DECODER AND METHOD FOR DECODING AN AUDIO SIGNAL, ENCODER AND METHOD FOR ENCODING AN AUDIO SIGNAL

摘要

A decoder for decoding an audio signal includes a first target spectrum generator for generating a target spectrum for a first time frame of a subband signal of the audio signal using first correction data. A first phase corrector for corrects a phase of the subband signal in the first time frame of the audio signal determined with a phase correction algorithm, the correction being performed by reducing a difference between a measure of the subband signal in the first time frame of the audio signal and the target spectrum. An audio subband signal calculator calculates the audio subband signal for the first time frame using a corrected phase for the time frame and for calculating audio subband signals for a second time frame different from the first time frame using the measure of the subband signal in the second time frame or using a corrected phase calculation in accordance with a further phase correction algorithm different from the phase correction algorithm.

主权项

1. A decoder for decoding an audio signal, the decoder comprising:
a first target spectrum generator for generating a first target spectrum for a first time frame of a subband signal of the audio signal using first correction data; a first phase corrector for correcting, with a first phase correction algorithm, a phase of the subband signal in the first time frame of the audio signal wherein the correction is performed by reducing, for the first time frame, a difference between a measure of the subband signal in the first time frame of the audio signal and the first target spectrum; an audio subband signal calculator for calculating the audio subband signal for the first time frame using a corrected phase determined by the first phase corrector for the first time frame; a second target spectrum generator, wherein the second target spectrum generator is configured for generating a second target spectrum for the second time frame of the subband of the audio signal using second correction data; a second phase corrector for correcting, with a second phase correction algorithm, a phase of the subband signal in the second time frame of the audio signal, wherein the correction is performed by reducing, for the second time frame, a difference between a measure of the subband signal in the second time frame of the audio signal and the second target spectrum, wherein the second phase correction algorithm is different from the first phase correction algorithm, and wherein the audio subband signal calculator is configured for calculating the audio subband signal for the second time frame using a corrected phase determined by the second phase corrector for the second time frame.