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

Claim 0:
1. A method of noise reduction, applicable to a headset provided with a noise reduction function, comprising:
acquiring a first reference noise signal;
acquiring an initial direction of desired speech in response to a trigger signal;
acquiring 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;
filtering out a 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
filtering the undesired noise signal to output an inverse noise signal for speaker playback,
wherein extracting the desired speech signal in the real-time direction of desired speech comprises:
controlling a beamformer to pick up a second reference noise signal along the real-time direction of desired speech;
filtering components with frequencies exceeding a preset frequency range out of the second reference noise signal to obtain a retained signal;
eigen-decomposing, 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
selecting at least one eigenvalue Dj greater than a preset eigenvalue to calculate the desired speech signal S=ΣUj*Dj*Vj.