Patent ID: 11930331
Assignee: GOERTEK INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A sound signal processing apparatus, comprising:
a signal reception unit configured to receive a first sound signal through a first sound reception apparatus and receive a second sound signal through a second sound reception apparatus respectively; the first sound reception apparatus and the second sound reception apparatus have a corresponding reception delay constant therebetween;
a signal correlation processing unit configured to perform delay processing on the first sound signal at each of a plurality of signal processing times according to the reception delay constant to acquire a signal correlation coefficient between the first sound signal after the delay processing and the second sound signal;
a coherent noise determination unit configured to determine whether the first sound signal and the second sound signal include a coherent noise signal according to the signal correlation coefficient between the first sound signal after the delay processing and the second sound signal;
a coherent noise filtering unit configured to filter out a coherent noise signal from the first sound signal and the second sound signal when determining that the coherent noise signal is included in the first sound signal and the second sound signal to acquire and output a target sound signal at a corresponding signal processing time;
the coherent noise determination unit comprises a detection delay set determination subunit, a coherent detection coefficient set acquisition subunit, and a coherent noise determination unit subunit;
wherein the detection delay set determination subunit is configured to set a detection delay set according to the reception delay constant when the signal correlation coefficient between the first sound signal after the delay processing and the second sound signal is greater than a correlation coefficient threshold;
the coherent detection coefficient set acquisition subunit is configured to perform delay processing on the first sound signal according to the detection delay set to acquire a coherent detection coefficient set between the first sound signal after the delay processing and the second sound signal;
the coherent detection coefficient set includes coherent detection coefficients respectively corresponding to each detection delay in the detection delay set;
the coherent noise determination unit subunit is configured to determine that the first sound signal and the second sound signal include a coherent noise signal when the coherent detection coefficient larger than the signal correlation coefficient exists in the coherent detection coefficient set.