HIGH EFFICIENCY ENCODING/DECODING DEVICE.

摘要

A high efficiency encoding/decoding device provided with an orthogonal transformer (10) which orthogonally transforms digital signals obtained by A/D-converting analog signals, a quantizer (11) which quantizes the orthogonally-transformed digital signals, a reverse quantizer (21) which reversely quantizes the digital signals before reverse orthogonal transformation, and a reverse orthogonal transformer (20) which performs reverse orthogonal transformation of the orthogonally-transformed digital signals. Rounding in the even-number or odd-number direction is applied to at least the orthogonal transformation or reverse orthogonal transformation. Therefore, the accumulation of rounding errors can be prevented at the time of, for example, direct digital dubbing in which such digital signals as video signals are repeatedly encoded and decoded, and the deterioration of the quality of image having multi-generation characteristics can be prevented.