说明：  G.729的编码实现其中的代数结构码采用交织单脉冲转换技术。码本中的每一个码字都仅仅只有少数几个位置的脉冲不为零。
(G.729 encoding to achieve one of the algebraic structure of code interleaved single-pulse conversion technology. Codebook in each codeword are only a few locations only non-zero pulse.)