| 摘要 |
PURPOSE:To obtain a data discriminating circuit with less malfunction by controlling a switching circuit provided at an output of a comparator by an output signal of an input signal detecting circuit discrminating the presence of an input digital signal. CONSTITUTION:An input signal detecting circuit 4 detects the presence of the digital input signal of a comparator 1, and when the input signal exists, a detecting signal of the circuit 4 closes a switch 5, applies a data to a digital signal processing circuit 3, and when no input signal exists, the switch 5 is opened so as not to apply data to the circuit 3. Thus, when no input signal exists, since the abnormal data due to input noise is not applied to the circuit 3, the malfunction of the system using the signal in the data as a control signal is prevented. |
