Coded data generation or conversion – Converter compensation
Patent
1994-03-31
1996-09-03
Young, Brian K.
Coded data generation or conversion
Converter compensation
341155, H03M 112
Patent
active
055527833
ABSTRACT:
A voltage shift feedback system offsets the signal amplitude of an incoming analog video signal so that a more accurate analog-to-digital conversion of the analog video signal can be achieved in an analog-to-digital convertor. The voltage shift feedback system comprises an input capacitor for isolating the system from the analog video signal and a feedback loop. The feedback loop comprises a separator mechanism in the preferred embodiment for determining when the analog video signal exhibits a particular amplitude, such as a blank level or a synchronization level, and for generating a separator output indicative thereof. An offset control logic monitors the digital pixel data output from the ADC and the separator output. A variable current mechanism is connected to the offset control logic and the ADC input connection for supplying a continuous current i.sub.c to the ADC input. When the analog video signal exhibits the particular amplitude, the offset control logic compares the digital pixel data from the ADC to a predetermined range, preferably a desired synchronization or blank amplitude range, and adjusts the current so that the digital pixel data converges toward the predetermined range.
REFERENCES:
patent: 4771267 (1988-09-01), Russell et al.
Hewlett--Packard Company
Young Brian K.
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