Patents Assigned to Hitachi Denshi Kabushiki Kaisha Ltd.
  • Patent number: 4549117
    Abstract: A circuit for generating a signal for correcting deflection of electron beam, which circuit is advantageously used as, for example, a circuit for correcting registration in a multi-tube type color television camera. In the correction signal generating circuit, quantities of corrections at intersections defined by a plurality of lines extending in horizontal and vertical directions so as to divide a surface scanned by the electron beam into a plurality of areas are stored in terms of digital values. The digital signal read out from the memory is converted into an analog signal. The analog signal is then supplied to low-pass filter means. From the output signal of the low-pass filter means, quantities of correction are prepared for the scanning lines present between the two intersections located adjacent to each other in the vertical direction. In the circuit, the shading is positively prevented from occurring.
    Type: Grant
    Filed: February 8, 1984
    Date of Patent: October 22, 1985
    Assignees: Hitachi, Ltd., Hitachi Denshi Kabushiki Kaisha Ltd.
    Inventors: Kenji Takahashi, Shizuka Ishibashi, Koji Kudo, Yukihiro Masuda, Takuma Kodama