Patent ID: 7617110
Filing Date: 2009-11-10
Classification: G10L

Abstract:
1. A lossless audio encoding method performed by a lossless audio encoding apparatus, comprising: mapping an audio spectral signal received by the lossless audio encoding apparatus in a frequency domain to a bit plane signal according to frequency; obtaining a most significant bit and a golumb parameter for each of the bit planes; selecting binary samples that are to be encoded from bit planes in sequence from a most significant bit to a least significant bit and from a lowest frequency component to a highest frequency component; computing a context of the selected binary samples using already encoded samples; selecting a probability model using the golomb parameter and the context; and losslessly encoding the selected binary samples using the probability model, wherein during the computing of the context of the selected binary samples, the context of the selected binary samples is computed using information regarding whether already encoded upper bit plane values at a frequency are present, and the context is determined to have a value of 1 when at least one of the upper bit plane values is 1, and determined to have a value of 0 otherwise.