To prevent a high frequency component of noise from being injected to a high frequency receiver by separating a ground wiring for the high frequency receiver and a ground wiring for an arithmetic processing circuit including a CPU into different systems and subjecting them to arithmetic processing.
The controller has plural high frequency receivers 2 and a CPU 1 for arithmetic processing for digital signals outputted from the high frequency receivers 2, an I/O 3 providing an output of the result operated by the CPU 1 as a control signal, a ROM and a RAM storing a control program for arithmetic operation and constants for control program. Then the ground wiring is separated into two systems for the arithmetic processing and for the high frequency signals and the two systems of wires are connected together at a power supply section 9. Thus, the noise of the ground line for the high frequency circuit is reduced to be less than criterion and the effect of noise in the CPU 1 arithmetic processing system onto the high frequency circuit is avoided.
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NAKAZURU KUNITO
NOZAWA KAZUNORI
HITACHI CAR ENG CO LTD