Automatic threshold adjustment circuit for digital data communic

Pulse or digital communications – Repeaters – Testing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

307359, H04L 7506

Patent

active

048478652

ABSTRACT:
An improved threshold circuit (30) for reconstructing digitally-encoded, optically-transmitted signals is disclosed. The threshold circuit (30) automatically compensates for amplitude variations in the received signal due to noise, gain variations, and the like, and thereby provides improved accuracy in reproduction of the digitally-encoded signal. An amplifier (120) generates an output signal the level of which, under low signal amplitude, is linearly related to the instantaneous level of the digitally-encoded input signal. An active low pass linear filter (122, 124, 132) generates from the amplified output signal a signal the level of which corresponds to the average level of the amplified output signal. A bias signal generator (40) receives the average level signal on one input and a selected reference signal on the other. The bias generator (40) outputs a bias signal the level and polarity of which are related to the degree and polarity of difference between the average level signal and the reference signal. The bias signal biases the linear amplifier (120) to compensate for any variations of the average level of the amplified input signal from a selected threshold value that corresponds to the reference signal. A trigger circuit (45) converts the bias-controlled, amplified signal to digital square wave pulses corresponding to the transmitted digitally-encoded signal.

REFERENCES:
patent: 3176236 (1965-03-01), Abbot et al.
patent: 3509279 (1970-04-01), Martin et al.
patent: 4241455 (1980-12-01), Eibner
patent: 4387465 (1983-06-01), Becker
patent: 4459699 (1984-07-01), Monticelli et al.
Document entitled "A Noise Immune 32M6/S Optical Data Link", Sixth European Conference on Optical Communication, York, Sep. 1980, pp. 458-461.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Automatic threshold adjustment circuit for digital data communic does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic threshold adjustment circuit for digital data communic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic threshold adjustment circuit for digital data communic will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-442954

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.