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Television coding system with channel level identification

  • US 4,323,922 A
  • Filed: 12/17/1979
  • Issued: 04/06/1982
  • Est. Priority Date: 12/17/1979
  • Status: Expired due to Term
First Claim
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1. A converter/decoder for use in subscription TV including means for converting any input TV channel to a predetermined output channel, decoding means connected to said converting means for decoding a selected input channel after conversion to said output channel, enabling means for said decoding means, each coded TV signal including data describing the program level of the TV signal, said enabling means further including authorization data receiving means for receiving data at a frequency other than that of a TV signal, said enabling means including means for comparing the TV signal program level data with the authorization data and to enable said decoding means when there is correspondence therebetween.

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