| 摘要 |
An apparatus for quantizing the phase of a speech signal using a perceptual weighting function and a method therefor are provided. The apparatus for quantizing the phase of a speech signal using a perceptual weighting function includes a phase information extractor for obtaining the phase of each harmonic frequency in a speech signal represented by the discrete sum of periodic signals having different harmonic frequency components, a quantization noise shaping unit for controlling the amount of quantization noise of each phase using a perceptual weighting function, which makes quantization noise less than a predetermined just noticeable difference (JND) of the phase, a quantization bit assigner for assigning quantization bits to each phase according to the controlled amount of quantization noise, and a scalar quantizer for quantizing each phase by the assigned quantization bits. It is possible to improve the quality of encoded speech by quantizing phase information using a perceptual weighting function. |
