JPH05167698A - Conference tele0phone set - Google Patents

Abstract

PURPOSE:To obtain a conference telephone set in which a conference talking by lots of conference participants is attained without causing oscillation and deterioration in the articulation. CONSTITUTION:A transmission function of a transmission signal representing the transmission state of a transmission voice signal is provided to each of telephone sets 11-15 or each of voice switches 81-85 used to detect a transmission voice signal during transmission and generating a transmission signal is connected to each of the telephone sets 11-15 and the telephone set is provided with a talker selection circuit 7 selecting the transmission voice signal from a telephone set from which the transmission signal is sent and inputting the selected signal to a mixer distribution circuit 4. Thus, the limitation of number of conference participants by the input terminal number of the mixer distribution circuit 4 is avoided, and even in the case of a conference into which a very huge number of participants take part, the conference talking is implemented without occurrence of oscillation and deterioration in the articulation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conference telephone device for making a conference call between a plurality of telephones.

[0002]

2. Description of the Related Art FIG. 4 shows, for example, "easy digital exchange" (edited by Shinichi Aizawa, Telecommunications Association of Japan, Showa 58).
It is a block diagram which shows the conventional conference telephone apparatus shown on pages 122-124 of the January issue). In the figure, 1 ₁
1 to ₃ are 4-wire telephones in which the transmitted voice and the received voice are separated, and 2 ₁ to 2 ₃ are transmission paths through which the transmitted voices transmitted from the respective telephones 1 ₁ to 1 ₃ are transmitted. , 3 ₁ to 3 ₃ are receiving paths received voice to be sent to each telephone 1 ₁ to 1 ₃ are transmitted. 4 mixes a transmitted voice for each phone 1 ₁ to 1 ₃ sent via the respective transmission paths 2 ₁ to 2 _3, mixed distribution circuit for distributing it to each reception path 3 _{1-3 3} Is.

Next, the operation will be described. Now, transmission voice if the conference call is taking place, which is transmitted from each of the telephone 1 ₁ to 1 ₃ in three phones 1 ₁ to 1 _3, via the transmission path 2 ₁ to 2 ₃ Is input to the mixing / distributing circuit 4. The mixing / distributing circuit 4 mixes the input voices sent from the _three telephones 1 ₁ to ₁ 3 and outputs the mixed voices to the receiving channels 3 _{1 to} 3 ₃ , respectively. As a result, the three telephones 1 ₁ to 1
In ₃ can hear the same received voice mixed with the transmitted voice from the telephone set 1 ₁ to 1 _3, it is possible to simultaneously conference call of 3's.

The general connection procedure in the exchange until the conference call is not directly related to the present invention, and the description thereof will be omitted.

[0005]

Since the conventional conference telephone device is constructed as described above, the number of participants in the conference is restricted by the number of input terminals of the mixing / distributing circuit 4, and this mixing is also difficult. If the number of input terminals of the distribution circuit 4 is too large, oscillation occurs or the intelligibility deteriorates. Therefore, the practical limit is about 8 terminals, and it becomes difficult for a large number of participants to make a conference call. There was a problem such as.

The present invention has been made in order to solve the above-mentioned problems, and is not limited by the number of input terminals of the mixing / distributing circuit, the number of oscillations and intelligibility can be improved by any number of conference participants. An object of the present invention is to obtain a conference telephone device capable of making a conference call without deterioration.

[0007]

According to another aspect of the present invention, there is provided a conference telephone device in which each telephone has a function of transmitting a transmission signal indicating that transmission voice is being transmitted.
A speaker selection circuit is provided for selecting a transmission voice from the telephone that transmitted the transmission signal and inputting it to the mixing and distributing circuit.

Further, the conference telephone device according to the invention described in claim 2 is prepared for each telephone, and detects the presence or absence of the voice transmission voice transmitted from the associated telephone and transmits the voice transmission signal. And a speaker selection circuit for selecting the voice to be transmitted from the telephone corresponding to the voice switch that has transmitted the voice signal and inputting it to the mixing and distributing circuit.

Further, the conference telephone device according to the invention of claim 3 is further provided with a 2-line to 4-line conversion circuit for each telephone.

[0010]

When the speaker selection circuit in the invention described in claim 1 receives the transmission signal indicating that the transmission voice transmitted from each telephone is being transmitted, the speaker selection circuit transmits the transmission signal from the telephone which transmitted the transmission signal. By selecting the speech voice and inputting it to the mixing / distributing circuit, it is possible to make a conference call without any oscillation or deterioration of the intelligibility, depending on the number of conference participants that is not limited by the number of input terminals of the mixing / distributing circuit. A conference telephone device is realized.

The voice switch according to the second aspect of the present invention detects the presence or absence of the transmission voice transmitted from the telephones associated with the respective voice switches and generates the transmission voice signal to generate the transmission voice signal. (EN) A conference telephone device capable of using a telephone having no function of transmitting a transmission signal indicating that transmission is in progress.

[0012] Further, in the second aspect of the invention,
The line-to-four-line conversion circuit sends a voice transmitted from a telephone to a voice transmission channel and transfers a voice received from the voice receiving channel to the telephone to provide a conference telephone device that can be used as a two-wire telephone. To be realized.

[0013]

EXAMPLES Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the invention described in claim 1. In FIG, 2 ₁ to 2 ₅
Transmission path, 3 ₁ to 3 ₅ reception path, 4 is a mixing and dispensing circuit, omitting the detailed description to avoid duplication with respect to conventional same as those or corresponding parts, denoted by the corresponding reference numerals in FIG. 4 To do. 5 _{1 to} 5 ₅ are provided with a transmission function of a transmission voice and a reception function of a reception voice, as well as a transmission function of a transmission signal indicating that a transmission voice is being transmitted, such as an ON signal by pressing a transmission button. 4 is a telephone different from the conventional one shown in FIG. 4, and 6 _{1 to} 6 ₅ are telephones 5 ₁ to 5 ₁
This is a transmission signal transmission path through which the transmission signal 5 ₅ is transmitted. 7 is a speaker selection circuit for inputting the mixed distribution circuit 4 selects the transmitted voice from the phone that sent the transmission signal to the transmission signal transmission line 6 _{through 65.}

Next, the operation will be described. A transmission signal according to the ON signal by pressing the talk button provided conference participants when speaking to your phone 5 ₁ (5 _5), and sends the transmission signal transmission line _{61 (through 65).} In the example shown,
The conference participants using the telephones 5 ₁ , 5 ₂ and 5 ₄ are speaking, and the transmission signals by the ON signals from the respective telephones 5 ₁ , 5 ₂ , 5 ₄ are transmitted by the transmission signal transmission lines 6 ₁ , 6 It is sent to the speaker selection circuit 7 via ₂ , 6 ₄ . As shown by the solid line in FIG. 1, the speaker selecting circuit 7 selects the transmission paths 2 ₁ , 2 ₂ and 2 ₄ based on the received transmission signal, and the telephones 5 ₁ ,
The transmitted voices transmitted by 5 ₂ and 5 ₄ are input to the three input terminals of the mixing / distributing circuit 4, respectively.

At this time, since the telephones 5 ₃ and 5 ₅ are not speaking and the send button is not pressed, the off signal of the send button is transmitted via the send signal transmission paths 6 ₃ and 6 _5. These telephones 5 ₃ and 5 ₅ are given to the speaker selection circuit 7.
The transmission paths 2 ₃ and 2 ₅ are not connected to the input terminals of the mixing / distributing circuit 4 as shown by the broken lines in FIG. Thus, mixing and dispensing circuit 4, telephone 5 _1, 5 ₂ and 5 ₄ transmission voice transmitted from the mixing, respectively distributes outputs it to the reception path 3 ₁ to 3 _5. As a result, five telephones 5 _1-
At 5 ₅ , the same received voice can be heard in which the transmitted voices from the telephones 5 ₁ , 5 ₂ , 5 ₄ are mixed.

The conference participant who finished speaking releases the pressing of the talk button to change the ON signal to the OFF signal. The speaker selection circuit 7 performs releasing the connection between the input terminal of the transmission path 2 ₁ mixed distribution circuit 4 of the telephone, for example, 5 ₁ and the appropriate receiving the OFF signal. The conference participant who newly speaks presses the talk button of his / her own telephone, for example, 5 ₅ , and sends a talk signal by an ON signal. When the speaker selection circuit 7 receives this ON signal, it connects the transmission path 2 ₅ of the corresponding telephone 5 ₅ to an empty input terminal of the mixing / distributing circuit 4. This allows each conference participant to take turns making a conference call.

When the number of conference participants who speak exceeds the number of input terminals of the mixing / distributing circuit 4, priority is given (for example, first-push priority), and the overflowing conference participants are transmitted. To limit. As a result, even if the number of telephones becomes the largest (for example, 100 or more), the transmission voice mixed in the mixing / distributing circuit 4 becomes only that of the three conference participants, causing oscillation or clearness. It is possible to make a conference call without deteriorating the degree.

In the above embodiment, the case where the number of input terminals of the mixing / distributing circuit 4 is 3 has been described. However, considering oscillation and deterioration of clarity, the number of input terminals up to about 8 is a practical range. .. It should be noted that if as many as eight people speak at the same time in an actual conference, the content of the conversation will not be understood, so it is meaningless to mix the voices transmitted by more conference participants, and the mixing and distributing circuit 4 If eight input terminals are prepared, there will be no substantial problem.

Example 2. In the first embodiment described above, the case where the transmission signal is transmitted from each telephone by a manual operation has been described, but the presence or absence of the transmission voice transmitted from each telephone is detected and the transmission signal is automatically transmitted. You may do it. FIG. 2 is a block diagram showing an embodiment of such an invention described in claim 2. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In the figure, ₁₁ to ₁₅
Is a telephone equivalent to the conventional one that does not have a transmission function of a transmission signal, and 8 ₁ to 8 ₅ are telephones 1 ₁ to 1 of these telephones.
₅ is prepared corresponding to each of the ₅ telephones, and the presence or absence of the transmission voice transmitted from the associated telephones 1 ₁ to ₁₅ to the respective transmission paths 2 ₁ to ₂₅ is detected to generate a transmission signal. , A voice switch for sending it to the transmission signal transmission lines 6 _{1 to} 6 ₅ .

Next, the operation will be described. When a conference participant speaks, the transmitted voice is his or her own telephone 1 ₁ (~ ₁₅ )
Is transmitted to the transmission path 2 ₁ (to 2 ₅ ). Each transmission channel 2 ₁
A voice switch 8 ₁ (to 8 ₅ ) is connected to (to 2 ₅ ), and each voice switch 8 ₁ (to 8 ₅ ) is a voice transmission to the connected transmission path 2 ₁ (to 2 ₅ ). When it is detected, the transmission signal by the ON signal is transmitted to the speaker selection circuit 7 through the transmission signal transmission line 6 ₁ (to 6 ₅ ) respectively, and the OFF signal is transmitted when it is not detected. The speaker selection circuit 7 controls connection switching between the transmission path 2 ₁ (to ₂₅ ) and the input terminal of the mixing / distributing circuit 4 based on the transmission signal. The mixing / distributing circuit 4 operates in the same manner as in the first embodiment, mixes the transmitted voices of the telephone sets 1 ₁ (to ₁₅ ) selected by the speaker selecting circuit 7 and receives the receiving channels 3 ₁ to.
It is distributed to 3 ₅ . 2 shows, when the telephone 1 _1, 1 ₂ of the conference participants is speaking are illustrated.

As a result, the telephone sets 1 ₁ to ₁₅ equivalent to the conventional ones, which do not have a function of transmitting a transmission signal such as a transmission button, are provided.
Can be used, and the transmission of the transmission signal can be automatically generated and transmitted by the voice switch without manually operating the transmission button or the like.

Embodiment 3. In each of the above-described embodiments, the case where the 4-wire system in which the transmitted voice and the received voice are separated is used as the telephone has been described. However, as shown in FIG. By connecting the circuits 9 _{1 to} 9 ₅ , it becomes possible to use the two-wire telephones 10 ₁ to 10 _{5 in} which the transmitted voice and the received voice are not separated. That is, the 2-wire to 4-wire conversion circuits 9 _{1 to} 9 ₅ are connected from the telephones 10 ₁ to 10 ₅ to the respective transmission / reception channels 11 _{1 to} 11 _5.
Sends a transmission voice that is output to the transmission path 2 ₁ to 2 _5, the reception channel 3 ₁ to 3 handset passage 11 a reception voice from _{5 1} to 11
_By transferring from ₅ to telephones 10 ₁ to 10 ₅ ,
It enables use of a two-wire type telephone having only the transmission / reception channels 11 _{1 to} 11 ₅ .

[0023]

As described above, according to the first aspect of the present invention, each telephone is provided with the function of transmitting the transmission signal indicating that the transmission voice is being transmitted, and the transmission signal is received. Since the person selecting circuit selects the transmission voice from the telephone that has transmitted the transmission signal and inputs it to the mixing and distributing circuit, any number of conference participants not restricted by the number of input terminals of the mixing and distributing circuit. Depending on the number, there is an effect that a conference telephone device capable of making a conference call without oscillation or deterioration of clarity is obtained.

According to the second aspect of the present invention, a voice switch is prepared for each telephone, and the presence or absence of the transmitted voice is transmitted from each associated telephone to detect the transmitted voice signal. Since the transmission of the transmission signal is further automated, it is possible to use a telephone having no transmission function of the transmission signal.

Further, according to the invention described in claim 3, since the two-wire to four-wire conversion circuit is connected to each telephone, there is an effect that a two-wire telephone can be used.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the present invention.

FIG. 4 is a block diagram showing a conventional conference call device.

[Explanation of symbols]

1 ₁ to ₁₅ telephone 4 mixed distribution circuit 5 _{1 to} 5 ₅ telephone 7 speaker selection circuit 8 ₁ to 8 ₅ voice switch 9 _{1 to} 9 ₅ 2-wire to 4-wire conversion circuit 10 ₁ to 10 ₅ telephone

Claims (3)

[Claims] 1. A conference telephone device for mixing transmitted voices sent from a plurality of telephones by a mixing / distributing circuit and distributing the mixed voices to the respective telephones. In addition to the receiving function of, the transmission voice signal indicating that the transmission voice is being transmitted is provided, and the transmission voice from the telephone that transmitted the transmission voice signal is selected and A conference telephone device comprising a speaker selecting circuit for inputting to the mixing and distributing circuit. 2. A conference telephone device that mixes transmitted voices sent from a plurality of telephones by a mixing / distributing circuit and distributes them to the respective telephones, the telephones being prepared corresponding to the respective telephones and corresponding to the telephones. A voice switch that detects the presence or absence of the transmitted voice and transmits a transmitted voice signal, and, when a transmitted voice signal is received from the voice switch, from the telephone corresponding to the voice switch that transmitted the transmitted voice signal. A conference telephone device comprising a speaker selection circuit for selecting the transmitted voice of the above and inputting it to the mixing and distributing circuit. 3. A two-wire type telephone in which transmitted voice and received voice are not separated is used as each of the telephones, and a two-line to four-wire conversion circuit is connected to each of the telephones. The conference telephone device according to claim 1 or 2.