Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1981-04-23
1983-03-01
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
307511, 307527, 328 63, 331 4, H03L 706
Patent
active
043756930
ABSTRACT:
A partly analog partly digital bit synchronizer capable of acquisition and operation over an arbitrarily broad range of data rates is disclosed. A second order phase lock loop (PLL) is employed providing both phase and frequency correction to a voltage controlled oscillator (VCO). The phase detector consists of a binary counter whose most significant bit (MSB) is defined to be the recovered clock. The desired data transition points are defined as coinciding with the falling edge of the counter's MSB. At each data transition, the least significant bits within the counter are used to set the duration of phase and frequency correction pulses proportional to the phase error, which pulses are then fed to the VCO. An acquisition circuit diverts the frequency correction pulses in order to sweep the VCO within a selected half octave. Lock is recognized when a preselected number of data transitions with phase error below a preset maximum occur consecutively. An autorange capability automatically steps the frequency through half octaves within an arbitrarily large range.
REFERENCES:
patent: 3646452 (1972-02-01), Horowitz et al.
patent: 3781695 (1973-12-01), Jackson
patent: 3959601 (1976-05-01), Olevsky et al.
patent: 4019153 (1977-04-01), Cox, Jr. et al.
patent: 4031317 (1977-06-01), McClain et al.
patent: 4077016 (1978-02-01), Sanders et al.
patent: 4079329 (1978-03-01), England et al.
patent: 4122405 (1978-10-01), Tietz et al.
patent: 4166979 (1979-09-01), Waggener
patent: 4210776 (1980-07-01), VanMeter
patent: 4316152 (1982-02-01), Meyer
Bellisio, J. A., "A New Phase Locked Timing Recovery Method for Digital Regenerators", IEEE, International Conference on Communications, Jun. 1976, Philadelphia, Pa., pp. 10-17 et seq.
Ford Aerospace & Communications Corporation
Radlo Edward J.
Safourek Benedict V.
Sanborn Robert D.
LandOfFree
Adaptive sweep bit synchronizer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive sweep bit synchronizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive sweep bit synchronizer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1462480