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

Claim 37:
38. A mobile communication device comprising:
a 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;

an active noise cancellation system, coupled to the microphone, comprising:
a classifier to classify, into an acoustic signal classification, a relationship between the first and second sound components, wherein the acoustic signal classification is selected from at least three classification values representing the relationship between the first and second 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 detected 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

a speaker, coupled to the active noise cancellation system, to receive the anti-noise signal and generate sound that corresponds to at least the anti-noise signal.