Sound analysis/synthesis

Patent Granted PROBLEM TO BE SOLVED: To provide novel sound analysis/synthesis techniques for improving parameter estimation accuracy of a sinusoid signal having time variation thereby greatly improving accuracy of sound analysis and further sound re-synthesis. ; SOLUTION: A sound signal analysis method is characterized in that a phase function of a first harmonic component is estimated through local variation rate encoding for an input sound signal having time variation characteristics, then the time axis of the signal is converted into its phase axis and the converted signal is analyzed again through the local variation rate encoding, and thus momentary amplitudes, momentary frequencies, and momentary phases of all components of the input signal are output as parameter functions capable of re-synthesis.