Accession Number : ADD014097

Title :   Digital Detection Circuit.

Descriptive Note : Patent, Filed 25 Jun 87, patented 7 Feb 89,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Rhodes, Melvin H

Report Date : 07 Feb 1989

Pagination or Media Count : 7

Abstract : A digital pulse detection apparatus for correcting a distorted serial digital signal by differencing the signal and a delayed version of the signal in a differential amplifier to obtain the slope of the digital signal. The output signal from the differential amplifier is applied to a voltage hysteresis differential amplifier which provides the corrected digital output signal. Many different methods have been used to recover a serial digital signal sent over long transmission lines where the transmission line causes a distortion of the signal. A long transmission line will cause a distortion of the digital signal when the transmission line's pulse response does not allow the signal transition to reach its final value between any two signal voltage transitions. The present invention utilizes a digital signal differencing circuit for recovery of a serial digital signal which is sent over a long transmission line and is distorted by the transmission line. Since the long transmission line distortion affects basically the pulse signal level, the only part of the received signal that can provide reliable timing information is the start of each voltage transition. Patents.

Descriptors :   *DETECTORS, *DIGITAL SYSTEMS, *PATENTS, *VOLTAGE AMPLIFIERS, AMPLIFIERS, TIMING CIRCUITS, CORRECTIONS, DETECTION, DISTORTION, HYSTERESIS, LONG RANGE(DISTANCE), OUTPUT, PULSES, RELIABILITY(ELECTRONICS), SIGNALS, TRANSITIONS, TRANSMISSION LINES

Subject Categories : Electrical and Electronic Equipment
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE