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Three-dimensional auditory display apparatus and method utilizing enhanced bionic emulation of human binaural sound localization

  • US 4,817,149 A
  • Filed: 01/22/1987
  • Issued: 03/28/1989
  • Est. Priority Date: 01/22/1987
  • Status: Expired due to Term
First Claim
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1. A three dimensional auditory display apparatus for selectively giving the illusion of sound localization to a listener comprisingmeans or receiving at least one multifrequency component, electronic input signal which is representative of one or more sound signals,front to back localization means for boosting the amplitudes of certain frequency components of the amplitudes of other frequency components of the input signal to selectively give the illusion that the sound source of the signal is positioned either ahead of or behind the listener and for thereby outputting the input signal with a front to back cue;

  • elevation localization means, including a variable notch filter, connected to the front to back localization means for selectively attenuating a selected frequency component of the front to back cued signal to give the illusion that the sound source of the signal is at a particular elevation with respect to the listener and to thereby output a signal to which a front to back cue and an elevational cue have been imparted; and

    azimuth localization means connected to the elevation localization means for generating two output signals corresponding to the front to back and elevation cued signal output from the elevation localization means, with one of the two output signals being delayed with respect to the other by a selected period of time to shift the apparent location of the sound source to the left or the right of the listener, the azimuth localization means further including elevation adjustment means for decreasing the time delay with increases in the apparent elevation of the sound source with respect to the listener, the azimuth location means being connected in series with the front to back localization means and the elevation localization means.

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