Patent ID: 11922933
Assignee: YAMAHA CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 5:
6. A voice processing device comprising:
a first microphone that collects a first audio signal from a sound source;
a second microphone that collects a second audio signal from the sound source;
a memory storing instructions; and
a processor that implements the stored instructions to execute a plurality of tasks including:
a voice estimating task that estimates probability of an audio signal collected by the first microphone including a person's voice;
a probability value setting task that sets a probability value to:
a first probability value indicative of the first audio signal including a person's voice; and
a second probability value of zero indicative of the first audio signal not including a person's voice;

a correlation value estimating task that estimates a correlation value of the first audio signal and the second audio signal;
a time-difference obtaining task that obtains a time difference between waveforms of the first audio signal and the second audio signal based on the estimated correlation value;
a voice determining task that determines that the first audio signal:
includes a person's voice, in a state where the time difference is greater than a predetermined value; and
does not include a person's voice, in a state where the time difference is not greater than the predetermined value;

a gain determining task that determines a gain of the first audio signal to be:
from among a range of greater than zero and less than one, in a state where the first probability value is set and the time difference is greater than the predetermined value; and
zero, in a state where the time difference is not greater than the predetermined value;

a signal processing task that processes the first audio signal based on the determined gain of the first audio signal to improve an audio quality at a far-end side; and
a sending task that sends the processed audio signal to the far-end side, where a voice processing device located at the far-end side reproduces the received processed audio signal to emit sound from a speaker.