Patent ID: 7536302
Filing Date: 2009-05-19
Classification: G10L

Abstract:
1. An audio coding method comprising: receiving audio signals; processing the audio signals to generate base data and enhancement data, the base data containing data capable of being decoded to generate a portion of the audio signals, the enhancement data covering at least two spectral sections of data representative of a residual portion of the audio signals, wherein the base data include a plurality of bands each having at least one spectral line for storing quantized audio data, and each of the spectral sections of the enhancement data has at least one spectral band having at least one spectral line; calculating zero-line ratios of the bands in the base data, wherein a zero-line ratio of a band is the ratio of the number of spectral lines with zero quantized value to the number of spectral lines in the band; coding the enhancement data and up-shifting the band by at least one plane if a corresponding zero-line ratio of the band is higher than or equal to a prescribed ratio bound, wherein the number of the at least one plane that the band is up-shifted varies with the range of the corresponding zero-line ratio; and rearranging the enhancement data according to sectional factors associated with the spectral sections to allow output data to be generated from rearranged enhancement data.