Velocity modulation apparatus for three-tube projection TV

Details Velocity modulation apparatus for three-tube projection TV Velocity modulation apparatus for three-tube projection TV

1992-10-20

1994-11-22

Groody, James J.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348778, H04N 332, H04N 916, H04N 918, H04N 931

Patent

active

053673808

ABSTRACT:
In the velocity modulation apparatus for a three-tube projection television, an effective velocity modulation can be implemented under due consideration of humans eye's relative visibility characteristics with respect to the three primary colors of R, G and B, and the velocity modulation apparatus includes a VM signal extracting circuit 1 for extracting a velocity modulation (VM) signal from the luminance signal; a plurality of driving circuits 3 to 5 having three different gains at ratios of 0. 3:0. 59:0. 11; and a red color VM coil 7, a green color VM coil 8 and a blue color VM coil 9 provided for three corresponding Braun tubes, respectively and driven by the driving circuits 3 to 5, respectively. Since the respective gains of the driving circuits 3 to 5 are previously determined in correspondence to the eye's relative visibility of the three primary colors of R, G and B, it is possible to perform the velocity modulation being based on the practical emphasis at picture image contours, and thereby to eliminate wasteful power consumption.

REFERENCES:
patent: 3830958 (1974-08-01), Fuse et al.
patent: 3936872 (1976-02-01), Miyaoka
patent: 4355326 (1982-10-01), Lee
patent: 4394089 (1983-07-01), McIntosh et al.
patent: 4665432 (1987-05-01), Shima
Susumu Yoshida et al., "Achievement of High Picture Quality In Color CRTs with the Beam-Scan Velocity Modulation Method", IEEE Transactions on Consumer Electronics, vol. CE-23, No. 3, Aug. 1977, pp. 366-373.

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