H - Electricity
04
N
352/20
H04N 7/08 (2006.01) H04L 25/06 (2006.01) H04N 7/088 (2006.01) H04N 9/85 (2006.01)
Patent
CA 1163365
RCA 74,251 ABSTRACT A current source supplies current to an integrator representative of a difference between the instantaneous and average values of a video signal having a PCM data component time division multiplexed with an analog luminance component. The integrator is enabled during the central portion of each PCM signaling interval and reset to a reference level during initial and terminal portions of the intervals. Asymmetry of the peak-to-peak PCM signal levels with respect to the average signal level tends to result in asymmetrical excursions of the integrator output voltage relative to the reference level. This asymmetry is corrected by means of a charge source that supplied a predetermined quantity of charge con- tinuously or in discrete packets to the integrator during the central portion of each PCM signaling interval. The integrator voltage excursions are thereby equalized and a substantially uniform probability of detection of the PCM data levels may be realized by means of a threshold device having a threshold level substantially equal to the reference level.
370820
Morneau Roland L.
Rca Corporation
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