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首页> 外文会议>European Conference on Speech Communication and Technology v.3; 20010903-20010907; Aalborg; DK >A Variable Rate Hybrid Coder Based on a Synchronized Harmonic Excitation
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A Variable Rate Hybrid Coder Based on a Synchronized Harmonic Excitation

机译：基于同步谐波激励的可变速率混合编码器

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摘要

A novel synchronization technique is proposed for hybrid coders employing harmonic and waveform coding. A new classification technique based on analysis by synthesis to distinguish between stationary and transitional segments is also proposed. Harmonic excitation is synchronized with the LPC residual by transmitting the location of the pitch pulse closest to the frame boundary and a phase value that represents the shape of the corresponding pitch pulse. A hybrid coder is designed to demonstrate the new techniques, which has three modes: scaled white noise excitation colored by LPC for unvoiced, ACELP for transitions, and harmonic excitation for stationary segments. Subjective listening tests show that the speech quality of the variable rate hybrid coder outperforms the quality of ITU G.723.1 coders, at maximum bit rates lower than those of G.723.1 coders.
机译：针对采用谐波和波形编码的混合编码器，提出了一种新颖的同步技术。还提出了一种新的基于综合分析的分类技术，用以区分平稳段和过渡段。通过发送最接近帧边界的基音脉冲的位置和代表相应基音脉冲形状的相位值，可以使谐波激励与LPC残留同步。设计了一种混合编码器以演示新技术，它具有三种模式：LPC为无声着色的标度白噪声激励，过渡的ACELP以及固定段的谐波激励。主观听觉测试表明，可变速率混合编码器的语音质量优于ITU G.723.1编码器的质量，最大比特率低于G.723.1编码器。

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