| 摘要 |
PROBLEM TO BE SOLVED: To enable performing optimum volume compensation for various different acoustic input by reading a detected noise level and compensation quantity corresponding to a kind of a discriminated acoustic input source from a noise data control database, and compensating an acoustic input signal. SOLUTION: On DSP side, noise level is detected (S11), and the noise level data are transmitted to a microcomputer side (S12). correction data corresponding to a kind (for each sound range) of an input source and a noise step are received (S13), and an acoustic input signal is arithmetically processed with compensation quantity corresponding to the correction data (S14). The corrected acoustic signal is outputted to an electronic volume (S15). On microcomputer side, the kind of input source is confirmed (S21), and the noise level is received and is assigned to an appropriate step (S22). Correction quantity corresponding to the kind of noise level and the noise step are read out from a correction table (S23), and the corrected data corresponding to the kind on input source and the noise step are transmitted to the DSP (S24).
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