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:
Aug. 02, 1977
Filed:
Apr. 08, 1976
Francois Gabriel Caron, Cagnes-sur-Mer, FR;
Andre Eugene Desblache, Nice, FR;
Dominique Noel Godard, Le Rouret, FR;
Francis Paul Maddens, Cagnes-sur-Mer, FR;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A clock setting circuit is provided at a receiving modem for adjusting the phase of a timing signal defining the signal sampling instants. The received signal is filtered in two filters to derive a first signal having a phase .phi..sub.1 and a frequency f.sub.1 equal to f.sub.c - 1/2T, f.sub.c being the carrier frequency and 1/T being the transmission baud rate, and a second signal having a phase .phi..sub.2 and a frequency f.sub.2 equal to f.sub.c + 1/2T. The first and second derived signals are combined to derive an error signal indicative of the phase difference .phi..sub.2 - .phi..sub.1 which difference is used for adjusting the phase of a phase locked oscillator which provides the timing signal.