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Remote control transmitter with an audible battery life indicator

  • US 4,067,000 A
  • Filed: 05/28/1976
  • Issued: 01/03/1978
  • Est. Priority Date: 05/28/1976
  • Status: Expired due to Term
First Claim
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1. A remote control system comprising:

  • means for selecting a function to be controlled;

    means for generating an ultrasonic frequency electrical signal in accordance with the function selected;

    means for supplying energy to said ultrasonic frequency electrical signal generating means;

    means for detecting when the energy available from said energy supplying means falls below a predetermined level;

    means for generating an audio frequency electrical signal when the energy available from said energy supplying means has fallen below said predetermined level; and

    ultrasonic transducer means for normally generating an inaudible acoustic signal in response to said ultrasonic frequency electrical signal, said audio frequency signal having a predetermined frequency selected so that said ultrasonic transducer means generates an audible acoustic signal in response to said audio frequency electrical signal.

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