JPH01137762A - Voice encoder - Google Patents

Abstract

PURPOSE:To decide the setting-up of a trunk and to enable the transmission of a dial pulse by converting synchronizing pulse to a synchronism detection confirming signal by means of a synchronization detection means and a pulse generating means at the incoming side when a synchronizing pulse arrives at an incoming and returning the signal to an outgoing side. CONSTITUTION:A transmission signal including a frame synchronizing signal from the outgoing side is sent from the transmission terminal 8. In a voice encoder on the incoming side, after the input of a reception signal (a) to a reception terminal 9 is started, a synchronizing signal is detected by the synchronization detection circuit 10, and a synchronization detection signal (b) is generated after a synchronization pull-in time t1 lapses. The signal (b) is converted to a synchronization confirming signal (c) in the pulse generating means 12, and the signal (c) goes through an AND circuit 3, then encoded in a connection signal coding circuit 6, and transmitted. The signal (c) is returned from the outgoing side, goes to a confirming signal (c'), and is received by a voice encoder on the outgoing side. The holding time at a line exchange can be shortened in minimum since a dial pulse (d) representing the extension number of a line exchange on the incoming side is transmitted from a line exchange or a relay exchange.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a voice encoding device capable of transmitting and receiving connection signals such as dial pulses in a toll dial network system including a telephone exchange.

[Conventional technology]

Recently, in order to increase line efficiency when constructing a toll dial network system within a company, a method has been developed in which a voice encoding device multiplexes a connection signal into a voice code and transmits the same.

Conventionally, an example of this type of speech encoding device is one in which the AND circuit 3 and the pulse generation circuit 12 are removed from FIG. 1, and the encoding section includes a speech encoding circuit 5 for encoding speech,
A connection signal encoding circuit 6 that encodes a connection signal, a frame synchronization generation circuit 4, and a multiplexing circuit 7 that multiplexes these.
and a synchronization detection circuit 10 in the decoding section, and a separation circuit 1 operated by the detected frame synchronization signal.
1, connection signal decoding circuits 1 and 3 that decode the connection signal code separated by this separation circuit 11, and a voice decoding circuit 14 that decodes the voice code.

Therefore, when this voice encoding device is connected to a network between two opposing locations as shown in FIG. 3, the voice encoding devices 21 and 22 are always facing each other on a one-to-one basis, so dial pulses are constantly transmitted and received. This was possible, and the calling side could send dial pulses at any time.

However, in a network configured with the trunk exchange 30 as a node and three or more systems of voice encoding devices 21 to 24 and line exchanges 41 to 44 arranged in a star shape as shown in FIG. Exchange machine 41
After sending the game dial signal to the relay exchange 30,
The voice encoding device 21 does not enter the opposing state until the transit exchange 30 determines the opposite end from the dial signal and seizes the line. Therefore, the line exchange 42 on the receiving side
44 can only be sent after synchronization is established by signals sent from the voice encoding devices 22 to 24 on the called side.
Alternatively, the relay exchange 30
There is a drawback in that it is necessary to suspend the transmission of dial pulses representing the extension number with plenty of time until it is considered that synchronization has been reliably established by the signal sent from 24.

[Problem that the invention seeks to solve]

The purpose of the present invention is to address the above-mentioned drawbacks; namely, in a network where three or more systems of voice encoding devices and line exchanges are arranged and connected in a star pattern, it is necessary to set the extension number with plenty of time until it is considered that synchronization has been reliably established. An object of the present invention is to provide a voice encoding device that solves the problem that it is necessary to suspend the sending of dial pulses.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention includes a means for encoding audio in an encoding section, a means for not generating a frame synchronization signal, and a means for generating a dial pulse or the like by ANDing the generated pulse from the decoding section. It has means for encoding the connection signal, means for multiplexing these outputs, and means for detecting a frame synchronization signal in the decoding section, means for separating the received signal, and decoding the audio. The present invention employs a configuration including a heavy membrane, means for decoding the connection signal, and means for generating pulses based on the output signal of the frame synchronization detection means.

[Effect]

Since the present invention is configured as described above, in the encoding section, audio is digitally encoded by the audio encoding means, and connection signals such as dial pulses are digitally encoded by the connection signal encoding means after passing through an AND gate. These encoded signals are multiplexed together with a synchronization signal from a frame synchronization signal generation means and sent out by a multiplexing means, and in the decoding section, the received signal is sent to a synchronization detection circuit and a separation means. and input the separated audio and connection signals to the decoding means? It is the same as before that each signal is decoded and not received.

Next, in the decoding section, the output of the synchronization detection means is input to the pulse generation means, becomes a one-shot pulse synchronization detection confirmation signal, and is input to the above-mentioned AND gate. Therefore, when a synchronization pulse from the calling side reaches the receiving side, it becomes a synchronization detection confirmation signal by the synchronization detection means and pulse generating means in the decoding section on the receiving side, and this is returned from the coding section on the receiving side to the sending side. When the caller arrives, it is determined that the trunk has been established, and the calling side immediately sends out a dial pulse.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, which shows a block circuit diagram of an embodiment of the present invention, the speech encoding device of the present invention includes a speech encoding circuit 5 that digitally encodes an input from an audio input terminal 1 in an encoding section. , a frame synchronization detection means 4 which generates a frame synchronization signal, and an AND circuit 3 which ANDs a connection signal such as a dial pulse from the connection signal input terminal 2 and a generated pulse from the pulse generation circuit 12 of the receiving section. , a connection signal encoding circuit 6 that digitally encodes the output of this AND circuit 3, and a multiplexing circuit 7 that multiplexes the outputs of these circuits 4, 5, and 6 and sends it to a transmission terminal. The encoding section includes a synchronization detection circuit 10 and a separation circuit 11 connected to the reception terminal 9, and a connection signal decoding circuit 13 that decodes the connection signal separated by the separation circuit 11 and outputs it to the connection signal output terminal 15. An audio output terminal 16 that decodes the audio code separated by the separation circuit 11 and outputs it to the audio output terminal 16, and a pulse generation circuit that is connected to the synchronization detection circuit 10 and sends a pulse to the AND circuit 3 of the transmitting section. 12, and the AND circuit 3 compared to the conventional circuit.
and a pulse generating circuit 12 are added. Further, a timing diagram of this embodiment is shown in FIG.

Next, the operation of this embodiment will be explained in Figs. 1, 2, and 4.
This will be explained using figures. In FIG. 4, for example, the line exchange 41, the voice encoding device 21, and the relay exchange 30 are assumed to be the originating side, and the line exchange 42 and the voice encoding device 22 are assumed to be the receiving side.

First, a transmission signal having a frame synchronization signal is sent from the transmission terminal 8 from the transmission side. Voice encoding device 2 on the receiving side
2, after the reception signal a (Fig. 2) starts to be input to the reception terminal 9, the synchronization signal is detected by the synchronization detection circuit °10, and the synchronization detection signal b (Fig. 2) is generated after the synchronization pull-in time tl. .

This signal becomes a synchronization confirmation signal C represented by a one-shot pulse in the pulse generation circuit 12, and then is encoded by the connection signal encoding circuit 6 via the AND circuit 3 of the encoding section and sent out.

This one-shot pulse synchronization detection confirmation signal C is returned from the called side as a confirmation signal C' and is received by the voice encoding device 21 on the calling side, and is sent to the line exchange 41 or the relay exchange 3.
A dial pulse d is sent from 0 to the line exchange 0 extension number of the called side.

Therefore, there is an advantage that the holding time from the confirmation of the trunk on the called side to the sending of dial pulses is reduced to a minimum.

Note that the operation thereafter is completely unchanged from the conventional one.

〔Effect of the invention〕

As explained above, according to the present invention, the encoder includes a means for encoding audio, a means for generating a frame synchronization signal, and a connection signal by ANDing the pulses from the pulse generator of the decoder. and means for multiplexing these outputs; means for detecting a frame synchronization signal in the decoding section; means for separating received signals; and means for decoding audio; By having means for decoding the connection signal and means for generating pulses using the output signal of the frame synchronization detecting means, the present speech encoding device can be used to create a star-shaped talk dial network with trunk exchanges as nodes. In this case, the calling side circuit exchange or transit exchange has the advantage that it can minimize the hold time from determining the destination side trunk to sending out dial pulses.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram of an embodiment of the present invention, Fig. 2 is a timing diagram of Fig. 1, Fig. 3 is a one-to-one network diagram, and Fig. 5 is a star configuration with trunk exchanges as nodes. FIG. 1... Audio input terminal, 2... Connection signal input terminal, 3... AND gate, 4...
・Frame synchronization generation circuit, 5...Audio encoding circuit, 6...Connection signal encoding circuit, 7...
・Multiplex circuit, 8... Transmission terminal, 9...
・Reception terminal, 10...Synchronization detection circuit, 11...
...Separation circuit, 12...Pulse generation circuit,
13... Connection signal decoding circuit, 14...
・Audio decoding circuit, 15... Connection signal output terminal, 16... Audio output terminal, a... Received signal, b... Synchronization detection signal, C1C'...
... Confirmation signal, d... Transmission connection signal, d'...
...Reception connection signal. Agent Patent Attorney Susumu Uchihara MMM: Maruko Nude) Kei L Nanai Zuyuki 3 @

Claims (1)

[Claims] The encoding section has means for encoding audio, means for encoding connection signals such as dial pulses, means for generating frame synchronization signals, and means for multiplexing these, and the decoding section means for detecting the frame synchronization signal, separation means for separating the received signal into voice and connection signal using the detected frame synchronization signal, means for decoding the voice and means for decoding the connection signal. An audio encoding device comprising: means for generating a pulse based on a frame synchronization detection signal of the decoding section; and means for inserting the output pulse into the encoding section connection signal. Encoding device.