An extended pickup with mute function and its realization method

Abstract

The invention discloses an extensible pick-up with a mute function. A microphone is connected with an audio amplification filter circuit, the audio amplification filter circuit is connected with a single-end to difference circuit, the single-end to difference circuit is connected with a difference to single-end circuit through an analog difference signal line, the difference to single-end circuit is connected with an analog-digital conversion circuit, and the analog-digital conversion circuit is connected with a main control chip; a mute press button is connected with a second microprogrammed control unit (MCU), the second MCU is connected with a second digital signal producing circuit, the second digital signal producing circuit is connected with a first digital signal receiving circuit through the analog difference signal line, the first digital signal receiving circuit is connected with a first MCU, and the first MCU is connected with the main control chip; the first MCU is connected with a first digital signal producing circuit, the first digital signal producing circuit is connected with a second digital signal receiving circuit through the analog difference signal line, and the second digital signal receiving circuit is connected with the second MCU; thereby, digital control signal communication is reliable, and audio signal transmission anti-interference is high.

Description

technical field [0001] The invention relates to an extended sound pickup with a mute function and a realization method thereof. Background technique [0002] In the prior art, the implementation scheme of the mute function of the extended pickup is generally: the mute signal and the plug-in / out state of the extended microphone (extended pickup) are represented by the change of the DC bias of the audio signal on the audio transmission line. Specifically: when the extension microphone is connected to the host (the host includes but not limited to the conference phone), the host will detect the DC bias of the audio signal; when the extension microphone is disconnected from the host, there will be no DC offset; when the extension When the microphone is connected to the host, press the mute button on the extension microphone, and the DC bias is directly pulled to a low level by the button, which is equivalent to the extension microphone sending a low-level pulse signal to the hos...

AI Technical Summary

Problems solved by technology

[0003] However, the disadvantages of the implementation scheme of the mute function of the extended pickup in the prior art are: 1. When the user presses the mute key of the extended microphone for a long time, the DC bias will always remain at a low level, and the host will think that the extended microphone is disconnected. The connection is opened; second, it is unreliable to rely on a single pulse signal for transmission. The host may miss the pulse signal sent by the extension microphone, and then the user presses the mute button, and the mute indicator light on the extension microphone is on, but the host does not. Mute situation

Images