Apparatus for inhibiting transient noise of audio power amplifier

Abstract

The invention discloses a device which can restrain the transient noise of an audio power amplifier and can reduce or eliminate the click noise generated in the loudspeaker when the audio power amplifier is switched on or off, or enters or exits the standby mode. The technique proposal of the invention is that the device includes a noise restraining control signal generation module and a noise restraining module. In the noise restraining control signal generation module, a first input terminal receives standby mode enable signal; a second input terminal receives the power supply voltage; a first output terminal is connected with the output of the audio power amplifier and outputs the standby signal to the output of the audio power amplifier; a second output terminal outputs time sequence control signal. In the noise restraining module, the input of the module is connected with the second output terminal of the noise restraining control signal generation module to receive the time sequence control signal; a first output terminal is connected between the audio power amplifier and a blocking capacitor; a second output terminal is connected between the loudspeaker and the blocking capacitor to restrain the transient noise in the loudspeaker, which is generated by the audio transient signal output from the audio power amplifier. The device of the invention can be applied in the audio playing field.

Description

technical field [0001] The present invention relates to an audio frequency amplifying device, in particular to a device for suppressing transient noise generated by an audio frequency power amplifying device. Background technique [0002] Audio transients during the turn-on or turn-off of a single-supply audio power amplifier used to drive speakers (headphones or horns) can produce "clicks" or other strange transient noises in the speaker. As people's expectations of product performance increase, the absence of transient noise has become an important criterion for people to choose products, and thus is a key selling point of portable audio equipment. [0003] Generally, the power-on and power-off process of audio equipment will not be repeated. However, in portable applications, reducing power consumption is the key to extending battery life. When certain functional modules are not required to work, these modules are generally disabled. It's possible that features could fur...

AI Technical Summary

Problems solved by technology

Therefore, if you want not to consume power in standby mode, but also want the circuit to respond quickly enough when switching from standby mode to normal working mode, then the traditional solution is outdated.

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