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Filter by-pass for transmitting an additional signal with a video signal

  • US 5,617,148 A
  • Filed: 03/31/1995
  • Issued: 04/01/1997
  • Est. Priority Date: 06/14/1991
  • Status: Expired due to Fees
First Claim
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1. In a processor for injecting a second signal into a primary video signal for subsequent transmission having a power spectrum and blanking intervals separating active video lines, the processor comprising:

  • a blanking interval detector responsive to the primary video signal;

    a controllable element responsive to the video signal and the blanking interval detector and providing at an output an output video signal having at least one substantially attenuated portion of the power spectrum during at least some portions of the active video lines and leaving the same portion of the power signal spectrum substantially unattenuated during at least some of the blanking intervals; and

    a secondary section injecting the second signal into the output of the controllable element.

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