Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1992-08-21
1994-03-15
Groody, James J.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348622, 348690, 348380, H04N 514
Patent
active
052949850
ABSTRACT:
A limiter circuit responds to an input signal which has a plurality of frequencies within a given band. The input signal is split up into two frequency ranges by means of a low pass filter for one range and a high pass filter for a second range. The output of the low pass filter is directed to a first limiter while the output of the high pass filter is directed to a variable notch filter. The outputs from the first limiter and the notch filter are added together to provide a sum signal. The sum signal is applied to a second limiter which performs limiting strictly according to the amplitude. The outputs of the second limiter signal provide the desired signal and a control signal to determine how often the second limiter is limiting. The control signal varies the attenuation of the notch filter. In this manner frequencies, within a selective range and which will be otherwise effected by the spurious frequencies generated during limiting, are reduced.
REFERENCES:
patent: 3529244 (1970-09-01), Torick et al.
patent: 4064537 (1977-12-01), Ota et al.
patent: 4779133 (1988-10-01), Sugimori
patent: 4812905 (1989-03-01), Rossi
patent: 4962426 (1990-10-01), Naoi
"The Theory of Electrical Filters" by J. D. Rhodes, published by John Wiley & Sons (1976), Chapter 8 entitled Digital Filters.
Desor Hans-Juergen
Koehne Heinrich
Deutsche ITT Industries GmbH
Groody James J.
Hsia Sherrie
Peterson Thomas L.
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