An Analysis of Startup and Dynamic Latency in phase vocoder-Based Time-stretching Algorithms
نویسندگان
چکیده
The phase vocoder has become a popular method for timestretching audio (altering its play rate without changing its pitch) in recent years. Despite continuing improvements to the algorithm itself for enhanced audio quality, the latency introduced by the processing is less wellunderstood. Such an understanding is crucial for accurate synchronization in the context of a larger interactive multimedia or computer music system. Our analysis shows that the phase vocoder has an effective startup latency of 2 (Ra −Rs), and a dynamic latency (in response to rate changes) of 2Rs, where Ra and Rs are the input and output hop factors used for time-stretching.
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