JPS60204158A - Conference telephone system - Google Patents
Conference telephone systemInfo
- Publication number
- JPS60204158A JPS60204158A JP5947384A JP5947384A JPS60204158A JP S60204158 A JPS60204158 A JP S60204158A JP 5947384 A JP5947384 A JP 5947384A JP 5947384 A JP5947384 A JP 5947384A JP S60204158 A JPS60204158 A JP S60204158A
- Authority
- JP
- Japan
- Prior art keywords
- subscribers
- subscriber
- signal
- voice
- circuit
- 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.)
- Granted
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】
（発明の属する分野）
本発明は、会議電話の加算分配制御を行う会議電話方式
に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a conference telephone system that performs addition and distribution control for conference calls.
（従来の技術）
会議電話は遠隔地にいる１人の加入者に対し、自チャン
ネルの音声信号を除いた他のチャンネルの音声信号を加
算合成してえられる音声和信号を、伝送回線を介して各
加入者のチャンネルの受信部へ分配することにより実現
される。(Prior art) A conference telephone transmits to one subscriber in a remote location an audio sum signal obtained by adding and synthesizing audio signals of other channels excluding the audio signal of the own channel via a transmission line. This is realized by distributing the information to the receiving section of each subscriber's channel.
この場合、自チャンネルを除く他のチャンネルの音声信
号を単に加算するのみでは、例えば全チャンネルが無音
声となった時、各チャンネルで受聴する無通話時の雑音
レベルはおおよそ６倍の雑音を受聴することとなり、こ
れは伝送回線に要求されている一定水準以上の伝送品質
を満たしているとは言い難い。In this case, if you simply add the audio signals of other channels except your own channel, for example, when all channels are silent, the noise level heard on each channel during no calls will be approximately 6 times higher. Therefore, it is difficult to say that this satisfies the transmission quality above a certain level required for transmission lines.
第１図は受信者数（ｎ）に対するＡＢＮ （伝送品質基
準の単音明瞭度）劣化量（ａｎ ）の関係を示すもので
、図中、２Ｗ−４Ｗｉ１：ＴＣ階梯２線式交換機対４線
式交換機、４Ｗ−４ＷはＴＣ階梯４綜式交換機幻４線式
交換機の特性をそれぞれ示している。Figure 1 shows the relationship between the number of receivers (n) and the amount of ABN (transmission quality standard single tone intelligibility) deterioration (an). The switch 4W-4W indicates the characteristics of a TC ladder four-wire switch and a phantom four-wire switch, respectively.
例えば、現在の公衆回線を用いて会議電話を実施すると
第１図に示すように加入者が５Å以上になると伝送品質
基準の単音明瞭度（ＡＥＮ）劣化量４９ｄＢ以」二とな
り、通常の通話品質の基準を超え、好ましくないことが
わかる。For example, when a conference call is carried out using current public telephone lines, as shown in Figure 1, if the subscriber is over 5 Å, the deterioration of the single tone intelligibility (AEN) of the transmission quality standard is 49 dB or more, and the normal call quality is exceeds the standard and is found to be undesirable.
（発明の目的）
本発明は、これらの欠点を除去するため、通常の電話と
同程度の通話品質を確保できる会議電話加算分配制御方
式を提供することにある。(Object of the Invention) In order to eliminate these drawbacks, it is an object of the present invention to provide a conference call addition and distribution control system that can ensure call quality comparable to that of a normal telephone.
（発明の構成および作用）
第２図は本発明の一実施例の構成を示すブロック図で、
１−１〜１−ｎは音声入力信号端子、２−１〜２−ｎは
遅延回路、３−１〜３−ｎは音声検出回路、４−１〜４
−ｎは音声検出回路３−１〜３−ｎの出１カ信号、５は
全加入者無通話検出回路、６は全加入者無通話検出回路
５の出力信号、７は雑音制御回路、８は雑音制御回路７
の出力信号、９は加算分配回路、１０−＋〜１０−ｎは
音声出力信号端子、１１は全加入者数の人力信号、１２
−１〜１２−ｎは遅延回路２−＋〜２−ｎの出力信号で
ある。(Structure and operation of the invention) FIG. 2 is a block diagram showing the structure of an embodiment of the invention.
1-1 to 1-n are audio input signal terminals, 2-1 to 2-n are delay circuits, 3-1 to 3-n are audio detection circuits, 4-1 to 4
-n is the output signal of the voice detection circuits 3-1 to 3-n, 5 is the all subscriber no call detection circuit, 6 is the output signal of the all subscriber no call detection circuit 5, 7 is the noise control circuit, 8 is noise control circuit 7
9 is an addition/distribution circuit, 10-+ to 10-n are audio output signal terminals, 11 is a human input signal of the total number of subscribers, 12
-1 to 12-n are output signals of delay circuits 2-+ to 2-n.
以下、図面に沿って本発明の内容を述べる。Hereinafter, the content of the present invention will be described along with the drawings.
各加入者からのアナログ音声信号をディジタル信号に変
換した音声信号は音声入力信号端子１−１〜１−ｎより
入力され、話頭切断、話尾切断を防止するため、音声検
出に要する時間分だけ音声信号を遅延回路２−１〜２−
ｎによって遅延させる。また音声入力信号端子１−１〜
ｔ−ｎからの音声信号は該音声信号 ° ：”“′−°
の有無を検出するだめの音声検出回路３−１〜３−ｎに
入力される。The audio signal obtained by converting the analog audio signal from each subscriber into a digital signal is input from the audio input signal terminals 1-1 to 1-n, and in order to prevent the beginning and end of the speech from being cut off, the audio signal is input only for the time required for audio detection. Audio signal delay circuits 2-1 to 2-
Delay by n. Also, audio input signal terminal 1-1~
The audio signal from t-n is the audio signal °:""'-°
The signal is input to voice detection circuits 3-1 to 3-n for detecting the presence or absence of the signal.
次に音声検出回路３−１〜３−ｎの出力信号４−１〜４
−ｎにより、会議に参加している加入者の内、全加入者
の無通話状態を全加入者無通話検出回路５で検出する。Next, the output signals 4-1 to 4 of the voice detection circuits 3-1 to 3-n
-n, the all-subscriber no-call detection circuit 5 detects the no-call state of all subscribers among the subscribers participating in the conference.
全加入者無通話回路５はすべての入力信号の論理６０″
の時、出力信号の論理１１″を出力するＮＯＲゲート回
路で実現できることは明白である。The all-subscriber non-call circuit 5 has a logic 60'' of all input signals.
It is clear that this can be realized by a NOR gate circuit that outputs a logic 11'' output signal.
雑音制御回路７では、全加入者の無通話状態を検出した
全加入者無通話検出回路５の出力６と全加入者数の入力
信号１１により、例えば予め加入者数に対する減衰量の
内容を収容しているＲＯＭテーブルによって減衰すべき
雑音制御回路出力信号８を出力する。In the noise control circuit 7, for example, the content of the attenuation amount for the number of subscribers is stored in advance using the output 6 of the all-subscriber no-call detection circuit 5 that detects the no-call state of all subscribers and the input signal 11 of the total number of subscribers. The noise control circuit output signal 8 is output to be attenuated by the ROM table.
ＲＯＭテーブルの内容は、例えば第１図に示すように無
通話時の総合雑音電力が各チャンネルの無通話暗雑音電
力の６倍に比例すること、全加入者数が設定されること
から、その加入者数をＲＯＭのアドレス信号入力としそ
のアドレス信号の１２４９倍の出力信号を発生するもの
であればよい。The contents of the ROM table are, for example, as shown in Figure 1, since the total noise power during no calls is proportional to six times the no-call background noise power of each channel, and the total number of subscribers is set. Any device may be used as long as it inputs the number of subscribers as an address signal of the ROM and generates an output signal 1249 times as large as the address signal.
一方、遅延回路２−１〜２−ｎがらの出力信号１２−１
〜１２−ｎ、音声検出回路３−１〜３−ｎからの出力信
号４−＋〜４−ｎおよび雑音制御回路７の出方信号８等
は加算分配回路９に入力される。On the other hand, output signals 12-1 from delay circuits 2-1 to 2-n
12-n, the output signals 4-+ to 4-n from the voice detection circuits 3-1 to 3-n, the output signal 8 of the noise control circuit 7, and the like are input to the addition/distribution circuit 9.
第３図は第２図における加算分配回路９の詳細な構成を
示す一実施例であり、１３−、〜１３−ｎ は乗算回路
、１４はセレクタ、１５は加算回路、１６−１〜１６−
ｎは減算回路を示し、その他の符号は第２図で示したも
のと同じである。FIG. 3 shows an embodiment showing a detailed configuration of the addition/distribution circuit 9 in FIG.
n indicates a subtraction circuit, and the other symbols are the same as those shown in FIG.
これは、雑音制御回路７から出力された各加入者の音声
信号を加算分配回路９に入力するものであり、音声検出
回路３−１〜３−ｎからの出力信号４−＋〜４−ｎによ
り、音声信号として検出できた時（有音状態）、遅延回
路２−１〜２−ｎがらの有音状態の音声信号をセレクタ
１４により選択する。全加入者無通話時、乗算回路１３
−１〜１３〜ｎで遅延回路２−＋〜２−ｎがらの無音状
態の出力信号１２−１〜１２−ｎと靴音制御回路７の出
力信号８との乗算を行い、その乗算出力をセレクタ１４
で全加入者無通話検出回路出方信号６により選択する。This inputs the voice signals of each subscriber output from the noise control circuit 7 to the addition/distribution circuit 9, and output signals 4-+ to 4-n from the voice detection circuits 3-1 to 3-n. When the audio signal can be detected as an audio signal (in a sound state), the selector 14 selects the audio signal in the sound state from the delay circuits 2-1 to 2-n. When all subscribers are not calling, multiplier circuit 13
-1 to 13 to n multiply the silent output signals 12-1 to 12-n from the delay circuits 2-+ to 2-n by the output signal 8 of the shoe sound control circuit 7, and the multiplied output is sent to the selector. 14
The selection is made by the all-subscriber non-call detection circuit output signal 6.
セレクタ１４によって選択された各加入者の出力信号は
一旦、加算回路１５で加算され、減算回路１６−１〜１
６−ｎで加算きれた音声和信号から各チャンネルの音声
信号を減算する。減算された出力信号は加算分配回路９
の出力信号として音声出力信号端子１０−１〜１０−ｎ
から出力される。The output signals of each subscriber selected by the selector 14 are once added in an adding circuit 15, and then sent to subtracting circuits 16-1 to 16-1.
The audio signal of each channel is subtracted from the audio sum signal that has been added in step 6-n. The subtracted output signal is sent to the addition/distribution circuit 9
Audio output signal terminals 10-1 to 10-n are used as output signals of
is output from.
第４図は第２図における加算分配回路９の詳細な構成を
示す他の実施例であり、全加入者の無音状態の信号レベ
ルを減衰きせる乗算回路を前記減算回路１６−１〜１６
−ｎの出力信号で行う例を示している。なお、図中１７
はゲート回路である。FIG. 4 is another embodiment showing the detailed configuration of the addition/distribution circuit 9 in FIG.
An example is shown in which the output signal is -n. In addition, 17 in the figure
is a gate circuit.
音声検出回路３−１〜３−ｎがらの出力信号４−１〜４
−ｎにより１音声信号として検出できだ時（有音状態）
、遅延回路２−＋〜２−ｎからの有音状態の音声信号を
ゲート回路１７により選択する。ここで、ゲート回路１
７は全加入者無通話検出回路出力６と音声検出出力４と
のＥｘｃｌｕｓ ｉｖｅ ＯＲで実現可能である。ゲー
ト回路１７の出力信号は加算回路１５と減算回路１６−
１〜１６−ｎにより信号加算分配され、セレクタ回路１
４で全加入者無通話時の信号レベルを抑圧した乗算回路
１３−１〜１３−ｎの出力信号と加入者音声出力信号を
全１０−１〜１（ＩＪ＼ら出力される。Output signals 4-1 to 4 from the voice detection circuits 3-1 to 3-n
- When it can be detected as one audio signal by n (sound state)
, the gate circuit 17 selects the sound signals from the delay circuits 2-+ to 2-n. Here, gate circuit 1
7 can be realized by exclusive ORing the all-subscriber no-call detection circuit output 6 and the voice detection output 4. The output signal of the gate circuit 17 is sent to the addition circuit 15 and the subtraction circuit 16-.
The signals are added and distributed by 1 to 16-n, and the selector circuit 1
The output signals of the multiplier circuits 13-1 to 13-n and the subscriber voice output signals whose signal levels are suppressed when all the subscribers are not talking in step 4 are outputted from all 10-1 to 10-1 (IJ\, etc.).
（効 果）
以上説明したように本発明は、会議に参加している加入
者の内、音声信号として検出できた時は加算し）全加入
者が音声信号として検出できなかった時は全加入者数に
比例した減衰量を無通話の信号レベルに与えることにな
っているので、全加入者が無通話の場合でも信号が途切
れることなく会議室の背景雑音を受聴されることになる
。従って、従来のように自チャンネルを除く他のチャン
ネルの音声信号を加算する方法では全加入者無通話時の
雑音レベルがおおよそ１チヤンネルのｎ倍であったもの
が本発明では１チヤンイルと等価となるから雑音量を軽
減する利点があり、不快を感じない自然の会議の雰囲気
となる利点がある。(Effects) As explained above, the present invention adds up all subscribers participating in a conference when it can be detected as an audio signal; Since an amount of attenuation proportional to the number of subscribers is given to the signal level when no calls are made, the background noise in the conference room can be heard without interruption of the signal even when all the subscribers are not talking. Therefore, in the conventional method of adding the audio signals of other channels excluding the own channel, the noise level when all subscribers are not talking is approximately n times that of one channel, but with the present invention, it is equivalent to one channel. This has the advantage of reducing the amount of noise and creating a natural meeting atmosphere that does not cause discomfort.
第１図は受信者数に対するＡＥＮ劣化量の関係を示す図
、第２図は本発明の一実施例の構成を示すブロック図、
第３図および第４図はいずれも第２図における加算分配
回路の詳細な構成を示す実施例である。
１−１〜ｉ−ｎ・・・・・・・・音声入力信号端子、２
−１〜２−ｎ・・・・・・・・・遅延回路、３−１〜３
−ｎ・・・・・・・・・音声検出回路、４−１〜４−ｎ
・・・・・・・音声検出回路３−１〜３−ｎの出力信号
、 ５・・−・・・・・全加入者無通話検出回路、 ６
・・・・・・・・・全加入者無通話検出回路５の出力信
号、 ７・・・・・・・・雑音制御回路、 ８・・・・
・・・・雑音制御回路７の出力信号、 ９ ・・・・・
・・・・加算分配回路、１０−１〜１０−ｎ・・・・・
・・・・音声出力信号端子、１１・・・・・・・全加入
者数の入力信号、１２−１〜１２−ｎ ・・・・・・・
・遅延回路２−１〜２−ｎの出力信号、１３−１〜１３
−ｎ・・・・・・・・・乗算回路、１４・・・・・・・
セレクタ回路、１５・・・・・・・・加算回路、１６
−１〜１６−ｎ・・・・・・・・減算回路、１７・・・
・叩・ゲート回路。
第１図
第２図
第３図
２：ＩｔｕｓFIG. 1 is a diagram showing the relationship between the amount of AEN deterioration and the number of recipients, and FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.
Both FIG. 3 and FIG. 4 are examples showing detailed configurations of the addition/distribution circuit in FIG. 2. 1-1~i-n...Audio input signal terminal, 2
-1~2-n...Delay circuit, 3-1~3
-n......Audio detection circuit, 4-1 to 4-n
. . . Output signals of voice detection circuits 3-1 to 3-n, 5 . . . All subscriber non-call detection circuit, 6
......Output signal of all subscriber no-call detection circuit 5, 7...Noise control circuit, 8...
...Output signal of noise control circuit 7, 9 ...
...addition distribution circuit, 10-1 to 10-n...
...Audio output signal terminal, 11....Input signal of total number of subscribers, 12-1 to 12-n...
・Output signals of delay circuits 2-1 to 2-n, 13-1 to 13
-n・・・・・・Multiplication circuit, 14・・・・・・
Selector circuit, 15...Addition circuit, 16
-1 to 16-n... Subtraction circuit, 17...
- Hit/gate circuit. Figure 1 Figure 2 Figure 3 Figure 2: Itus
Claims (1)
うにした会議電話方式において、各加入者の音声信号の
有無を検出する音声検出手段と、前記音声検出手段によ
り会議を構成している全加入者の無音状態を検出する全
加入者無通話検出手段と、その全加入者無通話検出手段
により全加入者の音声信号が無音状態であった時、その
無音状態の信号レベルを全加入者顛比例した量で減衰さ
せ、且つ前記音声検出手段により少なくとも一人以」二
の加入者の音声信号として検出できた時、その加入者の
音声信号だけをそのまま音声信号レベルで通過しそれ以
外の無音状態にある加入者の信号レベルを阻止する雑音
制御手段と、その雑音制御手段により出力された各加入
者の音声信号から自加入者以外の音声信号の和信号を作
成し各加入者に分配する加算分配手段とを有することを
特徴とする会議電話方式。 （２１全加入者無通話検出手段により全加入者の音声信
号が無音状態であった時、全加入者の無音状態の信号レ
ベルを加算分配手段に入力し、その加算分配手段の出力
の信号レベルを全加入者に比例した量で減衰させる雑音
制御手段を有すること。 を特徴とする特許請求範囲第（１）項記載の会議電話方
式。 （３） 全加入者無通話検出時、前記全加入者の無音状
態の信号レベルをＩＡへ（ｎ：全加入者数）で減衰させ
る雑音制御手段を有することを特徴とする特許請求範囲
第（１）項記載の会議電話方式。[Scope of Claims] (1) In a conference telephone system that allows simultaneous calls between three or more subscribers, there is provided a voice detection means for detecting the presence or absence of a voice signal from each subscriber; an all-subscriber no-call detecting means for detecting a silent state of all subscribers constituting a conference; When the signal level of a silent state is attenuated by an amount proportional to all subscribers, and the voice detection means can detect the voice signal of at least one subscriber, only the voice signal of that subscriber is directly converted into voice. Noise control means that passes through the signal level and blocks the signal level of other subscribers in a silent state, and a sum signal of the voice signals of each subscriber other than the own subscriber from the voice signals of each subscriber outputted by the noise control means. and an addition distribution means for creating and distributing to each subscriber. (21) When the voice signals of all subscribers are in a silent state as determined by the non-call detection means for all subscribers, the signal level of the silent state of all subscribers is input to the addition and distribution means, and the signal level of the output of the addition and distribution means is The conference telephone system according to claim (1) is characterized in that it has a noise control means that attenuates the noise by an amount proportional to all the subscribers. The conference telephone system according to claim 1, further comprising noise control means for attenuating the signal level of a silent state of a person to an IA by (n: the total number of subscribers).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5947384A JPS60204158A (en) | 1984-03-29 | 1984-03-29 | Conference telephone system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5947384A JPS60204158A (en) | 1984-03-29 | 1984-03-29 | Conference telephone system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60204158A true JPS60204158A (en) | 1985-10-15 |
| JPH034148B2 JPH034148B2 (en) | 1991-01-22 |
Family
ID=13114310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5947384A Granted JPS60204158A (en) | 1984-03-29 | 1984-03-29 | Conference telephone system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60204158A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04851A (en) * | 1990-04-04 | 1992-01-06 | Mitsubishi Electric Corp | Audio conference device |
| WO2011018362A1 (en) | 2009-08-14 | 2011-02-17 | Skype Limited | Controlling multi-party communications |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5871759A (en) * | 1981-10-26 | 1983-04-28 | Nec Corp | Digital conference trunk |
| JPS58150357A (en) * | 1981-12-10 | 1983-09-07 | アルカテル・エヌ・ブイ | Conference telephone setting method and circuit device |
-
1984
- 1984-03-29 JP JP5947384A patent/JPS60204158A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5871759A (en) * | 1981-10-26 | 1983-04-28 | Nec Corp | Digital conference trunk |
| JPS58150357A (en) * | 1981-12-10 | 1983-09-07 | アルカテル・エヌ・ブイ | Conference telephone setting method and circuit device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04851A (en) * | 1990-04-04 | 1992-01-06 | Mitsubishi Electric Corp | Audio conference device |
| WO2011018362A1 (en) | 2009-08-14 | 2011-02-17 | Skype Limited | Controlling multi-party communications |
| US9449614B2 (en) | 2009-08-14 | 2016-09-20 | Skype | Controlling multi-party communications |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH034148B2 (en) | 1991-01-22 |
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