Patent ID: 7617097

Claim:
A scalable lossless audio coding apparatus comprising: a lossy coding unit which lossy codes an input audio signal and generates the result of the lossy coding as a base layer; a lossy signal regenerating unit which decodes the base layer, compares a decoded signal with the input audio signal, and regenerates a lossy signal that is lost when the lossy coding is implemented; a lossless coding unit which lossless codes the regenerated lossy signal and generates the result of the lossless coding as an enhancement layer, wherein the lossless coding unit comprises; a predictor which predicts a lossy signal to be generated next based on the regenerated lossy signal, an error generator which compares the regenerated lossy signal with the predicted lossy signal, detects an error between the regenerated lossy signal and the predicted lossy signal, and outputs the result of the detection as an error signal, and a lossless coder which lossless codes the error signal to generate the enhancement layer; and a multiplexing unit which multiplexes the base layer with the enhancement layer and generates one output bitstream.