Phase-locked vocoder
Phase-locked vocoder
复制标题
锁相声码器
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
Miller S. Puckette
中科院分区：
文献类型：
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作者：
Miller S. Puckette
相位声码器广泛用于提供高保真的时间拉伸或收缩音频信号，如语音或单声道音乐段落。有两个问题困扰着这种技术的重建阶段。首先，频率估计通常是多值的，人们不知道如何从分析给出的可能频率中选择用于再合成的频率。其次，输入声音中的正弦分量总是激发几个通道的分析；重建的正弦波可以相互干扰，产生混响声音。提出了一种相位声码器的改进形式，其不产生第一个困难；并提出了一种锁相的方法，减轻了二次合成中相邻信道的锁相问题。
The phase vocoder is widely used to provide high-fidelity time stretching or contraction of audio signals such as speech or monophonic musical passages. Two problems bedevil the reconstructive phase of this technique. First, the frequency estimate is usually multi-valued and one does not know how to choose which of the possible frequencies given by the analysis to use in resynthesis. Second, a sinusoidal component in the incoming sound always excites several channels of the analysis; the reconstructed sine waves can interfere with each other, giving rise to a reverberant sound. An improved formulation of the phase vocoder is proposed for which the first difficulty does not arise; and a means of phase-locking adjacent channels of the resynthesis is proposed which alleviates the second one.