| 摘要 |
PROBLEM TO BE SOLVED: To provide an audio signal processing device in which frequency characteristics do not greatly change even when synthesizing a surround signal and a main signal.SOLUTION: An L-R signal is inputted to an APF 14, and an L+R signal is inputted to a BPF 15. Circuit characteristics are set so that a frequency of the APF 14 causing a phase shift of 90 degrees and a center frequency of the BPF 15 have the same value (for example, 1 kHz). The circuit characteristics are set so that the BPF 15 shows substantially the same phase characteristics as that of the APF 14. That is, the circuit characteristics are set, in which the frequency characteristics of the BPF 15 has a gentle and broad pass band and is matched with the phase characteristics of the APF 14, thereby so as to hold phase difference between the APF 14 and the BPF 15 in a whole audible band. |
