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文章介绍了一种全带语音和音频编解码器ITU-T G.719的编码原理和主要特点。G.719在32kbit/s～128 kbit/s的速率上对48 kHz采样的语音和音频信号进行全带(20 Hz～20000 Hz)编解码,编码器基于变换编码,采用自适应时间分辨率、自适应比特分配和低复杂度格型矢量量化等技术。解码器对未编码的频谱成分通过信号自适应噪声填充或带宽扩展方式进行重建。
The article introduces a coding principle and main features of ITU-T G.719, a full-band voice and audio codec. G.719 performs full-band (20 Hz ~ 20000 Hz) encoding and decoding of 48 kHz sampled speech and audio signals at a rate of 32 kbit / s ~ 128 kbit / s. The encoder is based on transform coding and adopts adaptive time resolution, Adaptive bit allocation and low complexity lattice vector quantization techniques. The decoder reconstructs the uncoded spectral components by signal adaptive noise padding or bandwidth expansion.