Signal limiting apparatus having improved spurious signal perfor

Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction

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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.

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