Patent ID: 11962968
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Other consumer goods (Other fields)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A noise cancellation apparatus, comprising:
a main control unit (MCU);
a reference microphone;
a speaker;
an error microphone; and
a noise cancellation processing circuit coupled to the MCU, the reference microphone, the speaker, and the error microphone,
wherein the MCU is configured to determine a target noise cancellation parameter from a noise cancellation parameter library based on a received or determined target noise cancellation level index, and the noise cancellation parameter library comprises a correspondence between a noise cancellation level index and a noise cancellation parameter,
wherein the noise cancellation processing circuit is configured to obtain a target inverse phase noise based on the target noise cancellation parameter, and the target inverse phase noise is used to reduce or cancel an ambient noise obtained by the reference microphone, and
wherein the noise cancellation processing circuit is further configured to perform audio mixing processing on a played downlink audio signal and the inverse phase noise to obtain a mixed audio signal, and the mixed audio signal is played by using the speaker,
wherein the MCU or the noise cancellation processing circuit is further configured to determine the target noise cancellation level index based on a matching degree feature value, and the matching degree feature value is used to indicate the matching degree,
wherein the MCU is specifically configured to select the target noise cancellation parameter from the noise cancellation parameter library based on the determined target noise cancellation level index, and
wherein the matching degree feature value is determined by the MCU or the noise cancellation processing circuit based on a relationship between a primary path transfer function (PP) and a secondary path transfer function (SP), the PP is a transfer function from the reference microphone to the error microphone, and the SP is a transfer function from the speaker to the error microphone.