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MPEG decoder and optical video disc player using the same

  • US 5,995,709 A
  • Filed: 02/26/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 12/27/1996
  • Status: Expired due to Fees
First Claim
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1. A method, used in an MPEG decoder which receives a data stream including MPEG-coded data which contains closed caption (CC) data in a user data area as character codes (in a user data mode) or in a picture data area as NRZ-converted pixel data (in an MPEG mode) and at least outputting an MPEG-decoded video data stream, for inserting the CC data in the scanning line H21, the method comprising the steps of:

  • storing MPEG-decoded video data in said MPEG-decoded video data stream in a first memory area for storing a frame of video data read by a horizontal scanning line of data for each horizontal scanning period;

    in response to a determination that said CC data is in said user data mode, executing the following steps of;

    converting said CC data in said user data area into NRZ-converted CC data;

    storing said NRZ-converted CC data in a second memory area;

    in a period of a horizontal scanning line H21 (hereinafter, referred to simply as "H21"), outputting said NRZ-converted CC data from said second memory area to a bit map pixel data channel of a video output processor;

    in each of the horizontal scanning periods after H21, outputting the contents of the next line of said first memory area to a video pixel data channel of said video output processor, andin response to a determination that said CC data is in said MPEG mode executing the following steps of;

    in a period of said line H21 outputting the contents of the first line of said first memory area;

    in each of the horizontal scanning periods after H21, outputting the contents of the next line of said first memory area; and

    excluding at least said line H21 from vertical interpolation target.

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