| 摘要 |
The invention concerns a speech-encoding method using analysis-by-synthesis techniques. The speech signal is scanned, a frame formed from a predetermined number of scanning samples, and the coefficients of a grade P speech-synthesis filter determined from the samples in each frame. Using these coefficients, a number P of so-called line-spectrum parameters (LSPs) are determined and quantized, for transmission over a channel with limited transmission capacity. The method is characterized in that every other line-spectrum parameter (LSP) is quantized in scalar (absolute) fashion and that the line spectrum parameters (LSPs) lying between them are transformed (normalized) before quantization. The invention is intended particularly for use in speech-encoding equipment in portable radio equipment. |
