Patent ID: 9548059
Date: 2017-01-17
CPC Classifications: G10L

Claim:
1. A decoder for generating an analogue output signal from digital coded signals, the digital coded signals comprising a digital coded lowband audio signal, the decoder comprising: a separator configured to separate the digital coded lowband audio signal from the digital coded signals; an audio decoder configured to decode the digital coded lowband audio signal to obtain a digital decoded audio signal; a digital analysis filterbank configured to generate a plurality of digital source range subband signals; a high frequency reconstruction/envelope adjustment unit configured to generate a plurality of consecutive digital reconstruction range subband signals by frequency-translating at least a subset of the digital source range subband signals and to apply an envelope correction, wherein frequencies of the digital reconstruction range subband signals are higher than frequencies of the digital source range subband signals, and wherein a digital source range subband signal having a subband index i is frequency-translated to a digital reconstruction range subband signal having a subband index j, and wherein a digital source range subband signal having a subband index i+1 is frequency-translated to a digital reconstruction range subband signal having a subband index j+1; a digital synthesis filterbank configured to generate a wideband digital output signal by filtering the digital source range subband signals and the digital reconstruction range subband signals; and a digital to analogue converter configured to convert the wideband digital output signal to the analogue output signal.