| 摘要 |
PURPOSE:To provide a sound field control system capable of generating a reflection sound and a reverberation sound more naturally and smooth than as usual. CONSTITUTION:In the sound field control system in a digital audio system, feeding back a delay output of an FIR filter to an input side and generating the reflection sound or the reverberation sound, plural frequency characteristic correction filters FIL1, FIL2, FIL3 are provided in a system to be the loop of feedback. The plural frequency characteristic correction filters are set to frequency characteristics different from each other. Further, respective delay times between the frequency characteristic correction filters are set to nearly the same time. Further, cutoff frequencies fn of respective filters between the frequency characteristic correction filters are set to be in the relation of fn= fminX(fmax/fmin)<n/k> (n=0, 1,<, the number of filters-1; fmin and fmin and fmax are a minimum value and a maximum value among respective cutoff frequencies). |
