Adjustable coring circuit permitting coring extinction

Details Adjustable coring circuit permitting coring extinction Adjustable coring circuit permitting coring extinction

1983-01-25

1984-03-20

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

307500, 328143, H04N 9535

Patent

active

044384548

ABSTRACT:
Adjustable coring circuit includes linear amplifier and multistage limiting amplifier responsive to input signals from a common source. Limiting amplifier includes an input stage receiving operating current from a first current source transistor, in cascade with an output stage receiving operating current from a second current source transistor. Cored signal, corresponding to the difference between a linearly translated version of the input signals and a doubly clipped version thereof, is developed by a signal combiner responsive to outputs of both amplifiers. Base-emitter paths of the two current source transistors are connected in series across a common bias source. The base electrodes of two control transistors, of mutually opposite conductivity types, respond to variations of common coring level control voltage. Collector-emitter path of one control transistor shunts base-emitter path of first current source transistor. Emitter-collector path of other control transistor, which shunts the common bias source, is nonconducting over major portion of variation range of coring level control voltage.

REFERENCES:
patent: 4167749 (1979-09-01), Burrus
patent: 4223340 (1980-09-01), Bingham et al.
Article by J. P. Rossi, entitled "Digital Techniques for Reducing Television Noise", appearing on pp. 134-140 of Mar., 1978 issue of SMPTE Journal.
Article by R. H. McMann, et al., entitled "Improved Signal Processing Techniques for Color Television Broadcasting", appearing on pp. 221-228 of Mar., 1968 issue of SMPTE Journal.

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