Patent ID: 11875772
Assignee: AIROHA TECHNOLOGY CORP.
Field: Other consumer goods (Other fields)
Classification: CPC G | IPC G

Claim 0:
1. An adaptive active noise control (ANC) system comprising:
an ANC circuit, arranged to generate an anti-noise signal, wherein the ANC circuit comprises at least one adaptive filter; and
a control circuit, arranged to receive a first input signal derived from a reference signal output by a reference microphone that picks up ambient noise, receive a second input signal derived from an error signal output by an error microphone that picks up remnant noise resulting from noise reduction, and perform a comparison operation based on a first characteristic value of the first input signal and a second characteristic value of the second input signal to control the at least one adaptive filter, wherein the control circuit comprises:
a filter, arranged to process the anti-noise signal output from the at least one adaptive filter to generate a filtered anti-noise signal; and
a combining circuit, arranged to combine the filtered anti-noise signal and the error signal to generate the second input signal.