Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1985-09-04
1987-09-08
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307234, 307265, 328 58, H03K 908
Patent
active
046927107
ABSTRACT:
The pulse-width discrimination system receives an input pulse whose leading edge enables an oscillator. The oscillator outputs frequency pulses to a comparison counter which counts the frequency pulses and compares them to a predetermined value, representing a minimum pulse width in which the user is interested. If the predetermined value is reached, the comparison counter triggers a tolerance window network which outputs a pulse, whose width represents the tolerance window, to one input of a coincidence output network. The input pulse is also received by a trailing-edge detector, which outputs a pulse to another input of the coincidence output network upon detection of the input pulse's trailing edge. If the input pulse's trailing edge coincides with the tolerance window, the coincidence output network will output an indication signal. Regardless of coincidence, the trailing edge of the input pulse disenables the oscillator, and the comparison counter is reset by the trailing-edge detector's output pulse. The oscillator is enabled for the length of the input pulse, and the comparison counter, which counts the oscillator frequency pulses, resets to an initial value every time it reaches a predetermined value. As the predetermined value represents the minimum pulse width, the comparison counter triggers the tolerance window network every minimum pulse-width duration, and harmonics thereof. Accordingly, the pulse-width discrimination system of the present invention will discriminate all pulses whose width is within the tolerance window of the fundamental pulse duration, or harmonics thereof.
The pulse-width discrimination system can also be configured to detect only pulses whose width is within the fundamental pulse duration, disregarding harmonics thereof.
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V. G. Hansen, "Studies of Logarithmic Radar Receiver Using Pulse-Length Discrimination," IEEE Transactions on Aerospace and Electronic Systems, vol. AES-1, No. 3, Dec. 1965, pp. 246-253.
S. Sarpangal, "Build a Pulse-Width Detector with a 555 Timer," EDN Magazine, Oct. 5, 1977, p. 93.
Electronic Design & Research, Inc.
Heyman John S.
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