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:
Mar. 03, 1981
Filed:
Oct. 19, 1979
Ian A Vance, Newport, GB;
International Standard Electric Corporation, New York, NY (US);
Abstract
A radio receiver for frequency modulated (FM) tones. Received signals are split and one split portion of the signal is phase shifted relative to the other and mixed with a local oscillator. The signal as received clocks a flip-flop. The phase shifted signal is fed to the switching input of the flip-flop. The input signal having been modulated with an FM tone which oscillates about the frequency of the local oscillator, the output of the flip-flop is a digital waveform the frequency of which is the same as that of the modulating tone. This digital waveform is applied to a band pass filter accepting the fundamental frequency of the digital wave form from the flip-flop for passage to a detector.