Audible howling control systems and methods
AssigneeGM Global Technology Operations LLC
InventorAmos Schreibman
Life of this patent
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Abstract
An audio system includes: a speaker; a microphone that generates a microphone signal based on sound output from the speaker; a mixer module configured to generate a mixed signal by mixing the microphone signal with an audio signal; a filter module configured to filter the mixed signal to produce a filtered signal and to apply the filtered signal to the speaker; and a detector module configured to determine a howling frequency in the microphone signal attributable to sound output from the speaker, where the filter module is configured to decrease a magnitude of the filtered signal at the howling frequency.
Claims18
An audio system comprising:
- a speaker;
- a microphone that generates a microphone signal based on sound output from the speaker;
- a mixer module configured to generate a mixed signal by mixing the microphone signal with an audio signal;
- a filter module configured to filter the mixed signal to produce a filtered signal and to apply the filtered signal to the speaker;
- and
- a detector module configured to determine a howling frequency in the microphone signal attributable to sound output from the speaker,
- wherein the filter module is configured to decrease a magnitude of the mixed signal at the howling frequency, and
- wherein the detector module is configured to determine the howling frequency based on a comparison of the filtered signal applied to the speaker at a first time and the microphone signal at a second time that is after the first time.
An audio system comprising:
- a speaker;
- a microphone that generates a microphone signal based on sound output from the speaker;
- a mixer module configured to generate a mixed signal by mixing the microphone signal with an audio signal;
- a filter module configured to filter the mixed signal to produce a filtered signal and to apply the filtered signal to the speaker;
- a detector module configured to determine a howling frequency in the microphone signal attributable to sound output from the speaker,
- wherein the filter module is configured to decrease a magnitude of the mixed signal at the howling frequency;
- and
- a power spectral density (PSD) module configured to determine a PSD based on the microphone signal,
- wherein the detector module is configured to determine the howling frequency based on the PSD.
A method comprising:
- by a microphone, generating a microphone signal based on sound output from a speaker;
- generating a mixed signal by mixing the microphone signal with an audio signal;
- filtering the mixed signal to produce a filtered signal;
- applying the filtered signal to the speaker;
- and
- determining a howling frequency in the microphone signal attributable to sound output from the speaker,
- wherein determining the howling frequency includes determining the howling frequency based on a comparison of the filtered signal applied to the speaker at a first time and the microphone signal at a second time that is after the first time;
- and
- decreasing a magnitude of the mixed signal at the howling frequency.
Dependencies are inferred from the claim text.