Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1983-09-26
1986-08-05
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340723, 340732, 340744, 340814, G09G 106
Patent
active
046046143
ABSTRACT:
In order to compensate for image distortion introduced into a digitally-controlled raster-scan CRT by the finite video amplifier rise and fall times, the digital video drive waveform is subject to selective pulse stretching to extend where possible the duration of pels which represent critical features of the image. This is achieved by decoding means for examining each pel at least in relation to its two immediate neighbors on either side in order to detect predetermined relationships between the values of the pels, and retiming means for selectively advancing or delaying the transitions between consecutive pels of different value in accordance with the relationships so detected.
In one embodiment, suitable for multibit or single bit video, the decoding means comprises means (40, 25) for comparing each pel with its immediate successor, a shift register (26 to 28) for storing the result of each comparison together with the results of a plurality of immediately preceding comparisons, and a logic circuit (30 to 33) connected to the shift register stages, and the retiming means comprises a delay path (41 to 44) for the waveform having an output register (44) and means (34 to 39) responsive to the logic circuit for clocking the output register at a predetermined time in relation to non-selected transitions, earlier than the said predetermined time in relation to transitions selected for advancement, and later than the said predetermined time in relation to transitions selected for delay.
REFERENCES:
patent: 4040088 (1977-08-01), Hannan
patent: 4215414 (1980-07-01), Huelsman
patent: 4393378 (1983-07-01), Danielsen et al.
IBM Technical Disclosure Bulletin, vol. 17, No. 11, Apr. 1975; pp. 3325-3327; M. Nasser et al; Correction of Phase Distortion in a Television Receiver when Used for Character Display Purposes.
IBM Technical Disclosure Bulletin, vol. 17, No. 11; 4/75; pp. 3323-3324; M. Nasser et al., "Correction of Amplitude Distortion in a Television Receiver when Used for Character Display Purposes".
IBM Technical Disclosure Bulletin, vol. 24, No. 11B, Apr. 1982--B. O. Chase--"Pulse Stretching for CRT Display Visibility", pp. 5794-5795.
Farr Robert W. E.
Judd Ian D.
Brier Jeffery A.
Brigance Gerald L.
International Business Machines Corp.
Poag Frederick D.
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