SIGNAL PROCESSING DEVICE

摘要

A signal processing device (1) includes: a generation unit (32) for generating a second signal from a first signal obtained by down-mixing two signals; a mixing coefficient decision unit (40) for deciding the mixing ratio for mixing the first signal and the second signal according to a value L representing the level ratio between the two signals and a value ? representing a phase difference; and a mixing unit (50) for mixing the first signal and the second signal according to the mixing ratio decided by the mixing coefficient decision unit (40). The generation unit (32) includes a first filter (302) for generating a signal of a low-frequency band in the second signal from the signal of a low-frequency band in the first signal and second filter means (treating unit 307) for generating a signal of a high-frequency band in the second signal from the signal of a high-frequency band in the first signal. The first filter (302) is filter means for noncorrelating the input signal by a delay unit (301) and an all-pass filter for the signal of complex number and adding a reverberation component. The treating unit (307) is filter means different from the first filter (302).