Howling suppression method and apparatus, and in-ear earphones and storage medium

Patent metadata

Field	Value
Publication number	US-12574680-B2
Application number	US-202118683037-A
Country	US
Kind code	B2
Filing date	Dec 23, 2021
Priority date	Aug 25, 2021
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

Disclosed is a howling suppression method, including: determining, according to an audio signal collected by a microphone, whether a howling event occurs; if a howling event occurs, determining a howling type corresponding to the howling event; if the howling type is impulse wave howling, reducing an amplitude gain of a frequency band to which the howling event belongs, and performing a filtering process on the audio signal the amplitude gain reduction of which is reduced, to obtain a target audio signal; and controlling a speaker to play the target audio signal. According to the present disclosure, howling event suppression effect can be improved, thereby reducing the damage of audio playing to the hearing of a user. Further disclosed in the present disclosure are a howling suppression apparatus, an in-ear earphone, and a storage medium, to which the howling suppression method is applied.

First claim

What is claimed is:

1 . A howling suppression method, comprising:
determining, according to an audio signal collected by a microphone, whether a howling event occurs; if a howling event occurs, determining a howling type corresponding to the howling event; if the howling type is impulse wave howling, reducing an amplitude gain of a frequency band to which the howling event belongs, and performing a filtering process on the audio signal the amplitude gain reduction of which is reduced, to obtain a target audio signal; and controlling a speaker to play the target audio signal.

2 . The howling suppression method of claim 1 , wherein performing a filtering process on the audio signal the amplitude gain reduction of which is reduced, to obtain the target audio signal comprises:
determining a speaker reference signal collected by a feedback microphone; inputting the speaker reference signal and the audio signal the amplitude gain reduction of which is reduced into an adaptive filter, to obtain a first filtering result; inputting the first filtering result and the audio signal the amplitude gain reduction of which is reduced into a nonlinear post-processing filter, to obtain a second filtering result; and superimposing the first filtering result and the second filtering result to obtain a superposed result, and subtracting the superposed result from the audio signal, to obtain the target audio signal.

3 . The howling suppression method of claim 1 , wherein determining, according to an audio signal collected by a microphone, whether a howling event occurs comprises:
determining, according to an amplitude of the audio signal collected by the microphone, whether a howling event occurs.

4 . The howling suppression method of claim 3 , wherein determining the howling type corresponding to the howling event comprises:
extracting a feature vector from the audio signal; inputting the feature vectors into a howling type determining model; and determining the howling type corresponding to the howling event according to an output result of the howling type determining model.

5 . The howling suppression method of claim 1 , further comprising: after determining the howling type according to the frequency band to which the howling event belongs, if the howling type is non-impulse wave howling, performing a filtering process on the collected audio signal by using an adaptive filter, to obtain the target audio signal.

6 . The howling suppression method of claim 1 , wherein reducing the amplitude gain of the frequency band to which the howling event belongs comprises:
determining a gain change amount according to a span and energy of the frequency band to which the howling event belongs; and reducing the amplitude gain of the frequency band to which the howling event belongs according to the gain change amount.

7 . The howling suppression method of claim 6 , further comprising: after reducing the amplitude gain of the frequency band to which the howling event belongs according to the gain change amount, extending a preset duration; and
determining whether a howling event occurs at the current moment, if a howling event occurs, reducing the gain change amount by a preset value to obtain a new gain change amount, and reducing the amplitude gain of the frequency band to which the howling event belongs according to the new gain change amount.

8 . An in-ear earphone comprising a microphone, a speaker, a memory and a processor, wherein a computer program is stored in the memory, and when the computer program in the memory is executed by the processor, steps of the howling suppression method of claim 1 are implemented.

9 . A storage medium, in which computer executable instructions are stored, wherein when the computer executable instructions are loaded and executed by a processor, steps of the howling suppression method of claim 1 are implemented.

10 . A howling suppression apparatus comprising:
a howling detecting module configured to determine whether a howling event occurs according to an audio signal collected by a microphone; a howling type determining module configured to determine a howling type corresponding to the howling event if a howling event occurs; a signal adjustment module configured to reduce an amplitude gain of a frequency band to which the howling event belongs if the howling type is impulse wave howling, and perform a filtering process on the audio signal the amplitude gain reduction of which is reduced, to obtain a target audio signal; and an audio playback module configured to control a speaker to play the target audio signal.

Assignees

• Goertek Tech Co Ltd

Inventors

• Ding Zhihui
• Xu Guojun

Classifications

• H04R2430/01

  Aspects of volume control, not necessarily automatic, in sound systems · CPC title

• H04R29/001

  for loudspeakers (H04R29/007 takes precedence) · CPC title

• H04R3/04

  for correcting frequency response · CPC title

• H04R1/1041

  Mechanical or electronic switches, or control elements (switches in general H01H) · CPC title

• H04R25/00

  Electric hearing aids · CPC title