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Data transmission apparatus for transmitting code data

  • US 5,481,554 A
  • Filed: 08/31/1993
  • Issued: 01/02/1996
  • Est. Priority Date: 09/02/1992
  • Status: Expired due to Term
First Claim
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1. A data transmission apparatus for transmitting block code data in which a block of plural pixels proximate in space is encoded as a unit to compress the amount of data needed for transmission, wherein said block code data includes important data which exhibits hierarchically high importance for subsequent decoding, said transmission apparatus comprising:

  • sum data generating means for summing the plural important data of plural blocks to form sum data;

    means for transmitting said sum data in at least one channel different from the channels used to transmit said plural important data; and

    wherein an erroneous one of said plural important data is restorable from said sum data as received and said plural important data as received.

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