| 摘要 |
PURPOSE:To obtain a good sentence intelligibility even in case of encoding with a low bit rate by dividing the time series of spectrum parameters, which are extracted in frame units of an input voice, to segments each of which consists of plural frames and encoding them. CONSTITUTION:The voice input from a terminal 11 passes an LPF12 and is sampled periodically and is converted to a digital signal by an A/D converter 13 and is inputted to an LPC analyzing part 14. In the analyzing part 14, the spectrum parameter time series of the input voice is calculated in frame units and is divided to segments on a basis of the change rate of the spectrum by a segmentation part 15, and segments are resampled by a means 16 so that the number of samples of the parameter time series in each segment is fixed. Resampled segments are matched with standard pattern from a memory 23 in segment unit by a matrix quantizing part 22, and the standard pattern approximating most the segment is outputted, and this pattern and a signal quantized by a quantizing part 27 are synthesized by a multiplexer 26, and this voice code output is restored in an LPC synthesizing part 36 and is subjected to D/A conversion by a D/A converter 37 and is outputted through an LPF38. |
