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为降低在窄带高误码率信道上语音传输的失真,针对基音参数提出了一种解码端抗差错算法。语音信号的基音周期本身变化比较平缓,在解码端将当前语音帧的基音参数与上一帧的基音参数进行比较,若发现变化超过一定范围,则认为是当前帧基音参数出错,并对其进行纠错处理。为了防止由于基音参数的重建错误而引起的误码扩散,若上一帧语音进行过纠错处理,则当前帧语音不作纠错处理,直到下一帧语音再跳入恢复算法。实验结果表明:在1%以上的随机误码率下,采用本文提出的纠错算法后,信道误码引起的声码器基音参数误差能够降低10%以上。
In order to reduce the distortion of speech transmission on narrowband high bit error rate channel, a decoding end-to-end error algorithm is proposed for pitch parameters. The pitch period of the voice signal itself changes more slowly. At the decoding end, the pitch parameter of the current voice frame is compared with the pitch parameter of the previous frame. If it is found that the variation exceeds a certain range, it is considered that the pitch parameter of the current frame is in error and is subjected to Error correction. In order to prevent the error diffusion caused by the reconstruction error of the pitch parameter, if the speech of the previous frame has been subjected to the error correction processing, the speech of the current frame is not processed for error correction until the speech of the next frame jumps into the restoration algorithm. Experimental results show that under the random error rate of more than 1%, the error of pitch parameter of vocoder caused by channel error can be reduced by more than 10% with the proposed error correction algorithm.