| 摘要 |
PURPOSE:To assure the decision for presence or absence of a signal to be detected if the noise is incorporated in an input signal, by providing a deciding circuit which extracts the output signal of a memory and then decides the presence or absence of a signal for each prescribed detecting period. CONSTITUTION:The prescribed reference value is supplied to a comparator 22 from a reference value setting circuit 23, and this reference value is compared with the count value. Here the reference value is set at ''4'' for example. Then the comparator 22 delivers a signal of level ''1'' when the count value exceeds the reference value. This signal is supplied to a memory 17 together with a writing pulse signal corresponding to a detecting signal ID and stored in response to the detecting period. The several period components are read out and supplied to a deciding circuit 18 for the signal stored in the memory 17. The circuit 18 decides the presence or absence of a signal obtained in a prescribed detecting period. That is, when the output signal level of the memory 17 is set at ''1'' in a certain period, the ''presence'' of a signal is decided for the corresponding period. |
