| 摘要 |
<p>PURPOSE:To enable to discriminate simply a modulation signal by responding the leading edge of a high frequency pulse modulated by a low frequency pulse, and generating simultaneously a signal shorter than the pulse width and longer than the pulse width at shorter period than the high frequency pulse. CONSTITUTION:A high frequency pulse FH signal (a) modulated by a low frequency pusled FL signal is inputted to monostable multivibrators 13, 14 and FFs 15, 16 of a high frequency signal discriminating circuit. Time constants of the multivibrators 13, 14 are set shorter than and longer than pulse width of the signal (c) respectively, and fall responding to the front of leading edge of the signal (c), and after a specified time, the rear of leading edge signals (d), (f) are outputted from a Q' terminal and inputted to FF 15, 16. FF 15, 16 input signals (e), (g) to AND gate responding to rise of the signals (d), (f), and outputs a high frequency signal discriminating signal (h) from a gate 17. Pulse FL of the signal c is regenerated by integrating circuits 18, 19, and low frequency signal is discriminated by a circuit consisting of monostable multivibrators 20, 21, an FF and an AND gate.</p> |
