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Operation control circuit with secret code comparing means for remote control keypad

  • US 5,097,260 A
  • Filed: 08/21/1989
  • Issued: 03/17/1992
  • Est. Priority Date: 12/01/1988
  • Status: Expired due to Term
First Claim
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1. An operation control circuit for a remote control keypad having a key operating section, a microcomputer for outputting operation signals in accordance with the operation of said key operating section and an oscillator for supplying reference clocks to the microcomputer, for use with an audio and video apparatus, said operation control circuit comprising:

  • means for receiving the operational signals;

    display means coupled to said receiving means, for decoding said operation signals of said microcomputer, and for displaying said operation signals in a visual display;

    secret code comparing means coupled to said receiving means, for setting secret codes received from the key operating section and the microcomputer via said receiving means, and for comparing incoming codes received through said key operating section and the microcomputer with said secret codes; and

    gating means coupled to said secret code comparing means, for transmitting operation signals of said microcomputer to a remote control signal receiver of the audio and video apparatus when said incoming codes and said secret codes are found to correspond to each other by said secret code comparing means.

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