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:
Dec. 23, 1986
Filed:
Sep. 24, 1985
Applicant:
Inventor:
Brian H Beech, Bishopstoke, GB;
Assignee:
Independent Broadcasting Authority, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03D / ; H04N / ;
U.S. Cl.
CPC ...
329 50 ; 329122 ; 358 23 ; 455260 ; 455312 ;
Abstract
A phase lock loop demodulator has its loop amplifier and filter designed such that the transfer function of the amplifier and filter is optimized for the presence of sound and color subcarriers. An equalizer circuit is included in the demodulator for equalizing the demodulator response and has a transfer function which is independent of the transfer function of the loop filter and amplifier whereby to render the demodulator insensitive to small frequency errors around the subcarrier frequencies.