嵌入编码技术在数字数据传输系统中的应用

Embedded Coding Technology and Application in Data Transmission

本文介绍了嵌入编码技术的基本原理,指出在差分脉码调制(DPCM)系统中引入嵌入编码技术,可以减少分配给语音传输的比特数,代之以传输数据信息,且不会因此显著影响重建语音信号质量。本文最后给出将嵌入编码技术用于传输速率为32kb/s的自适应差分脉码调制(ADPCM)系统的实验结果,证明采用此系统不仅能提高数字通信系统的频带利用率,而且在32kb/s传输速率的信道中能同时传送24kb/s语音+8kb/s数据信号或者16kb/s语音十16kb/s数据信号而不导致重建语音质量的恶化。

The basic principle of embedded coding technology is presented. With minor modifications to the encoder and decoder, DPCM becomes an embedded code and allow reduction of the least significant bits assigned to speech transmission to accommodate data transmission within the bit stream without significant degradation of speech quality on the receiving side. Combined the embedded codibg technogy with G. 721 algorithm (32k bit /s Adaptive DPCM) produces embedded ADPCM,it allows the insertion of an auxiliary data channel of 8 or 16kbit/s,multiplexed together with the speech channel of 24kbit/s or 16kbit/s to form the complete 32kbit/s signal without causing mistracking operation in the decoder.