Efficient encoding/decoding apparatus

摘要: An efficient encoding/decoding apparatus of this invention comprises orthogonal transform element (10) for orthogonally transforming a digital signal obtained by allowing an analog to undergo analog/digital conversion, quantizer (11) quantizing the which has undergone processing, inverse (21) inverse-quantizing is not yet caused and (20) inverse-orthogonally transformed signal, wherein rounding in even number direction or odd used at least one processing processing. Thus, accumulation errors time of, e.g., such direct dubbing repeatedly encode/decode signals as video signals, etc. prevented, thus making it possible reduce picture deterioration multi-generation characteristic.