Digital wire interphone

Digital wire interphone

A digital wire interphone is provided. The digital wire interphone comprises an interface signal conversion module, a digital signal processing chip, a voice encoder/decoder, an A/D and D/A converter, an audio power amplifier module, a loudspeaker and a microphone. The interface signal conversion mo...

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Hauptverfasser: TAN HONG, LING DONGHUI
Format: Patent
Sprache:chi ; eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING
TRANSMISSION
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LING DONGHUI
description A digital wire interphone is provided. The digital wire interphone comprises an interface signal conversion module, a digital signal processing chip, a voice encoder/decoder, an A/D and D/A converter, an audio power amplifier module, a loudspeaker and a microphone. The interface signal conversion module consists of an RS232 interface circuit and an RS485 interface circuit. The microphone, the A/D and D/A converter, the voice encoder/decoder, the digital signal processing chip and the RS232 interface circuit are sequentially connected. The RS485 interface circuit is connected with a data bus. The A/D and D/A converter, the audio power amplifier module and the loudspeaker are sequentially connected. The signal transmission of the digital wire interphone has relatively strong common mode anti-interference capability and relatively far transmission distance; the power supply voltage of the audio power amplifier module is increased so that the audio output power is improved; the filtration and decoupling between p
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING
TRANSMISSION
title Digital wire interphone
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