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Low power system and method for communicating audio information to patrons having portable radio receivers

  • US 4,165,487 A
  • Filed: 04/10/1978
  • Issued: 08/21/1979
  • Est. Priority Date: 04/10/1978
  • Status: Expired due to Term
First Claim
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1. A system for communicating audio information to a plurality of patrons of an establishment, each of the patrons having a portable radio receiver, said system comprising in combination:

  • (a) means for producing a radio frequency carrier signal;

    (b) means for producing audio frequency electrical signals representative of information to be communicated to the patrons;

    (c) means for amplifying said audio frequency electrical signals;

    (d) means for modulating the amplitude of said carrier signal by said amplified audio frequency electrical signals to produce an output signal;

    (e) means for amplifying said output signal;

    (f) means for transmitting said amplified output signal to said radio receivers by applying said amplified output signal to an antenna located proximately to the portion of the establishment wherein the patrons and their radio receivers are located during communication of said audio information;

    (g) conductor means for conducting said output signal to a tuning location in the establishment; and

    (h) tuning aid means connected to said conductor means at said tuning location for radiating a low power amplitude modulated radio frequency signal of the same carrier frequency as said output signal at substantially lower field intensity then said amplified output signal to enable the patrons of the establishment to conveniently tune their portable radio receivers to said carrier frequency by holding their portable radio receivers close to said tuning aid means and adjusting the tuning controls of their portable radio receivers to obtain maximum sound levels.

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