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3 records (took 0.019 seconds)

    1.
    发明专利
    未知

    公开(公告)号：IT1150060B

    公开(公告)日：1986-12-10

    申请号：IT2525480

    申请日：1980-10-09

    Applicant: RCA CORP

    Inventor： TODD CHRISTOPHER J ,  DIETERICH CHARLES BENJAMIN

    IPC: H04N5/91 ,  G11B5/02 ,  G11B9/06 ,  G11B27/10 ,  G11B27/30 ,  G11B27/36 ,  H04N9/44 ,  H04N9/77 ,  H04N9/82 ,  H04N9/87 ,  G11B

    Abstract: Digital data is recorded as luminance level in synchronism with the colour subcarrier signal in one horizontal line period adjacent a constant (black) luminance line within the vertical banking interval between adjacent fields of video information on a video disc. The arrangement facilitates separation of the digital information by generating a difference signal between the data line and the black line using the comb filter already provided in the system. The digital data represents field number and type of program content and is used by a microprocessor controller to provide player features such as locked groove detection, program elapsed time display, and end of program indication.

    2.
    发明专利
    未知

    公开(公告)号：IT1132347B

    公开(公告)日：1986-07-02

    申请号：IT2405080

    申请日：1980-08-07

    Applicant: RCA CORP

    Inventor： TODD CHRISTOPHER J ,  WILBER JAMES ALBERT

    IPC: G11B9/06 ,  H04N5/903 ,  G11B19/28 ,  G11B21/02 ,  G11B21/03 ,  H04N9/85 ,  H04N9/89 ,  G11B

    Abstract: Periodic biasing of video disc player signal correction servo to the center of its control range avoids the loss-of-loop gain which otherwise could occur if the servo were continuously biased and minimizes loop stabilization time. Periodic biasing is provided by means of a timing circuit, responsive to a luminance signal transition above blanking level, which enables the servo phase error detector and simultaneously enables a precharging circuit which charges the servo error voltage holding capacitor to a level corresponding to a zero error servo condition. The timing circuit disables the precharging circuit a predetermined time subsequent to an opposite transition of the luminance signal and disables the phase detector subsequent to disabling of the precharging circuit. The period between disabling of the precharging circuit and disabling of the phase detector encompasses the color burst interval of the horizontal sync pulse and may be controlled by selection of offset and slope parameters of an integrator in the timing circuit.

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