Stereo Signal Generating Apparatus and Stereo Signal Generating Method

摘要

A stereo signal generating apparatus capable of obtaining stereo signals that exhibit a low bit rate and an excellent reproducibility. In this stereo signal generating apparatus ( 90 ), an FT part ( 901 ) converts a monaural signal (M'_t) of time domain to a monaural signal (M') of frequency domain. A power spectrum calculating part ( 902 ) determines a power spectrum (P_M'). A scaling ratio calculating part ( 904 a) determines a scaling ratio (S_L) for a left channel, while a scaling ratio calculating part (904b) determines a scaling ratio (S_R) for a right channel. A multiplying part ( 905 a) multiplies the monaural signal (M') of frequency domain by the scaling ratio (S_L) to produce a left channel signal (L'') of a stereo signal, while a multiplying part ( 905 b) multiplies themonaural signal (M')of frequency domain by the scaling ratio (S_R) to produce a right channel signal (R'') of the stereo signal.