ACOUSTIC SIGNAL PROCESSING DEVICE AND ACOUSTIC SIGNAL PROCESSING METHOD

摘要

There is provided an acoustic signal processing device capable of reducing the calculation amount of the matrix calculation. The acoustic signal processing device (24) converts an acoustic signal down-mixed into NI channels into an acoustic signal of NO (NO > NI) channels. The acoustic signal processing device (24) includes: a first matrix calculation unit (241) for calculating a matrix of K (NO > K = NI) rows and NI columns for the acoustic signal down-mixed into the NI channels and outputting K signals subjected to the matrix calculation; K pieces of decorrelation units (242, 243) for generating a signal incoherent to the signal subjected to the matrix calculation for the time characteristic while maintaining the frequency characteristic of the signal subjected to the matrix calculation; and a second matrix calculation unit (244) for performing matrix calculation of NO rows and (NI+K) columns for the acoustic signal down-mixed into the NI channels and the K incoherent signals and outputting acoustic signals of NO channels.