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:
Oct. 11, 1977
Filed:
Aug. 13, 1975
Applicant:
Inventor:
Jean Fellrath, Neuchatel, CH;
Assignee:
Centre Electronique Horloger S.A., Neuchatel, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ; H04L / ;
U.S. Cl.
CPC ...
325320 ; 178 88 ; 325419 ;
Abstract
A device for transmission of information by pulse code frequency shift modulation. The device incorporates a phase-locked superheterodyne receiver including a single voltage controlled oscillator, and a demodulator including a phase comparator and a phase shifter. The intermediate frequency is equal to one half the input signal frequency shift. The comparator compares the phases of the intermediate frequency signal and of a signal of the same frequency derived from the voltage controlled oscillator to provide a message output.