The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 1977
Filed:
Sep. 23, 1974
James H Sexton, Duncanville, TX (US);
Bobbie J Patton, Dallas, TX (US);
John W Harrell, Duncanville, TX (US);
Mobil Oil Corporation, New York, NY (US);
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.