Code division multiplex system using selectable length spreading code
sequences
    4.
    发明授权
    Code division multiplex system using selectable length spreading code sequences 失效
    码分多址系统使用可选长度扩展码序列

    公开(公告)号:US4930140A

    公开(公告)日:1990-05-29

    申请号:US297412

    申请日:1989-01-13

    CPC classification number: H04J13/16

    Abstract: A code division multiplex system for use in a spread spectrum communication system utilizes selectable length spread spectrum spreading code sequences. At the encoder, one of a pluraluty of a spread spectrum spreading code sequences having a given fixed length is selected for differential encoding in accordance with the input data to be transmitted. At the receiver correlator, a selectable length differential decoder is set to be responsive to a spread spectrum spreading code sequence having a length substantially equal to the length of the encoded spread spectrum spreading code sequence.

    Pixel preheat system for an automated thermal transfer device
    9.
    发明授权
    Pixel preheat system for an automated thermal transfer device 失效
    用于自动热转印装置的像素预热系统

    公开(公告)号:US4859093A

    公开(公告)日:1989-08-22

    申请号:US170756

    申请日:1988-03-21

    CPC classification number: B41J2/38

    Abstract: A pixel preheat system for a thermal transfer device in which a selected image is transferred from a strip of color carrying ribbon to a strip of image carrying tape achieves precise control of the temperature of the individual pixel heating elements in a thermal printhead by combining the pixel data values just printed with the pixel data values to be printed to generate a pixel preheat value whenever either of the pixel data values is off or white. The present invention maintains the temperature of the individual pixel heating elements closer to the transition temperature of the thermal transfer ribbon and uses fewer circuit components.

    Abstract translation: 用于热转印装置的像素预热系统,其中所选择的图像从彩色带状带传送到图像携带带,通过组合像素,可以精确地控制热打印头中各个像素加热元件的温度 数据值刚刚打印有要打印的像素数据值,以便每当像素数据值都关闭或白色时生成像素预热值。 本发明保持各个像素加热元件的温度更接近热转印带的转变温度并且使用更少的电路部件。

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