| 摘要 |
PROBLEM TO BE SOLVED: To provide a discriminating circuit being hardly affected by surrounding noise and vibration. SOLUTION: This circuit 1 comprises a pulse signal generating means 2 generating a pulse signal from an input voice signal, a signal insulating means 3 electrically insulating between an input terminal and an output terminal, a voice signal applied to an input terminal is made a voice and directly detected and converted into a pulse signal without returning a voice signal again. Thereby, even when a noise and vibration exists around, the circuit is not affected by them, and existence of a voice signal is discriminated and outputted insulating by the signal insulating means 3. |
