| 摘要 |
<p>PURPOSE:To shorten no signal detecting time at a receiver side of a vehicle by providing two systems of signal generating circuits, allowing both to divide and output signals of the prescribed frequencies in the circuit configurations and constructing to permit the frequency divider of the other system to subsequently divide the frequency from the state immediately before the malfunction of one system when the one system malfunctions. CONSTITUTION:Two systems of signal generating circuits which respectively have generators 301, 302 of clock signals CP1, CP2 of the prescribed frequency, frequency dividers 311, 312 which divide the clock signals and output low frequency signals, and detectors 341, 342 which detect whether the circuits of the respective stages normally operate or not are composed, and the systems are switched at contacts 36a, 36b. The frequency dividers 311, 312 respectively have trigger circuits 401, 402 which generate trigger signals in response to whether the relay 36 operates or not, FF411, 412 which are set or reset by the trigger circuits, and counters 421, 422 of two preset types for dividing the frequency.</p> |
