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Method and device for low-power FM transmission of audio data to RDS capable FM radio receiver

  • US 8,774,860 B2
  • Filed: 08/05/2005
  • Issued: 07/08/2014
  • Est. Priority Date: 04/05/2005
  • Status: Active Grant
First Claim
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1. A method performed by an apparatus, comprising:

  • scanning a frequency range to detect available radio frequencies on which no broadcast transmissions or interfering signals are currently received;

    storing detected available frequencies;

    selecting one of said stored frequencies;

    receiving audio data from an audio player;

    analyzing said audio data received from said audio player device to detect an audio volume;

    modulating said received audio data with frequency modulation;

    transmitting frequency modulated audio data on said selected frequency;

    interrupting the transmitting of said frequency modulated audio data, wherein said interrupting is performed if said audio volume falls below a pre-determined threshold;

    detecting if the frequency presently used for said transmitting is still available; and

    alternativelyif the frequency presently used is still available, resuming said transmitting of said audio data on the frequency presently used;

    orif the frequency presently used is not available anymoreselecting the at least one alternative frequency;

    switching to said selected alternative frequency; and

    resuming said transmitting of said audio data using said selected alternative frequency.

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