METHOD AND APPARATUS FOR PREDICTING HIGH BAND EXCITATION SIGNAL

摘要

A method and an apparatus for predicting a high band excitation signal are disclosed. The method includes: acquiring, according to a received low band bitstream, a set of spectral frequency parameters that are arranged in an order of frequencies, calculating a spectral frequency parameter difference between every two spectral frequency parameters that have a same position interval; acquiring a minimum spectral frequency parameter difference from the calculated spectral frequency parameter differences; determining, according to a frequency bin that corresponds to the minimum spectral frequency parameter difference, a start frequency bin for predicting a high band excitation signal from a low band; and predicting the high band excitation signal from the low band according to the start frequency bin. By implementing embodiments of the present invention, a high band excitation signal can be better predicted, thereby improving performance of the high band excitation signal.

主权项

1. A method for predicting a high band excitation signal, comprising:
decoding, a received low band bitstream, wherein a set of spectral frequency parameters are acquired via the decoding, wherein the set of spectral frequency parameters have an ordering relationship according to associated frequencies, wherein the spectral frequency parameters comprise low band line spectral frequency (LSF) parameters or low band immittance spectral frequency (ISF) parameters; comparing spectral frequency parameter differences associated with at least two pairs of the spectral frequency parameters, wherein each pair of the spectral frequency parameters are related with a same ordering position interval according to the ordering relationship ; selecting one of the at least two pairs of the spectral frequency parameters based on the comparison, wherein the selected one pair is associated with a particular one spectral frequency parameter difference; determining, according to a frequency bin that corresponds to the particular one spectral frequency parameter difference, a start frequency bin for predicting a high band excitation signal from a low band; and generating the high band excitation signal predicted from a low band according to the start frequency bin.