PURPOSE:To process fast data such as image data in a real time, by reducing the number of conversion cycles in fast Hadamard transformation. CONSTITUTION:The fast Hadamard conversion is performed by a data selection operation and (n/2) adder/subtractor groups 4 by using (n) register groups 2 having input/output lines of one word respectively in its memory device. Thereby, in an (n)th (n=2m)-order fast Hadamard transformer, a conversion cycle required for (nXm) times in a conventional device can be reduced to (m) times of the conversion cycle, which reduces the number of times remarkably, and the fast data such as the image data can be handled in the real time.
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