Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1997-09-11
2000-05-16
Hunter, Daniel S.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455263, 4552781, H04B 100
Patent
active
060648708
ABSTRACT:
An interference detection circuit includes a circuit, in particular a non-linear circuit, for defining a discrimination curve in terms of instantaneous magnitude and instantaneous frequency, and a circuit, in particular a differential amplifier, for detecting whether a combination, in particular the product, of the instantaneous magnitude and the instantaneous frequency of the inputted signal exceeds the discrimination curve, in which case, a control circuit controls the gating of the inputted signal. The discrimination defining circuit has a control input for adapting the discrimination curve to the average instantaneous magnitude, in particular, the product of the instantaneous magnitude and the instantaneous frequency of the input signal. Thus, small as well as larger input signal amplitudes on which interference is superimposed can be discriminated adequately and reliably in order to minimize audible effects of leaving out interfered part of the input signal.
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Kasperkovitz Wolfdietrich G.
Kuehn Arie
Goodman Edward W.
Hunter Daniel S.
Nguyen Thuan T.
U.S. Philips Corporation
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