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

Claim 16:
17. A system of noise suppression for a personal sound amplification product (PSAP), comprising:
a memory storing code; and
a processor coupled to the memory, wherein when the code is executed, the processor is configured to:
receive a set of first sub-band signals in a set of first sub-bands, wherein the set of first sub-band signals is generated from an environmental audio signal acquired through one or more microphones;
receive a set of second sub-band signals in a set of second sub-bands, wherein the set of second sub-band signals is also generated from the environmental audio signal;
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; and
provide the set of first gains to process the set of first sub-band signals so that a noise-suppressed audio signal is generated from the set of first sub-band signals,

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 to 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, the processor is further configured to:
for each first sub-band,
determine, from the set of second sub-bands, one or more second sub-bands included within the first sub-band;
determine, from the set of second gains, one or more second gains in the one or more second sub-bands, respectively; and
determine a first gain in the first sub-band based on the one or more second gains; and

wherein to determine the first gain in the first sub-band based on the one or more second gains, the processor is further configured to:
determine the first gain to be a maximal gain among the one or more second gains.