DEQUANTIZATION CIRCUIT, DEQUANTIZATION METHOD, AND IMAGE REPRODUCTION DEVICE

摘要

Provided are a versatile dequantization circuit which performs dequantization corresponding to various encoding schemes by a single circuit, a dequantization method, and an image reproduction device. A first multiplier generation part (10) generates a first multiplier M1. A second multiplier generation part (20) generates a second multiplier M2. A shift quantity generation part (180) generates shift quantity data SF showing a bit shift quantity. A multiplication part (140) multiplies quantization coefficient data CD by the first multiplier M1 and the second multiplier M2. A shift part (170) carries out bit shift operation corresponding to the shift quantity data SF. At least either the multiplication part (140) or the shift part (170) determines whether to perform operation depending on the encoding system. At least one of the first multiplier generation part (10), the second multiplier generation part (20) and the shift quantity generation part (180) determines a value to be generated or a method for generating the value depending on the encoding system.