Patent ID: 11955108
Assignee: AIROHA TECHNOLOGY CORP.
Field: Other consumer goods (Other fields)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An adaptive active noise cancellation apparatus, adapted for an audio playback system, wherein the audio playback system is for outputting an anti-phase noise audio signal according to an anti-phase noise signal, wherein the audio playback system comprises an error microphone for receiving an environmental noise and the anti-phase noise audio signal to generate an error signal, wherein the adaptive active noise cancellation apparatus comprises:
an automatic noise shaping circuit receiving the error signal, shaping an interference signal to a shaped interference signal and shaping the error signal to a shaped error signal according to a preset noise shape, and outputting the shaped interference signal and the shaped error signal;
an adaptive active noise filtering unit receiving the interference signal, outputting the anti-phase noise signal for generating the anti-phase noise audio signal;
a first transmission channel simulation unit receiving the shaped interference signal for generating a simulated shaped interference signal according to a channel transfer function; and
a coefficient adjustment unit receiving the simulated shaped interference signal and the shaped error signal, and adjusting a filter coefficient of the adaptive active noise filtering unit by an adaptive algorithm according to the simulated shaped interference signal and the shaped error signal.