| 摘要 |
<p>A discriminator device for discriminating between two types of signal applied to an input port (EN), the first type being a binary logic signal having high and low values, and the second type of signal being a continuously variable signal or a floating voltage, the device comprising a voltage divider network (R1,R2) for coupling to the input port and a voltage supply (VCC) in order to provide a format signal, means (R3,R4,R5) providing first and second voltage reference signals (VR1,VR2) having values intermediate the high and low values of the binary logic signal, comparator means (34A,34B) coupled to receive the format signal and the voltage reference signals, the output of the comparator means being coupled to output means (36-39) which provides a logic output signal of a value depending on the type of signal present at the input port. <IMAGE></p> |
