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:
Apr. 15, 1986
Filed:
Oct. 16, 1981
Richard C Eden, Thousand Oaks, CA (US);
Ira Deyhimy, Thousand Oaks, CA (US);
Timothy J Quilici, Thousand Oaks, CA (US);
American Diversified Capital Corporation, Costa Mesa, CA (US);
Abstract
A data communication system for general purposes having a new ternary carrier frequency shift keying (TCSK) signal. The system is applied to a utility load control by transmission of a sub-carrier of an FM broadcast channel. It is decoded by a receiver, SCA decoder, TCSK filter and a two level or binary converter and used to communicate to a pre-programmed microprocessor which enables various load control functions to be performed. The general system also is given for a QPSK (quadraphase shift keying) operating system. A data transmission filter is split between the transmitter and receiver and is operated in cascade to give individual interference filtering at each end of the transmission while also providing combined action and wave shaping. A high accuracy FM decoder using zero crossing detection enables data recovery with simple circuits. A novel random time load restoration circuit for ramp-up is disclosed. A fail safe relay operator is also disclosed. The TCSK employs a novel 19 character hex code format which is 8 bit microprocessor compatible and directly usable for other purposes such as ASCII message transmission. Both QPSK and TCSK systems offer command structures of variable length so as to permit truncation of message and reduce total message transmit time.