| abstract |
An audio coding scheme allowing PCM signal to lossless DSD signal expansion for next generation optical disc formats. The encoder (ENC) upsamples a PCM signal to the DSD sample rate. Then a set of -loop filter parameters (LFP) is generated for a noise-shaping loop of a sigma-delta modulator (SDM). A correction signal (CS) indicates the difference between a sigma- delta modulated version of the up-sampled PCM signal (UPCM) and the target DSD signal (IDSD) . The correction signal (CS) may be adapted to be applied to the original PCM signal (PCM), to the up-sampled PCM signal (UPCM) or to the output bit stream (ODSD) . An expansion bit stream (EBS) includes the loop filter parameters (LFP) and the correction signal. The decoder (DEC) can reproduce the original DSD signal based on the PCM signal (PCM) and the expansion bit stream (EBS). |