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Method and apparatus for three-dimensional audio display

  • US 7,231,054 B1
  • Filed: 09/24/1999
  • Issued: 06/12/2007
  • Est. Priority Date: 09/24/1999
  • Status: Expired due to Fees
First Claim
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1. A method for positioning of a plurality of audio signals, the method including:

  • selecting a set of spatial functions, each having an associated scaling factor;

    providing a first set of amplifiers and a second set of amplifiers, the gains of the amplifiers being functions of the scaling factors;

    receiving a first audio signal of the plurality of audio signals;

    providing a first direction representing the direction of the source of the first audio signal;

    adjusting the gains of the first and the second set of amplifiers depending on the first direction;

    applying the first set of amplifiers to the first audio signal to produce first encoded signals;

    delaying the first audio signal to produce a first delayed audio signal; and

    applying the second set of amplifiers to the first delayed audio signal to produce second encoded signals;

    providing a third set of amplifiers and a fourth set of amplifiers, the gains of the amplifiers being functions of the scaling factors;

    receiving a second audio signal of the plurality of audio signals;

    providing a second direction representing the direction of the source of the second audio signal;

    adjusting the gains of the third and the fourth set of amplifiers depending on the second direction;

    applying the third set of amplifiers to the second audio signal to produce third encoded signals;

    delaying the second audio signal to produce a second delayed audio signal;

    applying the fourth set of amplifiers to the second delayed audio signal to produce fourth encoded signals;

    mixing the first and the third encoded signals or the first and the fourth encoded signals to provide a left-channel audio output;

    mixing the second and the fourth encoded signals or the second and the third encoded signals to provide a right-channel audio output, the left-channel audio output excluding the second encoded signal and the right-channel audio output excluding the first encoded signal; and

    decoding the encoded signals using filters that are defined based on the spatial functions.

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