Title:
FAST AUTOMATIC GAIN CONTROL CIRCUIT
Document Type and Number:
WIPO Patent Application WO2003047095
Kind Code:
A3
Abstract:
An AGC detector is described, with an input for supplying an input(in) signal, particularly a CVBS signal, an output(out) for supplying a control signal (Vage) and a device for generating the control signal(Vage), which changes the control signal(CVBS) in one direction when the input signal(CVBS) complies with a predetermined property, and changes the control signal in the other direction with a first time constant when the input signal does not comply with the predetermined property. The particular aspect of the invention is that the generating device changes the control voltage(Vage) in the other direction after the end of a predetermined delay interval with a second time constant which is smaller than the first time constant, when the input signal(CVBS) does not comply with the predetermined property during a period which is longer than the predetermined delay interval.
Inventors:
BRILKA JOACHIM (NL)
HAFEMEISTER THOMAS (NL)
HAFEMEISTER THOMAS (NL)
Application Number:
PCT/IB2002/005034
Publication Date:
February 12, 2004
Filing Date:
November 25, 2002
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
PHILIPS CORP INTELLECTUAL PTY (DE)
BRILKA JOACHIM (NL)
HAFEMEISTER THOMAS (NL)
PHILIPS CORP INTELLECTUAL PTY (DE)
BRILKA JOACHIM (NL)
HAFEMEISTER THOMAS (NL)
International Classes:
H04N5/52; (IPC1-7): H04N5/52
Foreign References:
| US4884141A | 1989-11-28 | |||
| US4486795A | 1984-12-04 |
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