Entrance guard double-end talkback method and system based on single-line transmission

Abstract

The invention discloses an entrance guard double-end talkback method and system based on single-line transmission. The uplink voice processing steps of the entrance guard double-end talkback method are as follows: acquiring a voice signal acquired by a microphone; processing the voice signal to remove the local loudspeaker playing voice in the voice collected by the microphone; performing noise reduction processing on the voice signal to remove local noise in the voice; performing sound effect processing on the voice signal; and sending the voice signal to a transmission bus. The downlink voice processing comprises the following steps: acquiring a voice signal from a transmission bus; processing the voice signal to remove an acquisition signal of a local microphone; performing noise reduction processing on the voice signal to remove noise of the opposite side and local residual line echo; performing sound effect processing on the voice signal; and driving a loudspeaker to perform sound reproduction according to the processed voice signal. According to the invention, double-end talkback is supported under the condition of single-wire transmission, and better voice double-end talkback performance and quality are achieved.

Description

technical field [0001] The invention belongs to the field of access control, and relates to a double-terminal intercom method and system for access control based on single-wire transmission. Background technique [0002] At present, users outside the house and users inside the house can conduct double-terminal intercom through the access control system. For example, the courier delivered the goods, and was blocked from the door downstairs. After a simple conversation with the upstairs user through the access control double-terminal intercom system, he went upstairs to deliver the goods. [0003] In order to save costs, the current popular double-terminal intercom system for access control still uses analog circuits, and in order to further reduce costs, only one line is used for the transmission signal line, and an arbitration circuit is used to judge which end of the user's voice occupies the transmission line (a commonly used The method is that the user-side voice with st...

AI Technical Summary

Problems solved by technology

[0003] In order to save costs, the current popular double-terminal intercom system for access control still uses analog circuits, and in order to further reduce costs, only one line is used for the transmission signal line, and an arbitration circuit is used to judge which end of the user's voice occupies the transmission line (a commonly used The method is that the user-side voice with strong sound energy occupies the transmission line), so it is still single-ended intercom in essence, and cannot support double-ended simultaneous intercom for a long time. At the same time, due to the error of the arbitration circuit, the sound may be intermittent, and the experience poor effect

[0004] At present, the transmission line of the double-terminal intercom system based on digital circuits has two lines, the uplink and the downlink, which cannot be compatible with the old system.

If all the systems outside and inside the house are replaced, the cost will be too high and it will be difficult to promote

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