US 11,705,102 B2
Method and device for eliminating unstable noise
Chung-Hang Tsai, Hsinchu (TW); Hui-Chun Lien, Hsinchu (TW); and Yi-Kuei Chen, Hsinchu (TW)
Assigned to REALTEK SEMICONDUCTOR CORP., Hsinchu (TW)
Filed by REALTEK SEMICONDUCTOR CORP., Hsinchu (TW)
Filed on Dec. 29, 2021, as Appl. No. 17/564,787.
Claims priority of application No. 110100185 (TW), filed on Jan. 4, 2021.
Prior Publication US 2022/0215825 A1, Jul. 7, 2022
Int. Cl. G10K 11/178 (2006.01); H03F 1/30 (2006.01); H03G 3/34 (2006.01); H04R 3/02 (2006.01); H04R 29/00 (2006.01); H04R 3/00 (2006.01)
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
OG exemplary drawing
 
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.