| 摘要 |
The invention relates to a method for extracting audio signal parameters and a coder using said method. Said coder estimates amplitudes ( alpha p) of spectral rays, in the audio signal spectrum (s(t)), corresponding to harmonics with an estimated fundamental frequency. The spectrum is subdivided into several portions corresponding to different frequency bands. For each band, one modelling type is selected according to a criterion for comparing between the energies of the portion of the spectrum and of a harmonic representation of said portion, which is defined by quantities including the amplitudes of spectral rays corresponding to the harmonics included in the band. The selected modelling types are transmitted to the decoder along with the spectral samples having positions dependent on said modelling types.
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