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. 17, 1990
Filed:
Mar. 18, 1987
Edward O'Connor, Cleveland, OH (US);
Other;
Abstract
The threshold-extension receiving system combines parallel multiple direct-demodulating FM demodulators each demodulating the direct RF or IF signal, in conjunction with restricted bandwidth associated with each direct demodulator for removing the noise which is present from the band occupied at a given instant by a part of the modulated signal. Each FM direct-demodulator of the receiving system is tuned to a bandwidth centered on the instantaneous RF or IF frequency of a selected direct modulation component, rather than on the mid-frequency of the signal as a whole, such modulation component being treated as undergoing a relatively limited displacement within the total FM band occupied by the signal. The individual restricted bandwidths may be fixed or adaptively tuned. The individual direct FM components of an FM television signal are direct-demodulated by this system separately, rather than as a group, enabling a resultant lowering of overall FM threshold at which the receiver can operate properly, when the direct-RF or IF demodulated separated FM components are recombined to reconstruct a reproduced signal.