Voice transmission method and device based on building intercom system, and building intercom system

Abstract

The invention discloses a voice transmission method and a voice transmission device based on a building intercom system, and the building intercom system. The method comprises the following steps that: a first call terminal receives an audio signal, acquires an amplified audio signal by amplifying the audio signal, coverts the amplified audio signal into a first differential signal, and transmits the first differential signal to a second call terminal through a differential transmission line; and the first call terminal receives a second differential signal from the differential transmission line, wherein the second differential signal comprises the first differential signal and a third differential signal which is transmitted by the second call terminal, a differential operational amplifier converts the second differential signal into a single sideband audio signal, the single sideband audio signal is subjected to anti-sidetone processing according to the amplified audio signal, and the processed single sideband audio signal is outputted. By the method, the device and the system, interference resistance capability of a signal during voice transmission is enhanced, a transmission distance is prolonged, the quality of the transmitted audio signal is improved, and voice transmission quality in the building intercom system is improved.

Description

technical field [0001] The invention relates to the field of building intercom, in particular to a voice transmission method based on the building intercom system, a voice transmission device based on the building intercom system, and a building intercom system. Background technique [0002] In the current implementation of building intercom systems, audio signals are usually transmitted over long distances through cables. However, in the process of long-distance transmission of audio signals through cables, due to reasons such as long transmission distances, physical characteristics of transmission lines, and electromagnetic interference, problems such as loss of audio receiving signals and degradation of signal-to-noise ratio often occur, which affect the received audio. The quality of the signal. Contents of the invention [0003] In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide a voice transmission me...

AI Technical Summary

Problems solved by technology

However, in the process of long-distance transmission of audio signals through cables, due to reasons such as long transmission distances, physical characteristics of transmission lines, and electromagnetic interference, problems such as loss of audio receiving signals and degradation of signal-to-noise ratio often occur, which affect the received audio. signal quality

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