CPC G10K 11/17825 (2018.01) [G10K 11/17853 (2018.01); H03F 1/305 (2013.01); H03G 3/348 (2013.01); H04R 3/02 (2013.01); H04R 29/00 (2013.01); G10K 2210/1082 (2013.01); H03F 2200/03 (2013.01); H04R 3/007 (2013.01)] | 14 Claims |
1. A method for eliminating unstable noise, applicable to a sound recording device and implemented by a codec, the method for eliminating unstable noise comprising:
activating the sound recording device to start recording;
setting a suppression duration and a cutoff frequency switching duration according to unstable noise and a DC offset value of the sound recording device;
processing a front-end audio of a recorded sound by a filter having a first cutoff frequency to make the unstable noise in the front-end audio quickly converge, and outputting a filtered audio signal;
suppressing the filtered audio signal according to the suppression duration to eliminate the unstable noise; and
adjusting the first cutoff frequency of the filter to a second cutoff frequency according to the cutoff frequency switching duration, wherein the first cutoff frequency is greater than the second cutoff frequency.
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