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TRANSMISSION SYSTEM FOR AUDIO AND CODING SIGNALS IN EDUCATIONAL TV

  • US 3,916,092 A
  • Filed: 05/25/1973
  • Issued: 10/28/1975
  • Est. Priority Date: 05/25/1973
  • Status: Expired due to Term
First Claim
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1. A transmitter apparatus for a plurality of input audio signals and video signals, all of which are modulated onto a subcarrier for transmission on a single TV carrier signal, the combination comprising:

  • means for generating a horizontal sync pulse between successive horizontal scan lines forming said video signals;

    blanking means in the signal path of said video signals for defining a blanked guard-band interval at a time apart from a generated horizontal sync pulse;

    means for sampling each input audio signal, and means for amplitude modulating the sampling of said plurality of audio signals onto a subcarrier during said blanked guard-band interval apart from which interval said video signals are modulated onto the subcarrier during each horizontal picture scan line.

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