Automatic bit synchronization method and apparatus for a logging

Details Automatic bit synchronization method and apparatus for a logging Automatic bit synchronization method and apparatus for a logging

1974-09-23

1977-01-04

Birmiel, Howard A.

Communications: electrical

Selective

Interrogation response

325321, 340 18P, 178 691, G01V 140, H04L 702

Patent

active

040017753

ABSTRACT:
In a system for logging while drilling, an uphole receiver demodulates a received acoustic signal to produce a synchronously rectified signal with a polarity representative of the phase state of the acoustic signal. A detector produces a bit value pulse indicative of the phase state of the acoustic signal over a bit time interval. Clock pulses produced by the receiver define the expected boundaries and midpoint of the bit time interval. An integrator integrates the synchronously rectified signal from the midpoint of one bit time interval to the midpoint of the next succeeding bit time interval. Any deviation from zero of the integrator's output over an interval of the acoustic signal including a phase state change is a bit phase error signal. The clock pulses are phase shifted to occur earlier or later in time in accordance with the polarity and magnitude of the bit phase error so as to be synchronized with the true boundaries and midpoint of the bit time interval.

REFERENCES:
patent: 3626298 (1971-12-01), Paine
patent: 3746800 (1973-07-01), Stuart
patent: 3789303 (1974-01-01), Hoffman et al.
patent: 3789355 (1974-01-01), Patton
patent: 3909724 (1975-09-01), Spoth et al.

Affiliated with

Also associated with

Rating

Automatic bit synchronization method and apparatus for a logging 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 bit synchronization method and apparatus for a logging, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic bit synchronization method and apparatus for a logging will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-258580