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    DIGITAL SIGNAL VIDEO COLOR COMPRESSION METHOD AND APPARATUS
    1.
    发明专利
    DIGITAL SIGNAL VIDEO COLOR COMPRESSION METHOD AND APPARATUS 未知

    公开(公告)号：CA2092630C

    公开(公告)日：1998-12-22

    申请号：CA2092630

    申请日：1993-03-12

    Applicant: IBM

    Inventor： LUCAS BRUCE DAVID ,  MACINNIS ALEXANDER GARLAND ,  YOSIM PAUL STEWART

    IPC: G09G5/00 ,  G09G3/20 ,  G09G5/02 ,  H04N1/64 ,  H04N11/04 ,  G06T1/00

    Abstract: This invention provides a method of and apparatus for compressing digital video color signals derived from a natural image and generating display signals for a color image composed of pixels derived from the compressed signals in which digital color signals representative of color depth intensities of three colors for each pixel to be displayed, each color signal having at least four bits representing the color intensity of a corresponding color for a corresponding pixel and arranged from most to least significant bits, are received; a digital dither signal for each pixel to be displayed is generated; a selected number of the most significant bits of each received color signal are summed with the corresponding generated dither signal; a selected number of the least significant bits of the summed color and dither signals are discarded to compress the corresponding received color signal; the compressed color signals related to a common pixel are concatenated to generate a digital output signal having a predetermined bit length less than the summed bit lengths of the received digital color signals and representative of the depth intensities of three colors for the common pixel; and analog display driver signals representative of the color intensities of pixels to be displayed are generated by selecting from a color lookup table stored in a digital to analog converter analog signals corresponding to the stored output signals.

    FLUX CENTERING AND POWER CONTROL FOR HIGH FREQUENCY SWITCHING POWER SUPPLIES
    3.
    发明专利
    FLUX CENTERING AND POWER CONTROL FOR HIGH FREQUENCY SWITCHING POWER SUPPLIES 未知

    公开(公告)号：DE3472514D1

    公开(公告)日：1988-08-04

    申请号：DE3472514

    申请日：1984-12-04

    Applicant: IBM

    Inventor： MACINNIS ALEXANDER GARLAND ,  NUNNERY WILLIAM BURRELL

    IPC: H02M3/28 ,  H02M3/337 ,  H02M7/538

    Abstract: A method and apparatus for controlling a power supply which includes a power transformer having primary and secondary windings and switching transistors for switching currentthrough the windings. The apparatus includes circuitry for generating a composite signal representative of the flux and magnetizing current (I m ) in the power transformer. The composite signal is correlated with a multiphase clocking signal to generate a pulsewidth modulated (PWM) signal which is used to drive the switching transistors.

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