JPH03123171A - System for sharing voice communication and data communication - Google Patents

Abstract

PURPOSE:To simplify the equipment and to improve the data communication speed by providing a selecting means for selecting one of a second digital sound signal or a digital data signal of a law converting means as a signal for communication. CONSTITUTION:In the case of executing a voice communication, an analog sound signal inputted to an analog signal input/output terminal 2 passes through an encoding/decoding circuit 4 and converted to a digital signal by mu-law. Subsequently, it passes through a law converting circuit 5 and converted to a digital signal by A-law, selected by a selecting circuit 6, passes through a digital switching network 7 and outputted to an international digital circuit 8. In the case of executing a data communication, a digital data signal inputted to an input/output terminal 3 is selected by the selecting circuit 6, passes through the digital switching network 7 and outputted to the international digital circuit 8. In such a way, the data communication can be executed as a digital signal without converting it to an analog signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for sharing voice communication and data communication in an international digital line system in which the rules for encoding and decoding voice signals are different.

[Conventional technology]

FIG. 2 is a block diagram showing an example of a conventional sharing system for voice communication and data communication.

Switching between voice communication and data communication is performed by switching the connection of the selection circuit 16 of the terminal 11.

In the case of voice communication, analog signal input/output terminal 2 of terminal 11
The analog audio signal input to the selection circuit 16
μ-1aw is input to the encoding/decoding circuit 4 through
(or A-1aw) law. This signal passes through the digital switching network 7 and is sent to A
The signal is input to a law conversion circuit 15 that converts the law between −1 aw and μm law, is converted into a proper digital signal, and is output to the international digital line 8 . The digital sound wheel signal input to the international digital line 8 is
It is converted into a proper digital signal by the conversion circuit 15,
Digital switching network7. The signal passes through the encoding/decoding circuit 4, is converted into an analog signal, passes through the selection circuit 16, and is output to the analog signal input/output terminal 2.

In the case of data communication, the digital data signal input to the digital signal input/output terminal 3 of the terminal 11 is transmitted to the modem 19.
The signal passes through the selection circuit 16 and is converted back into a digital signal by the encoding/decoding circuit 4. This signal is subjected to law conversion by the law conversion circuit 15, as in the case of voice communication, and then output to the international digital line 8. Further, the digital data signal input to the international digital line 8 is converted into an analog signal by the encoding/decoding circuit 4 after law conversion by the law conversion circuit 15, and is converted into an analog signal by the modem 19 through the selection circuit 16. The signal is converted and output to the digital signal input/output terminal 3.

[Problem to be solved by the invention]

The conventional voice communication and data communication sharing method described above is
Since the law conversion between A-1aw and μmlaw is performed before entering the switching network from the international digital line, on the terminal side after passing through the switching network, data communication cannot be performed as a digital signal on the same line. After converting the data into an analog signal, the data must be converted back into an A-1aw or Par-1a digital signal for communication. Therefore, there are problems in that the equipment becomes complicated and the data communication speed decreases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for sharing voice communication and data communication in a digital line system, which makes it possible to simplify equipment and improve data communication speed.

[Means to solve the problem]

The voice communication and data communication sharing method of the present invention is an encoding/decoding method that performs signal conversion between an analog voice signal and a first digital voice signal based on a first encoding/decoding law for voice signals. means, connected to the encoding/decoding means, to encode the first digital audio signal and the second encoding/decoding law based on the first encoding/decoding law and the second encoding/decoding law of the audio signal. law conversion means for performing law conversion between digital audio signals; and selection means for selecting either the second digital audio signal or the digital data signal of the law conversion means as a signal to be communicated; and the data signal are shared.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the digital line system of this embodiment, a terminal 1 that inputs and outputs voice signals and data signals is connected to an international digital line 8 via a digital switching network 7. The terminal 1 is also connected to an analog signal input/output terminal 2 for inputting and outputting analog audio signals, a digital signal input/output terminal 3 for inputting and outputting digital data signals, and an analog signal input/output terminal 2. An encoding/decoding circuit 4 that performs signal conversion between analog signals and digital signals based on the encoding/decoding law, and an encoding/decoding circuit 4 that is connected to the encoding/decoding circuit 4 and performs encoding between A-1aw and μmlaw of digital signals.・
It includes a law conversion circuit 5 that performs decoding law conversion, and a selection circuit 6 that is connected to the law conversion circuit 5 and the digital signal input/output terminal 3 and selects connection to the digital switching network 7.

Next, the encoding/decoding law of audio signals is
a. Explain the operation.

When performing voice communication, the analog voice signal input to the analog signal input/output terminal 2 passes through the encoding/decoding circuit 4 and is converted into a μmlaw digital signal.
It is converted into a digital signal by Alaw through the w conversion circuit 5, selected by the selection circuit 6, and sent to the digital exchange network 7.
The signal is output to the international digital line 8 through the . Further, the A-1aw digital audio signal inputted from the international digital line 8 passes through the digital exchange network 7, is selected by the selection circuit 6, is converted into a μmlaw digital signal by the law conversion circuit 5, and is converted into a μmlaw digital signal. - It is converted into an analog signal by the decoding circuit 4 and output to the analog signal input/output terminal 2.

When performing data communication, the digital data signal input to the digital signal input/output terminal 3 is selected by the selection circuit 6 and output to the international digital line 8 through the digital switching network 7. Further, the digital data signal input from the international digital line 8 passes through the digital switching network 7, is selected by the selection circuit 6, and is output to the digital signal input/output terminal 3.

As described above, data communication can be performed directly as a digital signal without converting it to an analog signal.

Note that even if the encoding and decoding rules for audio signals are switched between μ-1aw and A-1aw, the same implementation as described above is possible.

〔Effect of the invention〕

As explained above, the voice communication and data communication sharing system of the present invention converts digital signals during data communication into analog signals in an international digital line system with different rules for encoding and decoding voice signals. It becomes possible to share voice communication and data communication without conversion,
This has the effect of simplifying equipment and improving data communication speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional sharing system for voice communication and data communication. 1.11...Terminal, 2...Analog signal input/output terminal, 3...Digital signal input/output terminal, 4...Encoding/decoding circuit, 5, 15...Law conversion circuit, 6 .1
6...Selection circuit, 7...Digital switching network, 8...
・International digital line, 19...modem.

Claims (1)

[Claims] encoding/decoding means for performing signal conversion between an analog audio signal and a first digital audio signal based on a first encoding/decoding law for audio signals; law conversion means for performing law conversion between the first digital audio signal and the second digital audio signal based on the first encoding/decoding law and the second encoding/decoding law of the signal; and a selection means for selecting either the second digital audio signal or the digital data signal of the law converting means as a signal to be communicated, and the communication between the audio signal and the data signal is carried out in common. A method for sharing voice and data communications in a digital line system.