Sound signal processing device, method, and program

A sound signal processing method performed in a sound signal processing device, the method comprising:

• receiving a plurality of sound signals from a plurality of microphones mounted at different positions, to estimate a sound direction and a sound segment of a target sound to be extracted;
• applying a short-time Fourier transform on the plurality of sound signals to generate an observation signal in a time-frequency domain,
• wherein the sound direction and the sound segment of the target sound is estimated based on the observation signal;
• generating a reference signal which corresponds to a time envelope denoting changes of sound volume of the target sound in a time direction based on the sound direction and the sound segment of the target sound, wherein the time envelope is generated based on a phase difference between the plurality of microphones;
• and
• extracting a sound signal of the target sound by utilizing the reference signal.

A non-transitory computer-readable medium having computer-executable instructions stored thereon, the instructions, when executed by one or more processors, causing the one or more processors to:

• receive a plurality of sound signals from a plurality of microphones mounted at different positions, to estimate a sound direction and a sound segment of a target sound to be extracted;
• apply a short-time Fourier transform on the plurality of sound signals to generate an observation signal in a time-frequency domain,
• wherein the sound direction and the sound segment of the target sound is estimated based on the observation signal;
• generate a reference signal which corresponds to a time envelope denoting changes of sound volume of the target sound in a time direction based on the sound direction and the sound segment of the target sound, wherein the time envelope is generated based on a phase difference between the plurality of microphones;
• and
• extract a sound signal of the target sound by utilizing the reference signal.