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:
Jun. 11, 1991
Filed:
May. 15, 1989
Applicant:
Inventor:
Werner Reich, Emmendingen, DE;
Assignee:
Deutsche ITT Industries GmbH, Freiburg, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
341 50 ; 358198 ;
Abstract
A digital deemphasis circuit for the BTSC multichannel television standard includes a square-root extractor, a digital filter having the transfer function F(z)=(b-ac)/(z+a), where a, b and c are constants that determine the frequency response of the digital filter. The digital deemphasis circuit further includes a subcircuit that transforms the output signal from the square-root extractor into three quantities w1, w2, w3 that are applied as multiplicands to three multipliers to control the operation of the deemphasis circuit.