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Signal swap apparatus for a television receiver having an HDTV main picture signal processor and an NTSC Pix-in-Pix signal processor

  • US 5,453,796 A
  • Filed: 06/28/1994
  • Issued: 09/26/1995
  • Est. Priority Date: 06/28/1994
  • Status: Expired due to Term
First Claim
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1. A television receiver, comprising:

  • a conventional tuner and signal processing arrangement for receiving and processing a television signal in a conventional format, and having an output at which said television signal of said conventional format is developed, said conventional tuner being responsive to a first control signal;

    an HDTV tuner and signal processing arrangement for receiving and processing a television signal in an HDTV format, and having an output at which said television signal of said HDTV formal is developed, said HDTV tuner being responsive to a second control signal;

    user-operable data input circuitry adapted to receive user-entered data or commands;

    a controller responsive to said user-entered data or commands for generating said first and second control signals;

    memory circuitry coupled to said controller for storing data indicative of a pairing of a first television channel broadcasting in said HDTV format with a first television channel broadcasting in a conventional format, and a second television channel broadcasting in said HDTV format with a second television channel broadcasting in said conventional format;

    a picture-in-picture processor having an input coupled to said output of said conventional tuner and having an output at which picture-in-picture video signals are generated; and

    a further video processing unit for receiving said television signal in said HDTV format and for receiving said picture-in-picture video signals and producing a combined signal which when displayed on a display screen causes the display of a main image in HDTV format and an inset image in said conventional format;

    said controller, in response to the entering of a channel swap command via said user-operable data input circuitry when said first HDTV channel is tuned by said HDTV tuner for providing said main image and said second conventional television channel broadcasting in a said conventional format channel is tuned by said conventional tuner for providing said inset picture, causes tuning of said second HDTV channel for providing said main image and causes tuning of said first conventional channel for providing said inset picture.

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