A new audio analysis/synthesis system of adapted window controlled by estimated fundamental frequency
Yong Ma · Informationization · 2009
The fundamental frequency of short time spectral always varies with the real times,which results in the span between the harmonics varies,while the time signal shows fast or slow variations.The changes of resolution of time or frequency are required in the situation illustrated above.The conventional fixed windows can not satisfy the requirement of resolution both in time and frequency,as leads to the mistake in the analysis of short time.This paper proposes a new adapted audio analysis/synthesis system based on deterministic plus stochastic model in which the size of analysis window is controlled by estimated fundamental frequency in order to improve the effect of analysis for partials.New algorithms and theoretical methods are taken in the design of analysis window,partials determination and tracking and the department of residuals.This scheme offers a robust alternative as the flexible efficient fundamental frame for the music modifying.