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Short range radio information system

  • US 5,199,108 A
  • Filed: 12/30/1988
  • Issued: 03/30/1993
  • Est. Priority Date: 12/30/1988
  • Status: Expired due to Fees
First Claim
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1. A low power AM band broadcast station, comprising:

  • an antenna;

    a transmitter;

    a tuning circuit coupled to said antenna and to said transmitter, wherein said tuning circuit has an inductor and a capacitor in parallel, wherein said tuning circuit matches the impedance of the transmitter with that of the antenna, and wherein the inductor is formed on a high magnetic permeability element to form a high-Q inductor;

    means coupled to said transmitter for controlling the frequency of a transmitted carrier signal;

    a modulator coupled to said transmitter for modulating the carrier signal in response to an applied electrical signal representing audio information;

    means for accepting an audio signal and converting it to a corresponding electrical signal;

    an A to D converter coupled to said accepting means for converting the electrical signal into digital form;

    a memory for storing the digital form of the electrical signal;

    a D to A converter coupled to said memory and to said modulator for converting the digital form to a second electrical signal and applying it to said modulator; and

    control means coupled to said memory and to said D to A converter for repeatedly reading the digital form of the electrical signal from said memory.

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