Techniques for howling detection
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsPablo PESO PARADA, Rahim SAEIDI, John L. MELANSON
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Abstract
The application describes techniques for howling detection. A processing module for a noise control circuit is described. The processing module comprises a howling detector configured to receive an input signal and to determine a log-linearity metric based on the input signal. Gain adjustment of the noise control unit following the detection of howling is also described, wherein the amount of gain adjustment may be based on an estimation of the maximum stable gain of the noise control unit.
Claims21
A processing module for a noise control circuit, the processing module comprising:
- a howling detector configured to receive an input signal and to determine a linearity metric based on the input signal, the linearity metric comprising a measure of the linearity of a logarithmic representation of the energy of the input signal;
- and
- a gain adjuster configured to adjust the gain of a noise control unit.
A processing circuit for a noise control module comprising:
- a gain adjustment mechanism configured to adjust the gain of a noise control circuit if a plot of the energy of an input signal in the log domain becomes linear or tends towards linearity.
21-22. (canceled)
Dependencies are inferred from the claim text.