INFORMATION SIGNAL ENCODING DEVICE, ENCODING METHOD AND INFORMATION SIGNAL DECODING METHOD

摘要

PROBLEM TO BE SOLVED: To reduce quantization distortion at the time of quantizing blocked data. SOLUTION: Residual signals generated by predictive-encoding input digital information signals are blocked and a minimum value MIN and a dynamic range DR for each block are detected. The residual signals are selectively supplied to quantizers 81-8n by a distributor 6 and selection is performed by selection signals SL in the distributor 6. For the selection signals SL, the deviation of the presence range of the residual signals is checked based on the minimum value MIN and the dynamic range DR of the residual signals and the quantizer of quantization characteristics for making a quantization step small is selected in the presence range. Quantization output and the selection signals SL are transmitted or recorded.