Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1988-12-27
1990-06-19
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2970, H01J 2976
Patent
active
049356747
ABSTRACT:
A multi-channel, multiple deflection waveform generator for a convergence control system and the like comprises an analog circuit source for a plurality of basic waveforms and a basic waveform processor for each of a plurality of channels. Each of the channel processors may comprise a plurality of circuits for modifying the basic waveforms, a circuit for combining any combination of modified waveforms to form a specifically configured composite waveform and a remotely controllable shift register for independently setting each of the plurality of modifying circuits from a central control, for example, by means of an existing serial bus. Each of the modifying circuits may comprise a first part for altering the scale of one of the basic waveforms and a second part for altering the gain of the same one of the basic waveforms. Each of the remotely controlled shift registers has a setting for selecting any one of a plurality of predetermined operating conditions for one of the first and second parts of the modifying circuit. In one embodiment, the operating condition for the other one of the first and second modifying parts may be preselected and fixed. In another embodiment, another shift register may store a second setting for selecting any one of a second plurality of predetermined operating conditions for the other of the first and second parts of the modifying circuit. Each channel processor may be remotely controlled to generate a specifically configured composite waveform, for example, for driving a different one of a plurality of deflection coils in the convergence yokes of a projection television. The invention may also be embodied as a custom analog waveform generating module adapted to operate within the digital control architecture of a host apparatus, such as a television, video recorder or the like.
REFERENCES:
patent: 4441057 (1984-04-01), Wrona
Blum Theodore M.
Fried Harvey D.
Laks Joseph J.
RCA Licensing Corporation
Tripoli Joseph S.
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