Phase quantization method and apparatus

摘要

A phase quantization method and apparatus in which the phase information of the input signal such as at the time of the sinusoidal synthesis encoding can be quantized efficiently. The phase of the input signal derived from speech signals from an input terminal 11 is found by a phase detection unit 12 and scalar-quantized by a scalar quantizer 13. The spectral amplitude weighting k of each harmonics is calculated by a weighting calculation unit 18 based on the LPC coefficients from a terminal 17. Using the weighting k, a bit allocation calculation unit 19 calculates an optimum number of quantization bits of respective harmonics to send the calculated optimum number to the scalar quantizer 13.