Method for realizing signal transmission between fire-fighting telephone host and extension

Abstract

The invention discloses a method for realizing signal transmission between a fire-fighting telephone host and extensions, and the method comprises the steps that the fire-fighting telephone host issues an inspection command to each fire-fighting telephone extension in real time, and when the fire-fighting telephone host needs to communicate with the fire-fighting telephone extension of a certain address, the fire-fighting telephone host sends a communication command to the address; the fire-fighting telephone extension generates ringing after receiving the instruction; the fire-fighting telephone extension returns an off-hook command to the fire-fighting telephone host after off-hook; when the fire-fighting telephone host starts a call after detecting an off-hook command, the fire-fightingtelephone host issues a signal in a digital modulation mode, the fire-fighting telephone extension demodulates the signal after receiving the signal issued by the fire-fighting telephone host, and the signal is processed by the DAC to restore a voice signal; and after the call is ended and the hang-up is finished, the fire-fighting telephone host lists the fire-fighting telephone extension address into the inspection range again. Through the above scheme, the method achieves the purposes of high conversation quality and no interference, and has very high practical value and popularization value.

Description

technical field [0001] The invention belongs to the technical field of firefighting, and in particular relates to a method for realizing signal transmission between a firefighting telephone host and extensions. Background technique [0002] The fire telephone is a special equipment for fire communication. When a fire breaks out, it can provide people with convenient and fast means of communication. It is an indispensable communication equipment in the fire control and alarm system. At present, most of the common fire telephone hosts on the market are bus-based, that is, they communicate with fire telephone extensions through two buses, and the signals are coupled to the bus for transmission through coupling. The components used for signal coupling are ordinary capacitors, which will generate echoes during telephone calls, which will cause certain troubles to the calls, and the signals transmitted on the bus are analog signals, which are easily interfered during transmission ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for realizing the signal transmission between the main unit and the extension of the fire telephone, which mainly solves the problem that the voice signal existing in the prior art is transmitted through the analog signal on the bus, which is easily disturbed and affects the call during the transmission process. The problem of quality while echoing

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