线谱对参数的一步插值预测矢量量化

One-step interpolation predictive vector quantization of lsp parameters

利用语音短时谱变化相对较慢、其邻近ＬＳＰ（ＬｉｎｅＳｐｅｃｔｒｕｍＰａｉｒ）失量存在充分相关这一特性，提出了一种新的谱编码方法，即ＬＳＰ编码的一步插值预测矢量量化。本文设计了一个１８ｂｉｔ／ｆｒａｍｅ分裂矢量量化方案用于量化预测残差，当帧变化周期为３０ｍｓ时，平均谱失真仅为１．１７８ｄＢ。

Taking advantage of the sufficident correlation of successive LSP(Line Spectrum Pair)vectors because of relatively slow variation of the short term spectrum of the speech waveform,a new spectral coding approach,one-step interpolation predictive vector quantization of LSP codingis pro-posed.18 bit/frame split vector quantization scheme is designed to quan-tize the prediction residual.The average spectral distortion of 1.178 dB can be achieved when frame period is 30 ms.