Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1989-08-23
1990-12-11
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2970, H01J 2976
Patent
active
049773550
ABSTRACT:
A convergence control system for a television apparatus, for example a projection television, comprises: a plurality of channels, each channel having a digital memory for storing a set of grid coordinate values defining a convergence correction grid; and, a pair of multiplying digital to analog converters for the grid coordinate values. A single circuit for generating sequential digital addresses is coupled to each of the channels for outputting the grid coordinate values from each of the digital memories to respective multiplying digital to analog converters of the channel. The values of respective horizontal grid lines are supplied to only one of the multiplying digital to analog coverters. A single waveform generator develops a pair of analog waveforms of complementary phase for modulating respective multiplying digital to analog converters of each pair in each channel. The sum of the modulating waveforms is constant. The succession of modulated analog values define the convergence correction signal for each channel.
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Application Guide From Analog Devices, pp. 43-46, Section 6.5.3.
Altmanshofer Robert D.
Hall, Jr. Estill T.
Parker Robert P.
Rodriguez-Cavazos Enrique
Blum Theodore M.
Fried Harvey D.
Laks Joseph J.
RCA Licensing Corportion
Tripoli Joseph S.
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