| 摘要 |
PURPOSE:To provide the high-compression, small-throughput sound signal encoding device which improves the quality of a speech by making a quantization noise generated in encoding hard to hear by utilizing auditory masking characteristics as to a device which compresses and encodes a sound signal. CONSTITUTION:This device is equipped with a power spectrum calculation part 111 which finds the power spectrum of the sound signal, a masking characteristic calculation part 112 which finds auditory masking spectrum characteristics, a finite impulse response filter 107 which has power spectrum spectrum characteristics reverse to those of the sound signal, and all polarity type infinite impulse response filters 104 and 109 which have spectrum characteristics generated by dividing the power spectrum characteristics of the sound signal by the auditory masking spectrum characteristics; and an auditory weighting process is performed by the finite impulse response filter and all-polarity type infinite impulse response filters. |
