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Enabling a display of closed captioning status upon detecting a code of a proper subset of closed-caption data codes

  • US 5,428,400 A
  • Filed: 01/29/1993
  • Issued: 06/27/1995
  • Est. Priority Date: 01/29/1993
  • Status: Expired due to Term
First Claim
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1. A detector for detecting the presence of closed-caption data in a video signal, comprising:

  • means for receiving and decoding said closed-caption data;

    said closed-captioned data including a proper subset of closed-caption data codes;

    control means for continually monitoring said decoded closed-caption data for an indication of the presence of any of said proper subset of closed-caption data codes;

    means for timing a predetermined time period, said means for timing being controlled by said control means;

    said control means resetting said timing means to begin timing a predetermined time interval, and enabling generation of a message indicating availability of closed-caption data upon detecting any of said proper subset of said closed-caption data codes;

    said control means disabling generation of said message if a subsequent one of said proper subset of said closed-caption data codes is not detected before the expiration of said time interval.

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