| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for efficient recovery of a high frequency component of an audio signal from a low frequency component of the same audio signal.SOLUTION: A method for determining a first banded tonality value 312 for a first frequency subband of an audio signal is described. The first banded tonality value 312 is used for approximating a high frequency component of the audio signal based on a low frequency component of the audio signal. The method comprises determining a set of transform coefficients in a corresponding set of frequency bins based on a block of the audio signal; determining a set of bin tonality values 341 for the set of frequency bins using the set of transform coefficients, respectively; and combining a first subset of two or more of the set of bin tonality values 341 for two or more corresponding adjacent frequency bins of the set of frequency bins lying within the first frequency subband, thereby yielding the first banded tonality value 312 for the first frequency subband.SELECTED DRAWING: Figure 3b |
