Patent ID: 11922919
Assignee: TELINK SEMICONDUCTOR (SHANGHAI) CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 7:
8. An apparatus for noise reduction, applicable to a headset provided with a noise reduction function, comprising:
a first acquiring module configured to acquire a first reference noise signal;
a second acquiring module configured to acquire an initial direction of desired speech in response to a trigger signal;
a third acquiring module configured to acquire a real-time direction of desired speech based on a real-time orientation of the headset and the initial direction of desired speech, the real-time orientation being obtained by orientation tracking for the headset;
a first filtering module configured to filter out the desired speech signal from the first reference noise signal to acquire an undesired noise signal, the desired speech signal being extracted in the real-time direction of desired speech; and
a second filtering module configured to filter the undesired noise signal to output an inverse noise signal for speaker playback,
wherein the first filtering module is configured to:
control a beamformer to pick up a second reference noise signal along the real-time direction of desired speech;
filter components with frequencies exceeding a preset frequency range out of the second reference noise signal to obtain a retained signal;
eigen-decompose, with a principal component analysis algorithm, the retained signal to acquire N eigenvalues Di (i=1, 2, . . . , N) and corresponding N sets of singular vectors Ui and Vi, wherein N refers to the number of microphones configured for the beamformer; and
select at least one eigenvalue Dj greater than a preset eigenvalue to calculate the desired speech signal S=ΣUj*Dj*Vj.