一种600bps极低速率语音编码算法

该文针对抗干扰通信中对低速率语音编码算法的应用需求，提出了一种600bps极低速率语音编码算法，采用6帧超帧结构，超帧中包括2个基本帧与4个插值帧。插值帧的线性预测(LPC)参数采用基于闭环最优一阶线性预测的4阶段残差矩阵量化；在解码端，提出了闭环的激励脉冲幅度估计方法，提高了合成语音的自然度与鼻音音节的清晰度。该算法可以提供良好的合成语音质量，DRT测试结果达到88.55分。

A Very Low Bit Rate Speech Encoding Algorithm in 600bps

A very low bit rate speech encoding algorithm in 600bps is proposed in this paper for application in anti-jamming communication. Super-frame structure with 2 base frames and 4 interpolate frames is used, the LPC coefficients of interpolate frames is quantized with 4 stages residual matrix quantization based on optimal 1-order linear prediction. In the decoder, a closed loop estimation of the impulse magnitude is proposed to improve the naturalness of speech and the articulation of nasals, This speech coder achieves good quality of speech and the DRT score is 88.55.