Bus-based multi-party communication digital telephone system

Abstract

The invention provides a bus-based multi-party communication digital telephone system which comprises a differential bus (1) and a plurality of telephone sets (2). The telephone sets (2) are connected to the differential bus (1) in parallel. The telephone sets (2) comprise a microphone and microphone amplifying circuit (21), an A / D switching circuit (22), a single chip microcomputer module (23), a D / A switching circuit (24), a loudspeaker amplifying circuit (25) and a power source (26). According to the bus-based multi-party communication digital telephone system, the digital processing technology is adopted, the tone quality is better than that of an analog phone, the telephone sets are connected through two differential bus bodies, an interchanger which has to be arranged in an analog phone system is needless, cost is saved, multi-party communication by telephone can be achieved at the same time, the single chip microcomputer module is used for coding and decoding voice data, so that a large number of voice data are transmitted, and data collision during communication is prevented through the single chip microcomputer module.

Description

technical field [0001] The invention relates to a communication system, in particular to a bus type multi-party communication digital telephone system. Background technique [0002] The existing telephone system uses analog technology, which has the following problems: 1) the call quality is not high due to the use of analog form; When arranged in a straight line, such as the elevator alarm telephone system, each telephone is connected to the switch; 3), only up to 3 people can talk at the same time (the three-way call function is enabled through the telecommunications department), and the button needs to be switched during the call, so the operation is not easy. convenient. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the present invention proposes a bus-type multi-party communication digital telephone system with good sound quality, low cost, and multi-party simultaneous communication. It adopts two-wire differential bus mode to trans...

AI Technical Summary

Problems solved by technology

[0002] The existing telephone system uses analog technology, which has the following problems: 1) the call quality is not high due to the use of analog form; When arranged in a straight line, such as the elevator alarm telephone system, each telephone is connected to the switch; 3), only up to 3 people can talk at the same time (the three-way call function is enabled through the telecommunications department), and the button needs to be switched during the call, so the operation is not easy. convenient

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