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

Claim 14:
15. An audio playback system, outputting an anti-phase noise audio signal according to an anti-phase noise signal, wherein the audio playback system comprises:
an error microphone receiving an environmental noise and the anti-phase noise audio signal, to generate an error signal; and
an adaptive active noise cancellation apparatus, comprising:
an automatic noise shaping circuit receiving the error signal, shaping an interference signal to a shaped interference signal and 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, 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.