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. 20, 1987
Filed:
Oct. 09, 1984
Michael K Pedigo, Southport, IN (US);
Other;
Abstract
A carrier current telephone system is provided for buildings. Transceivers are located where desired. The transmitter portion includes means for establishing a carrier signal and applying the same to the AC circuits in the building. Further means are provided for generating a subcarrier signal which is encoded on the carrier signal by frequency modulation of the carrier. Further means are provided for encoding the audio or data signal upon the subcarrier signal by frequency modulation of the subcarrier. Exclusive-OR gates are used in a voltage controlled oscillator for the subcarrier signal generator. Unique phase lock loop FM demodulators are used. Each comprises one CMOS 4070B exclusive-OR gate package, five resistors, one potentiometer, and three capacitors, with one of the exclusive-OR gates performing the phase detector function.