Mid-pulse detector

Details Mid-pulse detector Mid-pulse detector

1976-04-29

1977-03-22

Heyman, John S.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

328110, 325320, 178 88, 307235E, 328140, H03K 910

Patent

active

040139670

ABSTRACT:
Apparatus, in a receiver, for detecting the mid-pulse phase reversal of an nput signal s(t) = a(t).sub.BLT cos (.omega..sub.0 t + .theta..sub.1). The signal a(t).sub.BLT is a modulating signal a(t), having a phase-reversal at its midpoint, after bandlimiting by a transmitter, and cos (.omega..sub.0 t + .theta..sub.1) relates to a carrier having a frequency f.sub.0 and phase angle .theta..sub.1. The apparatus comprises a hard-limiter, a low-pass filter, threshold detector, a delay timing logic circuit, and a comparator, serving as a zero-crossing detector, whose input is connected to the output of the low-pass filter, which detects the mid-pulse zero-crossing of its input signal. The apparatus further includes an AND gate, whose output comprises a positive-going pulse whose trailing edge represents the mid-pulse of its input signal, and a one-shot, whose output is a sharp pulse representing the mid-pulse of a(t).

REFERENCES:
patent: 3491305 (1970-01-01), Stone
patent: 3493877 (1970-02-01), Jacobson
patent: 3581220 (1971-05-01), Bell
patent: 3684967 (1972-08-01), Kelly
patent: 3902129 (1975-08-01), Boothroyd

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