Patent ID: 6453283
Filing Date: 2002-09-17
Classification: G10L

Abstract:
A method of coding an audio equivalent signal, the method comprising:determining successive pitch periods or frequencies in the signal; forming a sequence of mutually overlapping or adjacent analysis segments by positioning a chain of time windows with respect to the signal and weighting the signal according to an associated window function of the respective time window; for each of the analysis segments: determining an amplitude value and a phase value for a plurality of frequency components of the analysis segment, including a plurality of harmonic frequencies of the pitch frequency corresponding to the analysis segment, determining a noise value for each of the frequency components by comparing the phase value for the frequency component of the analysis segment to a corresponding phase value for at least one preceding or following analysis segment; the noise value for a frequency component representing a contribution of a periodic component and an aperiodic component to the analysis segment at the frequency; and. representing the analysis segment by the amplitude value and the noise value for each of the frequency components.