Deflection system for a cathode ray tube used in synthetic generators of curves comprising a vertical deflection device and a horizontal deflection device. Each of the devices comprises a main loop with a main deflection coil producing a deflection having a high amplitude with a slow variation and a secondary loop with a secondary coil producing a deflection having a low amplitude with a rapid variation; the main loop is fed by a deflection signal and produces an error signal feeding the secondary loop. Compensation for the delay and for the faults inserted by the main loop and use of only one deflection signal for each device is provided.
A device enables to reproduce without flicker mixed signals from VT and/or BTX decoders during the reproduction of television signals (mixed operation). This is obtained by a video frequency scanning field compensation in the vertical direction effected by a video frequency additional connectable scanning amplifier which supplies a reduced inductivity additional scanning winding.
In a constant speed stroke-write vector display system having a video gate signal for initiating the video display of a stroke vector at a time coincident with the start of the horizontal and vertical deflection signals, the deflection signals starting value for each displayed vector is offset by an amount which is proportional to, but of opposite polarity with, the rate magnitude of the respective deflection signal, and the video gate signal is delayed for a time interval following the start of the deflection signals, the amount of time delay being substantially equal to the product of either deflection signal offset amount and the reciprocal of the respective deflection signal rate magnitude.
