| 摘要 |
PURPOSE:To simplify a device constitution by constituting a parallel/serial conversion circuit used for parallel/serial conversion in such a way that a part of picture element data among parallel picture element data obtained from Hadamard inverse transform is substituted for other picture element data. CONSTITUTION:An Hadamard inverse transform circuit 22 and the parallel/serial conversion circuit 23 are provided. For the circuit 22, a circuit outputting only x'13 being one component among picture element data x'00-x'13 which are originally obtained eight is used, and adders and subtractors requiring 24 devices in total so far can be simplified to only seven subtractors 22b. Picture data x'13 is supplied to the circuit 23 as represent of other picture element data x'00-x'<13>, whereby only the output of data x'13 instead of them may be enough in a period when original data x'00-x'13 are outputted, and the constitution is simplified compared to a conventional parallel-serial conversion circuit.
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