On the perceptual weighting function for phase quantization of speech

This paper addresses the issue on the utilization of the perceptual characteristics of the human auditory system for the phase quantization of speech signals. Taking into account the phase quantization noise, we propose the perceptual weighting function to make the quantization noise below the threshold of human perception. The weighting function is derived from psychoacoustic experiments in which the just noticeable difference (JND) of phase is measured for the zero-phase, flat-spectrum periodic tones. Preliminary experimental results on vowels of speech signals demonstrate that the proposed weighting is very effective for the quantization of phase information.