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. 07, 1987
Filed:
Mar. 06, 1986
Ronald H Chapman, Wheaton, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An incoming signal is received and processed through a discriminator function. A reference signal is generated corresponding to the incoming signal. First and second difference signals, corresponding to the frequency difference between the reference signal and the incoming signal are generated, each having a unique phase. A direction signal is generated from the first and second difference signals to indicate if the incoming signal frequency is greater than or less than the reference signal frequency. Pulses are generated which relate to the difference in frequency between the reference signal and the incoming signal, and a recovery circuit is used for recovering modulation from the generated pulses and the direction signal.