Circuit and method for eliminating plosive sound of active noise-cancelling earphones and active noise-cancelling earphones

Abstract

The invention discloses a circuit, a method and an active noise reduction earphone for eliminating the blasting sound of an active noise reduction earphone. The circuit includes: a charging and discharging circuit, a power-on delay circuit and a power-off delay circuit; When the system is powered on, the speaker is controlled to output an audio signal through the first predetermined delay time; or when the system is powered off, the speaker is controlled to return to the state of outputting the audio signal through the third predetermined delay time; the power-on delay circuit is used to When the system is powered on, after the second predetermined delay time, the active noise reduction chip that controls the active noise reduction headset is powered on; the power-off delay circuit is used to control the active noise reduction through the fourth predetermined delay time when the system is powered off. The volume adjustment chip of the earphone is powered off. The circuit of the present invention can effectively eliminate the popping sound caused by switching on and off the active noise reduction earphone and adjusting the volume through pure hardware sequential circuit design, and is easy to implement and low in cost.

Description

technical field [0001] The invention relates to the field of active noise reduction earphones, in particular to a circuit and method for eliminating the plosive sound of the active noise reduction earphones and the active noise reduction earphones. Background technique [0002] The active noise reduction earphone is to add a noise reduction processing chip to the earphone wire control or the earphone, through the noise reduction processing chip to generate a reverse sound wave equal to the external noise, so as to neutralize and offset the external noise to achieve the effect of active noise reduction. Because the audio device in the headset is powered on, powered off and after the power is stabilized, the transient impact brought by various operations will produce a certain bursting sound (ie POP sound). The POP sound is caused by active noise reduction headphones. It is generated during power-on, power-off or voltage change, so it is related to the timing of power-on or po...

AI Technical Summary

Problems solved by technology

In the circuit structure of the existing active noise reduction earphones, when the power is turned on or off, the volume adjustment chip of the earphones, the active noise reduction chip and the output audio signal are powered on or off at the same time, thus generating noise such as POP sound, which affects the Headphone sound quality

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