Patent ID: 11930333
Assignee: BESTECHNIC (SHANGHAI) CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 9:
10. A personal sound amplification product (HAP), comprising:
one or more microphones configured to acquire an environmental audio signal;
a first filter set configured to process the environmental audio signal to generate a set of first sub-band signals in a set of first sub-bands;
a second filter set configured to process the environmental audio signal to generate a set of second sub-band signals in a set of second sub-bands;
a processor configured to determine a set of first gains for the set of first sub-band signals in the set of first sub-bands based on the set of second sub-band signals in the set of second sub-bands;
a set of gain control units configured to process the set of first sub-band signals based on the set of first gains, respectively; and
a third filter set configured to synthesize the set of first sub-band signals to generate a noise-suppressed audio signal,
wherein to determine the set of first gains, the processor is further configured to:
determine a set of speech presence probabilities associated with the set of second sub-band signals, respectively;
determine a set of second gains in the set of second sub-bands based on the set of speech presence probabilities, respectively; and
determine the set of first gains in the set of first sub-bands based on the set of second gains in the set of second sub-bands;

wherein the set of speech presence probabilities comprises a set of posterior speech presence probabilities associated with the set of second sub-band signals; and
wherein to determine the set of speech presence probabilities associated with the set of second sub-band signals, respectively, the processor is further configured to:
for each second sub-band signal in a corresponding second sub-band,
determine a prior speech presence probability and a prior signal-to-noise ratio (SNR) associated with the second sub-band signal;
determine an intermediate variable determined based on the prior speech presence probability and the prior SNR; and
determine a posterior speech presence probability associated with the second sub-band signal based on the prior speech presence probability, the prior SNR, and the intermediate variable.