H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/56
H04N 5/44 (2006.01) H04N 5/14 (2006.01)
Patent
CA 1225144
Abstract Apparatus is provided for processing a digital video signal capable of exhibiting positive and negative values from a source. A means is provided for producing the absolute value of the digital signal. A further means produces a signal corresponding to the difference between the absolute values and a reference value supplied from a source. A polarity discriminator passes differences of one polarity only. A polarity inverting circuit inverts the polarity of samples applied to its input in response to the polarity of the signal samples occurring at the source of digital video signals. Means are provided for coupling the polarity discriminator to the input of the polarity inverting circuit. In this way the output of the polarity inverting circuit is a symmetrically processed signal fictionally dependent upon the reference value. Alternatively, first and second threshold/polarity discriminators receive respective first and second reference values, supplied from a source at respective reference signal input ports. Means couple the signal input port of the first threshold/polarity discriminator to the absolute value means and the input port of the second threshold/polarity discriminator to the output port of the first threshold/polarity discriminator. The threshold/polarity discriminators provide output signals of one polarity only for applied input signals that would exceed the reference value. A signal scaling means has its input coupled to the output of the second threshold/polarity discriminator. A signal combiner has one input coupled to the output of the signal scaler and another output coupled to the output of the first threshold/polarity discriminator. A processed digital signal is available at the output of the signal combiner.
478179
Eckersley Raymond A.
Rca Corporation
LandOfFree
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