【摘要】 介绍了TETRA通信系统中信源编解码方案,使用了ACELP(代数码本激励线性预测)这种4.567kbps速率的编码,采用代数码本作为激励,极大的减少了算法延迟。简要分析了TETRA编码器的结构、原理,并且在TI的TMS320C5509芯片上用汇编优化实现了该套算法。更多还原

【Abstract】 The source encoding scheme for speech in TETRA is introduced. By using ACELP whose encoding speed is 4.567kbps,us- ing algebraic codebook, it reduces the lag time of algorithm. TETRA Speech Codec’s structure and principle is analyzed, and the al- gorithm is optimized and worked on the TI Company’s TMS320C5509 DSP.更多还原