Techniques of Very Low Bit-Rate Speech Coding<em>1</em>

• 作者: CUIHuijuan TANGKun ZHANGXin ZHAOMing
• 来源期刊: 电子学报(英文版)
• 学科: 工学
• 关键词: 语音编码 低比特速率 多帧 声码器 线性预测 向量量化
• 年，卷（期）: 2004,（1）
• 页码范围: 63-65
• 页数: 3页
• 分类号: TN912.32
• 语种: 中文

摘要

Techniques of very low bit-rate speech coding,such as lower than 800 bps are presented in this paper. The techniques of multi-frame, multi-sub-band, multimodel, and vector quantization etc. are effective to decrease the bit-rate of vocoders based on a linear prediction model. These techniques bring the vocoder not only high quality of the reconstructed speech, but also robustness.Vocoders which apply those techniques can synthesize clear and intelligent speech with some naturalness. The mean DRT (Diagnostic rhyme test) score of an 800 bps vocoder is 89.2%and 86.3%for a 600 bps vocoder.