VOICE CODING DEVICE

摘要

PROBLEM TO BE SOLVED: To improve quality of a reproduction by performing a bit assignment efficiently while utilizing a continuity time masking effect in a voice coding device reducing the redundancy included in voice and audio signals. SOLUTION: The compensation quantity of a masking threshold value is calculated by a simultaneous masking compensating means 13 and a continuity time masking compensating means 14 based on information of a spectrum envelope calculating means 11 and a power calculating means 12 and a masking threshold value 15a in which maskings of front and rear frames are concidered is finally determined in a masking threshold determining circuit 15 and after the assigning of a bit quantity is adaptively performed according to power of the value 16a obtained by dividing the spectra information 11a calculated in the spectrum envelope calculating meas 11 by the masking threshold value and then the quantization of a spectrum parameter is performed.