JPS62291298A - Inter-dissimilar code connecting system for time divisional automatic exchange - Google Patents

Abstract

PURPOSE:To connect parties having different coding systems with each other, by providing a sound coding conversion device which converts a system to the coding system of a caller side, based on coding system information. CONSTITUTION:At the time of receiving an incoming call by a caller side, the sound coding signal RVD of said coding is stored in a speech path memory SPM. And when a read timing for said sound coding signal arrives, said sound coding signal is read out from the memory SPM by the address designation of a hold memory HM, and it is supplied to a sound code conversion device TR through a selector SEL. Simultaneously, the encoding system information is supplied to a decoder DEC from the memory HM, and the conversion classification information is supplied from the decoder DEC to the device TR. The device TR converts said sound coding signal to a different sound encoding signal, and sends it to a network in a time divisional exchange as the sound coding signal TVD of the caller side.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a connection system between different voice codes in a time division automatic switching system.

(Prior Art) In a time division automatic switching system, an analog signal such as voice is converted into a digital voice code, and the converted digital voice code is used to perform switching processing. Also, as these companding methods for converting digital audio codes into analog signals, for example,
W method and ALaW method are used.

Conventionally, these mutually different types of speech codes have not been connected.

(Problems to be Solved by the Invention) In conventional time-division automatic switching systems, there are cases where the companding method for voice encoding of digital telephones and digital terminal devices is different from the companding method of the time-division automatic switching system, and when When interconnecting time-division automatic exchanges using one digital line, if the companding methods of each time-division automatic exchange are different, it is necessary to connect the two with different encodings. The problem was that it couldn't be done.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the problem that parts having different sound codes cannot be connected to each other, and to make it possible to automatically connect these parts according to each different sound code.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a speech path memory that stores voice encoded signals of a calling side in time, and a voice code read out from the speech path memory. a speech code conversion device that converts the coded signal into a speech coded signal using a different method or outputs it to the called party without the conversion; and an address signal of the speech path memory and the address signal that form a pair and each of the above conversions. or a hold memory for storing encoding method information for specifying no conversion, and the voice encoded signal is read from the speech memory in response to the address signal at an assigned timing, and the voice code conversion is performed. The device converts the read audio encoded signal into a different type of encoded signal based on the encoding system information paired with the address signal, or outputs it to the called party without conversion. .

(Function) According to the present invention, at the assigned reading timing, the speech path memory is addressed by the hold memory, the speech coded signal of the calling side is read out, and at the same time, the speech coded signal of the signal is read out. Encoding method information indicating the encoding method and the called side's encoding method is provided from the hold memory to the voice transcoder. Then, the voice code conversion device converts the read voice encoded signal of the calling side into a voice encoded signal according to the encoding method of the called side based on the encoding method information, and and the calling side are connected with different codes.

(Embodiment) FIG. 1 is a system diagram of a connection system between different codes, showing an embodiment of the present invention.

In the figure, RVD is receive voice data, which is voice code conversion on the calling side, and consists of signals in which analog signals such as voices are encoded using various methods. SPM is a speech path memory that stores encoded audio signals one by one, and has a storage capacity corresponding to the size of this system (number of channels). HM is a hold memory, and the speech path memory SPM corresponds to each timing.
It stores an address signal indicating to which channel the B voice encoded signal is to be output, and encoding method information for voice code conversion, which will be described later, in combination with the address signal.

FIG. 2 is an explanatory diagram of the code for one channel of the hold memory HM. In this embodiment, there are two encoding methods, method X and method Y, and the first bit is the code of the calling side. When the system is X, it is O, and when it is Y, it is 1. The second bit indicates the coding method information of the called side; similarly, if the method is X, O, Y
Set to 1 when . Note that as these two methods, for example, the μLaW method and the A Law method are used. Third
-nth pit is an address signal for reading out the speech path memory SPM by specifying a channel.

The DEC is a decoder that receives the encoding system information in the hold memory HM and outputs it as conversion type information to a line corresponding to each conversion (not indicated by an arrow) as an alternative conversion type information. TNS is a tone sender that digitizes each tone signal using a predetermined encoding method (either X or Y) and stores it. SEL- is a selector which switches and outputs the tone coded signal of the tone sender TNS and the voice coded signal of the speech memory SPM at a suitable time. TR is phonetic code change 1
! ! 2! The decoder D at this time receives the encoded speech signal from the speech path memory SPM.
Based on the conversion type information by C, the tone coded signal of the tone sender TNS is converted into a voice coded signal based on the called side's coding system, or the tone coded signal of the tone sender TNS is similarly converted into a tone code based on the called side's coding system. Audio code conversion vt setting TR
Possible configurations include a bit replacement method and a memory method. In the bit replacement method, a bit that is regularly inverted between method X and method Y is observed, and the 1-ta of that bit is replaced from O→1.1→0. On the other hand, in the memory method, the memory has two sides, and one side uses the audio code of system X as an address, and its output data is the audio code of system Y. The other side does the opposite. TVD is transmit voice data, which is a voice coded signal of the called side output from the voice transcoder TR.

The operation of the above configuration will be explained below.

When a call is received on the calling side, the encoded receive voice data (voice encoded signal) RVD is stored in the speech path memory SPM under the control of a separate time division switch. At this time, a timing (channel) signal is sent to the third address signal of the hold memory HM as an address signal for reading out the speech coded signal from the speech path memory SPM.
- Stored in the nth bit. The audio encoded signal in this case is based on, for example, method X, and "0" is stored in the first pit. Further, the coding method of the called side is indicated based on dial information etc. by the calling party, and in this case, for example, if it is based on method Y, "1" is stored in the second bit.

When the timing for reading out the encoded voice signal from the speech path memory SPM is reached, the encoded voice signal is read out by address designation of the halter HM and is applied to the encoded voice signal MTR via the selector SEL. At the same time, the encoding method information is provided from the hold memory HM to the decoder DEC, and the conversion type information X-+Y is provided from the decoder DEC to the audio code converter TR.

Voice encoding conversion 1iiITR converts the voice encoded signal of the X method into the voice encoded signal of the Y method and transmits voice data (voice encoded signal of the called side) 1°VD.
The data is output to a network of time division switches (not shown) as

Further, when a tone encoded signal is output from the tone sender NS by selection of the selector SEL, the voice transcoding device TR refers to the conversion type information by the decoder DEC and similarly converts the conversion method of the called side. The signal is converted into an encoded signal and output.

(Effects of the Invention) As explained above, according to the present invention, devices of each encoding method are connected to each other through conversion corresponding to each encoding method. Effective connections can be made between systems and between countries, regardless of each other's encoding systems.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a connection method between different codes according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of data in a hold memory. RVD...Receive voice data (voice coded signal on the calling side) TVD...Transmit voice data (coded voice signal on the called side) SPM...Speech path memory TR...voice code conversion device HM.・Hold memory

Claims (1)

[Scope of Claims] A speech path memory that stores voice coded signals from a calling side one by one, and a device for converting or converting the voice coded signals read from the speech path memory into voice coded signals using a different method. a voice transcoding device that outputs to the called party without any conversion; and an address signal of the speech path memory and encoding method information that is paired with the address signal and is used to specify each of the conversions or no conversion. and a hold memory, wherein the voice coded signal is read from the speech memory in response to the address signal at an assigned timing, and the voice code conversion device converts the encoded method information paired with the address signal into the voice coded signal. A method for connecting between different types of codes in a time-division automatic switching system, characterized in that the read voice coded signal is converted into a different type of coded signal based on the signal, or is outputted to the called side without conversion.