Patent ID: 11863948
Assignee: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 19:
20. An apparatus comprising:
a first microphone to receive a first sound signal, wherein:
the first sound signal includes a first noise sound component and a second noise sound component;
the first noise sound component is localized noise; and
the second noise sound component is ambient noise;

a classifier, coupled to the input, to classify, into an acoustic signal classification, a relationship between the first and second noise sound components, wherein the acoustic signal classification is selected from at least three classification values representing the relationship between the first and second noise sound components;
a signal processor, coupled to the classifier, to:
process the first sound signal in accordance with the acoustic signal classification to modify the received first sound signal using a transfer function that increases attenuation of the localized noise when the localized noise is classified as increasing relative to the ambient noise and decreases attenuation of the localized noise when the localized noise is classified as decreasing relative to the ambient noise, wherein the only sound signal processed to classify the localized noise is the first sound signal received from the first microphone; and
generate an anti-noise signal using the processed first sound signal and the transfer function; and

an output, coupled to the signal processor, to provide at least the anti-noise signal to a speaker.