一种适用于低速率语音编码系统的基音周期量化算法  

A Pitch Quantization Method for Low Bit-rate Speech Coding

作　　者：朱文育[1] 郭莉[1] 王炳锡[1] 

机构地区：[1]解放军信息工程大学,郑州450002

出　　处：《信号处理》2005年第3期271-274,共4页Journal of Signal Processing

摘　　要：本文提出了一种适用于低速率语音编码系统的基音周期量化算法。该量化器由一个无记忆均匀量化器和一个差分量化器组成。其中,一个量化器直接量化对数基音周期,另外一个量化器对当前的待量化的对数基音周期与前一个已量化的对数基音周期的差分值进行量化。两个量化器的输出结果择优传送到解码器。该方法利用语音信号中的冗余特性和人耳的听觉特性获得了一个高效的量化算法。实验结果表明,该算法对基音周期的量化只用4比特而不降低合成信号的听觉质量。This paper proposed a pitch quantization method for low bit-rate speech coding systems. The quantizer is composed of a memoryless uniform quantizer and a differencial quantizer. One quantizer working directly on logarithmic pitch values and the other working on the diferencial between the current and previous logarithmic pitch. The best of the two output values is transmitted to the receiver. This method can exploit both the redundancy in the speech signal and the properties of ear to achieve an efficient quantization. Experiment results show that the scheme allows the pitch parameter to be quantized using 4 bits, with no degradation in audible quality.

关 键 词：语音编码系统 基音周期 量化算法 低速率 适用 量化器 输出结果 听觉特性 语音信号 合成信号 对数 解码器 差分 人耳 

分 类 号：TN912.34[电子电信—通信与信息系统] TN912.3[电子电信—信息与通信工程]