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. 30, 1997
Filed:
Dec. 01, 1995
Matthias Peters, Neu Wulmstorf, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A circuit arrangement for amplitude-dependent attenuation of a television signal supplies amplitude values below a predeterminable limit value as an output signal amplified by a first gain factor, and, at amplitude values above the limit value, supplies the part of the amplitude below the limit value as an output signal amplified by the first gain factor and parts of the amplitude above the limit value as an output signal amplified by a second gain factor, the second gain factor being chosen to be smaller than the first gain factor. To realize this circuit arrangement in the current range, the television signal is a current signal which is applied to a main branch (1; 13) and a sub-branch (2; 14) in which the current signal is applied to the emitter of at least one transistor (3,5; 15,18) via a resistor (4,6; 16,19), the base of each transistor (3,5; 15,18) is biased with respect to a reference potential by DC sources (7,8; 17,24), the collector current of the transistor (3; 15) in the main branch (1; 13) essentially represents the output signal, and the limit value is predeterminable by the difference between the base potentials of the two transistors (3,5; 15,18) and the second gain factor is predeterminable by means of the resistance ratio between the two resistors (4,6; 16,19).