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Sound field offset device

  • US 5,325,435 A
  • Filed: 06/10/1992
  • Issued: 06/28/1994
  • Est. Priority Date: 06/12/1991
  • Status: Expired due to Term
First Claim
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1. A sound field offset device having two channels, each of which comprises:

  • a frequency selection filter for dividing a stereophonic input signal into first and second frequency bands by a given frequency falling within an audio frequency, said first frequency band being higher than said given frequency, said second frequency band being lower than said given frequency;

    analog-to-digital converter means for converting a second frequency band output from said frequency selection filter into a digital signal;

    at least one digital filter for performing sound field offsetting with respect to an output of said analog-to-digital converter means;

    digital-to-analog converter means for converting an output of said digital filter into an analog signal;

    delay means for delaying a first frequency band output from said frequency selection filter;

    adder means for summing an output of said digital-to-analog converter means and an output of said delay means; and

    at least one loudspeaker assembly having a sharp directivity pattern for defining an area to which acoustic power is emitted within said first frequency band with a substantially uniform sound pressure level, the one loudspeaker assembly having an axis of directivity, wherein selection of said given frequency is substantially dictated by a sound pressure difference between a first listening point located on the axis of directivity and a second listening point off the axis of directivity and outside of said area.

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