| 摘要 |
<p>PURPOSE:To promote reliability by inputting pulse signals to a squelch and a code discrimination/output section, and inputting an output of the squelch circuit into the code discrimination/output section to discriminate a specific code among the pulse signals. CONSTITUTION:A electric wave that an FM signal SFN received is demodulated to converter the demodulated signal into a specific the oritical level by a comparator 2. After that, a specific code of an output S2 is discriminated by a squelch circuit 3, and the output is inputted into a code discrimination/output section 4 to turn it into an operational state. Then, the code discrimination/output section 4 discriminates whether or not a code to be set in advance corresponds with a code of the signal S2. In case of correspondence, and in case it corresponds with a decision signal SS, a signal S4 to be released or locked is outputted. According to the constitution, it is surely operated by a code to be transmitted, and reliability can be promoted.</p> |
