Patent ID: 6348879
Filing Date: 2002-02-19
Classification: G10L,H03M

Abstract:
Apparatus for encoding of a digital information signal, such as an n-channel digital audio signal, where n is an integer larger than 1, comprisinginput means for receiving the digital information signal, encoding means for encoding the digital information signal so as to obtain an encoded digital information signal, the encoding means being adapted to encode each of said channel signals of the n-channel digital audio signal so as to obtain an encoded channel signal for each of said channel signals in response to probability values for each of said channel signals, prediction filter means for carrying out a prediction filtering on each of said channel signals of the n-channel digital audio signal in response to a set of prediction filter coefficients for each of said channel signal so as to obtain a prediction filtered channel signal from each of said channel signals, prediction filter coefficient determining means for generating a set of prediction filter coefficients for each of said channel signals, probability value determining means for generating probability values for each of said channel signals in response to a probability table for each of said channel signals and the corresponding prediction filtered channel signal for each of said channel signals, probability table determining means for generating the probability tables for each of said channel signals, converting means for generating first mapping information and a plurality of m sets of prediction filter coefficients, where m is an integer for which holds 1&lE;m&lE;n, said first mapping information and m sets of prediction filter coefficients being representative of said n sets of prediction filter coefficients for said n channels, and for generating second mapping information and a plurality of p probability tables, where p is an integer for which holds 1&lE;p&lE;n, said second mapping information and p probability tables being representative of said n probability tables for said n channels, combining means for combining said compressed digital information signal, said first and second mapping information signals, said plurality of m sets of prediction filter coefficients and said plurality of p probability tables into a composite information signal, output means for outputting said composite information signal.