Sound analysis and resynthesis using correlograms

A system for analyzing and resynthesizing a sound, comprising:

• a cochlear model which produces a parametric representation of a sound;
• an autocorrelator for processing said parametric representation to provide data regarding periodicity of the sound;
• means for generating an estimated signal from a Fourier Transform of said data;
• and
• means for processing said estimated signal in an inverse manner from said cochlear model to produce a resynthesized sound waveform.

A method for resynthesizing a sound from a correlogram that is representative of the sound, comprising the steps of:

• obtaining a Fourier transform of at least one channel of the correlogram;
• estimating a signal for said channel of the correlogram from its Fourier transform;
• and
• processing the estimated signal through an inverted cochlear model to produce a synthesized sound waveform.

A method for resynthesizing a sound waveform from sequence of short-time auto-correlation functions, comprising the steps of:

• obtaining Fourier transforms of the auto-correlation functions;
• overlapping and adding successive windows of data obtained from the Fourier transforms to obtain successive signal estimates;
• and
• adjusting each added window of data, relative to the signal estimate obtained from the previously added windows of data, to provide a maximum cross-correlation between the window of data and the signal estimate, to thereby generate a resynthesized waveform representative of a sound.