LOSSLESS ENCODER, LOSSLESS RECORDING MEDIUM, LOSSLESS DECODER AND LOSSLESS ENCODER AND DECODER

摘要

PROBLEM TO BE SOLVED: To provide a high-definition encoder having no degradation by operating a run length compressing operation due to division into plural sub-bands, reduction in the number of bits on the noise floor of linear PCM and the decision of a scale factor. ;SOLUTION: Mode information is inputted to a mode information input terminal 44, and a full operating mode is set by a system control part 14. An input signal is inputted to a wide band audio data input terminal 41, and noise floor information and input signal band information of sub-band for each signal frequency band 24KHz are respectively impressed to a noise floor information input terminal 42 and an input signal band information input terminal 43. Information for commanding the encoding request of 1st mode and wide band audio mode is inputted to a mode information input terminal 44 and based on this command, a code system control part 14 sets a sub-band dividing filter 10. Besides, redundant run length compression parts 31-34 detect and compress the peaks of signal level in sub-bands at every prescribed time. Thus, the high- definition encoder can be provided.;COPYRIGHT: (C)1997,JPO