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:
Jun. 01, 1982
Filed:
Jul. 10, 1980
William H Mosley, Jr, St. Petersburg, FL (US);
Carl F Andren, Indiatlantic, FL (US);
E-Systems, Inc., Dallas, TX (US);
Abstract
Three sample and hold circuits (26, 30 and 34) sample a received pulse amplitude modulated signal at twice the data bit frequency or timing of the received signal. The clock to the sample and hold circuits is timed so that three consecutive samples, two mid-bit samples and a transition sample are held in the circuits (26, 30 and 34) once every two sample periods. The mid-bit samples are added together by an adder (32) and divided by two in a divider (38) to provide an average. The transition sample is subtracted from this average in a subtractor (36) to produce an error signal. The error signal is normalized in a multiplier (44) using the reciprocal of the difference in magnitude between the two mid-bit samples to produce a normalized signal. A clock signal is generated by a voltage controlled oscillator (52) in response to the normalized signal at twice the bit frequency or bit timing and in synchronism therewith.