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US 2021/0243525 A1Published application
Method and apparatus for attenuation of audio howling
AssigneeContinental Automotive Systems, Inc.
InventorMike Reuter
Life of this patent
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Abstract
Regions of the audio frequency spectrum that are most susceptible to howling are identified or determined. When detected, these approaches shape the frequency spectrum of the audio going to loudspeakers so that only those howling frequencies are suppressed.
Claims18
A system for attenuating howling at a speaker, the system comprising:
- an audio speaker;
- a microphone;
- a control circuit coupled to the audio speaker and the microphone, the control circuit configured to:
- create an estimate of an echo path signal based upon an input to the audio speaker and an output of the microphone;
- dynamically generate an acoustic filter according to selected ones of a plurality of frequencies in the estimate of the echo path signal, wherein each of the selected ones of the plurality of frequencies have respective modeled channel frequency response magnitudes greater than unity and corresponding respective channel mask magnitude values that are correspondingly less than unity;
- convert an analog microphone signal received at the microphone to a digital microphone signal;
- apply the digital microphone signal to the acoustic filter creating an attenuated digital signal, the attenuated digital signal including an attenuation of the echo path signal by the corresponding respective channel mask magnitude values only at the selected ones of the plurality of frequencies thereby preventing audio howling at the selected ones of the plurality of frequencies;
- convert the attenuated digital signal to an attenuated analog signal;
- wherein the audio speaker renders the attenuated analog signal to a user.
6 more elements
A method for attenuating howling at a speaker, the method comprising:
- providing an audio speaker, a microphone, and a control circuit;
- by the control circuit:
- creating an estimate of an echo path signal based upon an input to the audio speaker and an output of the microphone;
- dynamically generating an acoustic filter according to selected ones of a plurality of frequencies in the estimate of the echo path signal, wherein each of the selected ones of the plurality of frequencies have respective modeled channel frequency response magnitudes greater than unity and corresponding respective channel mask magnitude values that are correspondingly less than unity;
- converting an analog microphone signal received at the microphone to a digital microphone signal;
- applying the digital microphone signal to the acoustic filter creating an attenuated digital signal, the attenuated digital signal including an attenuation of the echo path signal by the corresponding respective channel mask magnitude values only at the selected ones of the plurality of frequencies thereby preventing audio howling at the selected ones of the plurality of frequencies;
- converting the attenuated digital signal to an attenuated analog signal;
- wherein the audio speaker renders the attenuated analog signal to a user.
5 more elements
Dependencies are inferred from the claim text.