Ntt Corporation

Keisuke Kinoshita

Hiroshi Sawada

Rintaro Ikeshita

Shoko Araki

Tomohiro Nakatani

Naoyuki Kamo

An acoustic signal enhancement device includes: a spatiotemporal covariance matrix estimation unitconfigured to estimate spatiotemporal covariance matrices Rand P; a reverberation suppression unitconfigured to obtain a reverberation suppression filter Gof the sound source j using the estimated spatiotemporal covariance matrices Rand Pfor each sound source j and to generate a reverberation suppression signal vector using the obtained reverberation suppression filter Gand the observation signal vector X; a sound source separation unitconfigured to obtain an enhanced sound yof the sound source j and power of the sound source j using the generated reverberation suppression signal vector for each sound source j (where 1≤j≤J) corresponding to the target sound; and a control unitconfigured to perform control such that processes of these units are repeatedly performed.

Acoustic signal enhancement apparatus, method and program

There is provided an acoustic signal enhancement device that receives, as an input, a recording sound obtained by frequency division and updates parameters, the device including: assuming that a switch weight is a weight indicating a ratio of a classification to which a recording sound at each timing belongs in classifications of spatial states where a recording sound temporally changes, a beamformer unit that performs beamformer processing based on a weighted spatial covariance matrix which is updated and updates an auxiliary estimation value of a target sound; a switch unit that updates the switch weight and power of a target sound based on the updated auxiliary estimation value and outputs an estimation value of the target sound; and a weighted spatial covariance estimation unit that updates the weighted spatial covariance matrix based on the updated switch weight and the power.

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Tokyo, Japan

Keisuke Kinoshita