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Playback devices

  • US 3,918,801 A
  • Filed: 10/02/1973
  • Issued: 11/11/1975
  • Est. Priority Date: 10/03/1972
  • Status: Expired due to Term
First Claim
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1. In a motion-picture projector having reading means for concurrently reproducing the contents of a picture strip and a sound strip respectively stored in a pair of associated cassettes, in combination:

  • a manually loadable cassette holder receivable in the body of the projector for accommodating a picture cassette and a sound cassette in operative juxtaposition with said reading means upon insertion of said holder into said body, said cassettes being provided with distinctive markings in predetermined code positions;

    first and second sensing means positioned to detect said markings of said picture and sound cassettes, respectively;

    comparison means responsive to said first and second sensing means upon insertion of said holder into said body for ascertaining the presence of a predetermined correlation between the code markings of said picture and sound cassettes; and

    signaling means connected to said comparison means for indicating the absence of said correlation.

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