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. 21, 1986
Filed:
Jun. 01, 1983
Elvin D Stepp, Fairfield, OH (US);
Gary L Claypoole, West Chester, OH (US);
Cincinnati Electronics Corporation, Cincinnati, OH (US);
Abstract
A carrier wave is frequency modulated to one of M different output frequencies that deviate from the carrier wave frequency by .+-.k.sub.1, .+-.k.sub.2 . . . .+-.k.sub.q. The carrier is modulated in response to a clocked digital signal having n data bits forming a data word, where M=2.sup.n. In response to the digital signal an n bit control signal is derived. M/2 clock frequencies synchronized with the clock data signal are simultaneously derived. An up-down counter responds to the control signal so that one bit of the control signal controls the counting direction of the counter and (n-1) of the bits control which one of the M/2 frequencies is applied to a clock input of the counter. In response to the count in the counter, orthogonal sinusoidal like waves at one of the frequencies k.sub.1, k.sub.2 . . . k.sub.q are derived. The M/2 clock frequencies are equal to k.sub.1 2.sup.P, k.sub.2 2.sup.P . . . k.sub.q 2.sup.P, where P is the number of clock frequency bits in the counter. The orthogonal sinusoidal like waves at the selected frequency are vectorially combined with the carrier wave to derive a constant amplitude wave that deviates from the carrier frequency by the selected frequency k.sub.1, k.sub.2 . . . k.sub.q in a direction controlled by the value of the one bit.