Phase-locking midpulse detector

Details Phase-locking midpulse detector Phase-locking midpulse detector

1976-03-01

1977-01-18

Heyman, John S.

Oscillators

Relaxation oscillators

328133, 331 1A, 331 25, 329122, H03B 304

Patent

active

040042359

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.c t + .theta.). The signal a(t).sub.BLT is a modulating signal a(t), having a phase-reversal at its midpoint, after band-limiting by a transmitter, and cos (.omega..sub.c t + .theta.) relates to a carrier having a frequency f.sub.c and arbitrary phase angle .theta.. The apparatus comprises a hard-limiter and amplifier, a phase-lock loop circuit, a multiplier circuit, a low-pass filter, a comparator, serving the function of a 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 a(t).sub.BLTR.sub.' and therefore of a(t). The apparatus further includes an AND gate, whose input comprises a positive-going pulse whose trailing edge represents the mid-pulse of a (t).sub.BLTR ; and a one-shot, whose output is a sharp pulse representing the mid-pulse of a(t).

REFERENCES:
patent: 3703686 (1972-11-01), Hekimian
patent: 3758870 (1973-09-01), Schmitt et al.
patent: 3868579 (1975-02-01), Dilley
patent: 3956710 (1976-05-01), Seitz et al.

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