Wireless digital audio music system

  • US 9,282,396 B2
  • Filed: 02/25/2013
  • Issued: 03/08/2016
  • Est. Priority Date: 12/21/2001
  • Status: Active Grant
First Claim
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1. A portable wireless digital audio system for digital transmission of an original audio signal representation from a portable audio source to a digital audio headphone, said audio signal representation representative of audio from said portable audio source, said portable wireless digital audio system comprising:

  • a portable digital audio spread spectrum transmitter configured to couple to said portable audio source and transmitting a unique user code bit sequence with said original audio signal representation in packet format, said digital audio spread spectrum transmitter comprising;

    an encoder operative to encode said original audio signal representation to reduce intersymbol interference and lowering signal detection error of said audio signal representation respective to said digital audio headphone and said digital audio spread spectrum transmitter; and

    a digital modulator configured for independent code division multiple access (CDMA) communication operation wherein said portable digital audio spread spectrum transmitter is in direct communication with said digital audio headphone, said digital audio headphone comprising;

    a direct conversion module configured to capture packets and the correct bit sequence embedded in the received spread spectrum signal and lowering signal detection error through reduced intersymbol interference coding respective of said digital audio headphone and said portable digital audio spread spectrum transmitter, the captured packets corresponding to the unique user code bit sequence;

    a digital demodulator configured for independent CDMA communication operation;

    a decoder operative to decode the applied reduced intersymbol interference coding of said original audio signal representation;

    a digital-to-analog converter (DAC) generating an audio output of said original audio signal representation; and

    a module adapted to reproduce said audio output, wherein each user has their headphone configured to communicate with their own separate digital audio spread spectrum transmitter, said audio having been wirelessly transmitted from said portable audio source through the digital audio spread spectrum transmitter configured to communicate with the headphone such that signals not originating from said portable digital audio spread spectrum transmitter are inaudible while operating in the portable wireless digital audio spread spectrum transmitter spectrum.

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