Sound source direction estimation apparatus, sound source direction estimation method and computer program product

摘要

According to an embodiment, a sound source direction estimation apparatus includes an acquisition unit, a generator, a comparator, and an estimator. The acquisition unit is configured to acquire acoustic signals of a plurality of channels from a plurality of microphones. The generator is configured to calculate a phase difference of the acoustic signals of the plurality of channels for each predetermined frequency bin to generate a phase difference distribution. The comparator is configured to compare the phase difference distribution with a template generated in advance for each direction, and calculate a score in accordance with similarity between the phase difference distribution and the template for each direction. The estimator is configured to estimate a direction of a sound source based on the scores calculated.

主权项

1. A sound source direction estimation apparatus comprising:
circuitry configured to implement: an acquisition unit configured to acquire acoustic signals of a plurality of channels from a plurality of microphones; a generator configured to calculate a phase difference of the acoustic signals of the plurality of channels for each predetermined frequency bin to generate a phase difference distribution; a comparator configured to compare the phase difference distribution with a template generated in advance for each direction, and calculate a score in accordance with similarity between the phase difference distribution and the template for each direction so that the score for a direction corresponding to the template becomes higher as the similarity between the phase difference distribution and the template is higher; and an estimator configured to estimate a direction of a sound source based on the calculated score, wherein the comparator includes:
a quantizer configured to perform a quantization on the phase difference distribution; anda score calculator configured to compare the quantized phase difference distribution with the template obtained by performing the quantization on a phase difference distribution calculated in advance for each direction, and calculate as the score the number of frequency bins where quantized phase differences in the phase difference distribution and in the template are identical.