定の信号伝送回路お
よび別の加入者の入力音声信号線・出力音声信号間の漏
話等を通じて自己の出力音声信号線に戻り、それが漏話
のためまた自己の入力音声信分線に入力することにより
ループを形成するが、そのループ料量が１以下の条件を
いい、この条件下では発振しない。しかし、従来の回路
は最悪条件を想定して、たんに通話者の入力音声を一律
に減衰するものであったため、不必要に減衰しており、
音声が小さく不便な場合があった。Here, the sound condition means that input audio returns to its own output audio signal line through a predetermined signal transmission circuit and crosstalk between another subscriber's input audio signal line and output audio signal, and A loop is formed by inputting to its own input audio signal branch line, but the loop charge is 1 or less, and under this condition, no oscillation occurs. However, conventional circuits assume the worst-case scenario and simply attenuate the input voice of the caller, resulting in unnecessary attenuation.
There were times when the sound was low and inconvenient.
本発明は上記欠点に鑑み提案されたものであり、鳴音条
件を満足させ、かつ通話者の音声の減衰の少ない会議通
話回路の提供を目的とする。The present invention has been proposed in view of the above-mentioned drawbacks, and an object of the present invention is to provide a conference call circuit that satisfies the sounding conditions and reduces the attenuation of the voices of callers.
本発明は、各加入者からの入力音声信号の信号レベルを
検出する手段と、前記入力音声信号の信号レベルを減衰
させる可変減衰手段と、前記可変減衰手段の出力を全加
入者について加算する手段と、前記加９手段の出力から
前記可変減衰手段の出力を減算しその結果を各加入者へ
出力する減算手段と、前記加算手段の出力信号レベルを
検出する手段と、前記入力音声信号レベル検出手段の出
力と前記加算手段出力信号レベル検出手段の出力とを比
較する比較手段により構成されている。The present invention provides means for detecting the signal level of an input audio signal from each subscriber, variable attenuation means for attenuating the signal level of the input audio signal, and means for adding up the output of the variable attenuation means for all subscribers. and subtracting means for subtracting the output of the variable attenuation means from the output of the adding means and outputting the result to each subscriber, means for detecting the output signal level of the adding means, and detecting the input audio signal level. It is comprised of comparison means for comparing the output of the means and the output of the addition means output signal level detection means.
図面を参照しながら本発明の実施例に係る会議通話回路
の構成について説明する。第１図は本発明の実施例に係
る会議通話回路の４１Ｑ成を示すブロック図である。１
０は各加入者の入力音声信号レベルを検出する入力音声
パワー検出回路、１１は後述のＮ者音声パワー検出回路
２の出力と入力音声パワー検出回路ｌＯとの出力を比較
するパワー比較回路、１２はパワー比較回路の出力信号
に応じて入力音声信号レベルを減衰する可変減衰回路、
１は各加入者ごとの可変減衰回路１２から出力された信
号をすべて加算する加算器である。The configuration of a conference call circuit according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a 41Q configuration of a conference call circuit according to an embodiment of the present invention. 1
0 is an input audio power detection circuit that detects the input audio signal level of each subscriber; 11 is a power comparison circuit that compares the output of the N-party audio power detection circuit 2 and the output of the input audio power detection circuit IO, which will be described later; 12 is a variable attenuation circuit that attenuates the input audio signal level according to the output signal of the power comparison circuit;
Reference numeral 1 denotes an adder that adds all the signals output from the variable attenuation circuit 12 for each subscriber.
また、２は加算器１から出力され信号レベルを検出する
Ｎ者音声パワー検出回路、１３は加算器ｌの出力信号と
自己の可変減衰回路１２の出力信号を入力し、加算器１
の出力信号から自己の可変減衰回路１２の出力信号を減
算して出力する減算回路である。１００は入力音声信号
線、１０１は出力音声信号線である。2 is an N-person audio power detection circuit that detects the signal level output from the adder 1;
This is a subtraction circuit that subtracts the output signal of its own variable attenuation circuit 12 from the output signal of the variable attenuation circuit 12 and outputs the result. 100 is an input audio signal line, and 101 is an output audio signal line.
次に図面を参照しながら本発明の実施例に係る会；モ゛
ミ通話回路のＩｉｊノＨ作について説明する。入力音声
の回路網を通じて他人の出力音声信号線１０１から出力
される。これらの出力音声信号は漏話により、それぞれ
の入力音声信号＋Ｖ、’Ｊ １００から再び入プル、加
算器１で加算される。加算結果は、はぼ漏話により生じ
た音声入力に等しい。加算器１のより生じた音声入力と
を比較シ、比較結果全出力する。Ｕ］変神３挾回路１２
はこの出力信号に応じて入力音声信号ｄ１００ｅ介して
入力する入力音声レベルを減衰制御する。Next, with reference to the drawings, the construction of a communication circuit according to an embodiment of the present invention will be described. It is output from the output audio signal line 101 of another person through the input audio circuit network. These output audio signals are input again from the respective input audio signals +V,'J 100 due to crosstalk and summed in adder 1. The summation result is equal to the voice input caused by the crosstalk. It compares the voice input generated by adder 1 and outputs all comparison results. U] Hengeshin 3-Hasaku Circuit 12
corresponds to this output signal to attenuate and control the input audio level input via the input audio signal d100e.
？かｊ話音声信号が、元の入力音声信号に比べて必要以
上に大きいとき可変減衰回路１３の減衰率を対応して大
きくすれば鳴音条件は守られるし、漏話音声信号が元の
入力音声信号に比べてさほど大きくないとき、減衰率を
小さくすれば、他の加入者への音声も小さくならない。? When the crosstalk audio signal is larger than necessary compared to the original input audio signal, if the attenuation rate of the variable attenuation circuit 13 is correspondingly increased, the sounding condition will be met, and the crosstalk audio signal will be the same as the original input audio signal. If the attenuation rate is reduced when the signal is not very loud compared to the signal, the sound to other subscribers will not be reduced.
以上説明したように、本発明は、鳴音条件を満足しなが
ら、かつ通話者の音声信号レベルに応じて減衰率を可変
できるので、聞きやすい会議通話が行えるという効果が
ある。また、回路の構成が比較的簡単であり、経済上も
、有利である。As described above, the present invention has the effect of making it possible to conduct conference calls that are easy to hear because the attenuation rate can be varied according to the voice signal level of the caller while satisfying the sounding conditions. Furthermore, the circuit configuration is relatively simple, which is advantageous from an economic point of view.
第１図は本発明の実施例に係る会議通話回路の構成を示
すブロック図である。FIG. 1 is a block diagram showing the configuration of a conference call circuit according to an embodiment of the present invention.
Claims (1)
段と、 ′ 前記入力音声信号の信号レベルを減衰させる可変減衰手
段と、 前記可変減衰手段の出力を全加入者について加算する手
段と、 前記加勢手段の出力から前記可変減衰手段の出力を減算
しその結果を各加入者へ出力する減算手段と、 前記加算手段の出力信号レベルを検出する手段と、 前記入力音声信号レベル検出手段の出力と前記加算手段
出力信号レベル検出手段の出力とを比較する比較手段と
からなり、 前記比較手段の出力により前記入力音声信号の信号レベ
ルを適宜減衰するように前記可変減衰手段を制御するこ
とを特徴とする会議通話回路。[Claims] Means for detecting the signal level of an input audio signal from each subscriber; variable attenuation means for attenuating the signal level of the input audio signal; and output of the variable attenuation means for all subscribers. means for adding; subtracting means for subtracting the output of the variable attenuation means from the output of the boosting means and outputting the result to each subscriber; means for detecting the output signal level of the adding means; and means for detecting the output signal level of the adding means; Comparing means for comparing the output of the level detecting means and the output of the adding means output signal level detecting means, and the variable attenuating means is configured to appropriately attenuate the signal level of the input audio signal by the output of the comparing means. A conference call circuit characterized by controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11135283A JPS603255A (en) | 1983-06-21 | 1983-06-21 | Conference talking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11135283A JPS603255A (en) | 1983-06-21 | 1983-06-21 | Conference talking circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS603255A true JPS603255A (en) | 1985-01-09 |
Family
ID=14559015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11135283A Pending JPS603255A (en) | 1983-06-21 | 1983-06-21 | Conference talking circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS603255A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01120948A (en) * | 1987-11-04 | 1989-05-12 | Nec Corp | Conference talking equipment |
| JPH03289253A (en) * | 1990-04-03 | 1991-12-19 | Iwatsu Electric Co Ltd | Telephone conference equipment |
-
1983
- 1983-06-21 JP JP11135283A patent/JPS603255A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01120948A (en) * | 1987-11-04 | 1989-05-12 | Nec Corp | Conference talking equipment |
| JPH03289253A (en) * | 1990-04-03 | 1991-12-19 | Iwatsu Electric Co Ltd | Telephone conference equipment |
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