| 摘要 |
PURPOSE:To eliminate a noise signal and to prevent the malfunction of a decca receiver by controlling a detecting circuit with a gate signal, which detects a synchronously inputted signal, to detect a synchronous pulse signal. CONSTITUTION:A decca multipulse signal having a prescribed period is inputted to an input terminal 1. In an output signal 13 of a level converting circuit 7 which is the last circuit of a decca multipulse signal detector, a decca multipulse signal A which is synchronized with the input decca signal and has 1mus pulse width and a pulse signal (d) due to noise are mixed. A signal generating circuit 10 generates a positive gate signal B, which is synchronized with the signal A and has a pulse width slightly wider than that of the signal A, and a negative gate signal C which is generated in a period other than the period of the signal B. A detecting circuit 9 is operated only during the input period of the positive gate signal B and detects only the decca multipulse signal A and outputs it to an output terminal 8. |
