Dequantization circuit, dequantization method, and image reproduction device

Abstract

Provided are a versatile inverse quantization circuit which performs inverse quantization operable for various encoding systems by a single circuit, an inverse quantization method, and an image reproducing apparatus. A first multiplier generation unit (10) generates a first multiplier M1, a second multiplier generation unit (20) generates a second multiplier M2, a shift quantity generation unit (180) generates shift quantity data SF indicating a bit shift quantity, a multiplication unit (140) multiplies quantized coefficient data CD by the first multiplier M1 and the second multiplier M2, a shift unit (170) carries out bit shift operation in accordance with the shift quantity data SF, at least one of the multiplication unit (140) and the shift unit (170) determines whether or not to perform operation depending on the encoding system, and at least one of the first multiplier generation unit (10), the second multiplier generation unit (20) and the shift quantity generation unit (180) determines a value to be generated or a way of generating the value depending on the encoding system.

Description

technical field [0001] The present invention relates to an inverse quantization circuit, an inverse quantization method, and an image reproducing device in decoding processing of an image-based encoding system. Background technique [0002] In recent years, various multimedia services have been widely used due to the high-speed network and the rapid spread of personal computers and digital television receivers in ordinary households. In particular, in a digital broadcasting system, a content delivery system using the Internet, etc., a method is generally adopted in which content data (content data) such as video and audio is based on the MPEG (Moving Picture Experts Group, Moving Picture Experts Group, Image Compression Standard) method and other standards to perform compression coding, use the fragments of the coded data as the compressed coded content data as packets, and transmit or record the collection of packets as a stream signal In a hard disk, DVD or memory card, e...

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Problems solved by technology

[0007] However, as in the conventional image decoding device, there is a problem that when constructing the inverse quantization unit corresponding to each encoding method, the circuit scale increases, and for example, when a new encoding method is proposed, it is difficult to respond quickly. LSI (Large Scale Integration) etc. for decoding processing need to be redesigned

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