Importance

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Abstract

It is an object of the present invention to simultaneously perform input or output of picture signals for a plurality of components. An image data input interface (310) is capable of input of picture signals (Pm) of three components at its maximum. For example, when picture signals (Pm) of three components are inputted, a clock divider (410) supplies a 1/3 divided signal of a clock signal (CLK) to the image data input interface (310) on the basis of a selection signal (SEL). In the image date input interface (310), the picture signals (Pm) of three components are simultaneously inputted in synchronization with the 1/3 divided signal and they are sent out to a discrete cosine transform unit (4) in synchronization with the clock signal (CLK). The component to which the sent picture signals (Pxy) belong sequentially changes for every 8.times.8 picture elements. It has the effect of simultaneously performing input or output of picture signals for a plurality of components while matching with operation of a coding device unit is maintained.

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First Claim