JP3151950B2 - Simultaneous communication device in loop network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast communication apparatus which can provide a voice communication in a loop type network so that a plurality of stations can talk at once.

[0002]

2. Description of the Related Art Conventionally, as a multi-station simultaneous communication method, an electronic exchange is used to connect to a terminal of a voice mixing trunk.
There has been proposed a method of connecting extensions participating in a conference (see Japanese Patent Application Laid-Open No. 59-122270). According to this method, during the meeting, everyone can hear the voice of the person who performed the hooking operation, and if another person performs the hooking operation,
Now everyone can hear that person's voice. In this way, the person who wants to talk can perform the hooking operation, so that everyone can hear his / her own story.

[0003]

However, according to the above-mentioned method, since the channel for speech and the channel for listening are common, the number of speakers is limited to one. For this reason, there was a problem that the meeting could not be carried out smoothly. Therefore, an object of the present invention is to solve the above-mentioned technical problem and to provide a simultaneous communication device capable of performing a smooth conference in a loop network.

[0004]

According to a first aspect of the present invention, there is provided a broadcast communication apparatus, comprising: a loop type network having two voice channels; and a master station having a voice signal of a second channel. Means for taking out and reproducing the sound signal, means for superimposing the sound signal of the own station on the sound signal taken out from the second channel and sending out to the first channel, means for sending out a silent signal to the second channel, Means for extracting the audio signal of the second channel, means for superimposing the audio signal of the own station on the audio signal extracted from the second channel, and transmitting the signal to the second channel; Means for taking out and reproducing the audio signal. Claim 2
The simultaneous call device described in the table indicates that any of the slave stations
When a talk request signal is sent to the master station, the master station
Command signal to enable simultaneous communication with local stations
It is characterized by issuing.

[0005]

According to the above construction, when a silent signal is sent from the master station to the second channel in a state where all stations can perform simultaneous communication, the silent signal is taken out by the first slave station, and the voice of the slave station is output. Superimposed on the signal,
It is loaded on the second channel and heads for the second slave station. In the second slave station, the audio signal of the slave station is superimposed on the second channel. By repeating such a process, a signal in which all the voices of the talkers of each slave station are mixed returns to the master station from the second channel.

[0006] The master station extracts and reproduces the audio signal of the second channel, and superimposes the audio signal of the own station on the audio signal extracted from the second channel and sends it out to the first channel. The slave station extracts and reproduces the audio signal of the first channel. In this way,
Voices spoken at an arbitrary timing in the master station and all slave stations are reproduced as they are in the master station and all slave stations in a mixed state.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is a specific example of a loop type network, in which time-division multiplexing devices S ₀ , S
_{1, S 2, ····, S} N-1, S N ( when representative uses the code "S") is connected. Time division multiplexer S
, Respectively, have telephones T ₀ , T ₁ , T ₂ ,.
T _N−1 and T _N (the symbol “T” is used for the representative) are connected.

As shown in FIG. 3, for example, a transmission frame of a signal transmitted through an optical fiber includes a 5-bit flag,
There are eight 8-bit data channels, and the broadcast channel is allocated to two of the 98 data channels. These are called A channel (first channel) and B channel (second channel). The number of bits of the transmission frame is 5 × 1 + 8 × 98 = 789 bits, and the bit transmission speed is 6.312 Mbps, so that one frame is transmitted at 125 μsec.

The time division multiplexer S ₀ and the talker T ₀ correspond to a master station, and the configuration of the time division multiplexer S ₀ is shown in FIG. Time division multiplexing apparatus S ₀ is, O-E converter 11 for converting an optical signal from the optical fiber into an electrical signal, B
A drop control unit 12 that drops a signal of a channel (meaning that the signal is branched and taken out), and inserts the signal into the A channel (means that it is superimposed on the signal).
In the superimposed portion, the previous signal disappears), an insert control unit 14 that inserts the signal into the B channel, and an EO that converts an electric signal into an optical signal.
It has a converter 15.

As shown in FIG. 1, a talker T ₀ is a D / A for converting a dropped B channel signal into an analog signal.
A converter 21, an amplifier 24, a speaker 25, a microphone 28, a switch 27 to be pressed when the user wants to talk, a superimposing circuit 26 for superimposing the B-channel signal and the audio signal of the microphone 28 in an analog manner, And an A / D converter 23 for converting a silent signal into a digital signal.

[0011] (excluding T ₀₎ time-division multiplexing apparatus S (except S ₀₎ and voice communication device T has been made to correspond to the slave station, showing its configuration in Fig. Time division (except for S ₀₎ multiplexing device S, inserts drop control unit 32 to drop the signal of the O-E converter 31, the B-channel for converting an optical signal into an electrical signal from the optical fiber, the signal on the B channel And an EO converter 35 for converting an electric signal into an optical signal.

As shown in FIG. 1, a talker T (excluding T ₀ ) includes a D / A converter 41 for converting a dropped B channel signal into an analog signal, and a switch 4 to be pressed when the user wants to talk.
3, a superimposing circuit 42 for superimposing the B-channel signal and the audio signal of the microphone 44 in an analog manner,
A / D converter 45 for digitally converting the output signal of D, and D for converting the dropped A channel signal to analog
A / A converter 48, an amplifier 47, and a speaker 46 are provided.

Next, the flow of signals in the network having the above configuration will be described with reference to FIG. When a caller dials a specific number at any of the slave stations, the slave station issues a simultaneous call request signal to the master station M. The master station M issues an A channel and B channel line connection command to all slave stations. As a result, all stations can be in a state in which they can talk at once. Silent signal from the insert control unit 14 is placed on the B channel of the master station M is dropped at the first slave station SL _1, it is superimposed on the audio signal of the slave station SL ₁ of the microphone 44. The superimposed signal is inserted into the B channel and goes to the _second slave station SL2. By repeating such a process, a signal in which all the voices of the talkers of each slave station are mixed returns to the master station M.
The master station M drops this signal, amplifies and reproduces it on the speaker 25, and inserts the signal into which the voice of the talker of the own station is superimposed on the A channel.
The signal of the A channel is dropped at each slave station and reproduced through the speaker 46. Therefore, the signals spoken by all the talkers are reproduced in a mixed state in all the slave stations.

In the above embodiment, the transmission frame of the signal transmitted through the optical fiber is time-division multiplexed. However, another division multiplexing method (for example, frequency division multiplexing) may be adopted.

[0015]

As described above, according to the broadcast communication apparatus of the present invention, in the loop type network, the voice spoken at an arbitrary timing in the master station and all slave stations is transmitted to the master station and all slave stations. Therefore, since it is reproduced as it is in a mixed voice state, it is possible to use the two channels to make a simultaneous call to all the stations with the same feeling as if the participants were actually gathering together.

Therefore, in a loop type network system such as a transmission line cable monitoring system and the like, it is effective when workers communicate with each other by voice.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating channels in order to explain the flow of signals in a loop network.

FIG. 2 is a diagram showing a loop type network to which the broadcast communication apparatus of the present invention is applied.

FIG. 3 is a diagram of a transmission frame of a signal transmitted through a loop.

FIG. 4 shows a time-division multiplexer S ₀ and a talker T of a master station.
It is a block diagram of ₀ .

FIG. 5 is a block diagram of a time division multiplexer S and a talker T of a slave station.

[Explanation of symbols]

 A audio channel B audio channel 12 drop control unit 13 insert control unit 14 insert control unit 26 superposition circuit 32 drop control unit 33 insert control unit 34 drop control unit 42 superposition circuit

Continuation of front page (56) References JP-A-62-284541 (JP, A) JP-A-63-179657 (JP, A) JP-A-5-30121 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) H04L 12/42

Claims (2)

(57) [Claims] An audio channel is provided in a network in which one master station and a plurality of slave stations are connected in a loop.
In a simultaneous communication device which enables simultaneous communication at a number of stations, there are two said audio channels, and the master station extracts and reproduces an audio signal of the second channel, and extracts the audio signal from the second channel. Means for superimposing the sound signal of the own station on the sound signal and sending it to the first channel; means for sending a silent signal to the second channel; each slave station taking out the sound signal of the second channel Means for superimposing the audio signal of the own station on the audio signal extracted from the second channel and sending it to the second channel, and means for extracting and reproducing the audio signal of the first channel. Broadcast device in a loop-type network. 2. A broadcast request signal from any of the slave stations.
To the master station, the master station
To issue a command signal to enable simultaneous call
The loop network according to claim 1,
A simultaneous call device.