Sound signal processing device, method, and program

摘要

There is provided a sound signal processing device, in which an observation signal analysis unit receives multi-channels of sound-signals acquired by a sound-signal input unit and estimates a sound direction and a sound segment of a target sound to be extracted and a sound source extraction unit receives the sound direction and the sound segment of the target sound and extracts a sound-signal of the target sound. By applying short-time Fourier transform to the incoming multi-channel sound-signals this device generates an observation signal in the time-frequency domain and detects the sound direction and the sound segment of the target sound. Further, based on the sound direction and the sound segment of the target sound, this device generates a reference signal corresponding to a time envelope indicating changes of the target's sound volume in the time direction, and extracts the signal of the target sound, utilizing the reference signal.

主权项

1. A sound signal processing device comprising:
one or more processors configured 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; andextract a sound signal of the target sound by utilizing the reference signal.