Patent ID: 7680552

Claim:
Method for obtaining an envelope adjusted and frequency-translated signal by high-frequency spectral reconstruction of complex subband signals in channels within a reconstruction range using complex subband signals in source area channels derived from a lowband signal, using a digital filter bank having an analysis part and a synthesis part, the method comprising: filtering the lowband signal by means of the analysis part to obtain of the complex subband signals in the source area channels; calculating a number of consecutive complex subband signals in channels within the reconstruction range using a number of frequency-translated consecutive complex subband signals in the source area channels and an envelope correction for obtaining a predetermined spectral envelope, wherein the reconstruction range comprises channel frequencies which are higher in frequency than frequencies in the source area channels, wherein a complex subband signal in a source area channel having an index i is frequency-translated to a complex subband signal in a reconstruction range channel having an index j, and wherein a complex subband signal in a source area channel having an index i+1 is frequency-translated to a complex subband signal in a reconstruction range channel having an index j+1; and filtering the consecutive complex subband signals in channels within the reconstruction range by means of the synthesis part to obtain an envelope adjusted and frequency-translated signal.