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Method and apparatus for providing dual language captioning of a television program

  • US 5,294,982 A
  • Filed: 12/24/1991
  • Issued: 03/15/1994
  • Est. Priority Date: 12/24/1991
  • Status: Expired due to Fees
First Claim
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1. In decoder apparatus for decoding data encoded on particular horizontal lines of a vertical blanking interval of a composite video signal, a method for decoding the encoded data characterized by the steps ofreceiving the encoded data as a serial data stream of data frames, each data frame comprising a synchronization field and two data bytes.retrieving data packets from the data frames,decoding the data packets, each data packet comprising a plurality of data bytes, the data packets indicated by particular bit indications appearing in one of the plurality of bytes of each data packet,storing a plurality of letter components in memory for at least two languages, a first language having the Roman alphabet and a second language having a syllabic alphabet,determining if the data packet represents a non-printable character, andmapping remaining bit positions of the data packet for a printable character into a number of letter component pointer bytes less than or equal to the number of bytes comprising the data packets, the letter component pointer bytes for pointing to one of a Roman alphabet letter or a syllabic alphabet letter component in memory for display.

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