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Surround processor with antiphase blending and panorama control circuitry

  • US 5,307,415 A
  • Filed: 10/28/1992
  • Issued: 04/26/1994
  • Est. Priority Date: 06/08/1990
  • Status: Expired due to Term
First Claim
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1. Apparatus for a periphonic reproduction of sound on a plurality of loudspeakers derived from left and right audio input signals comprising left and right channel information respectively, said audio signals containing variable directional information, the apparatus comprising:

  • user-variable control circuitry for deriving from said left and right audio input signals first and third audio signals comprising left channel information and having a user adjustable level difference therebetween, and for deriving second and fourth audio signals comprising right channel information, a level difference therebetween the second and fourth audio signals is corresponding to the level difference between said first and third audio signals;

    panorama circuitry connected to said user-variable control circuitry for combining said first, second, third and fourth audio input signals to provide first and second variably cross-blended audio signals, such that said first variably cross-blended audio signal comprises left channel information mixed together with a variable proportion of right channel information and said second variably cross-blended audio signal comprises right channel information mixed together with the same variable proportion of left channel information, and such that said variable proportion is adjustable by said user-variable control circuitry to provide a desired amount of blending either in phase or in antiphase of said left and right channel information in each of said first and second variably cross-blended audio signals, thereby modifying the directional information contained therein derived from said variable directional information contained in said left and right channel information;

    input matrix circuitry connected to said panorama circuitry for providing a plurality of combination signals from said first and second variably cross-blended audio signals;

    variable matrixing circuitry connected to said input matrix circuitry, said variable matrixing circuitry responsive to said modified directional information contained in said combination audio signals to produce a plurality of output signals corresponding to said plurality of loudspeakers for said reproduction of sound, said combination audio signals being recombined in fixed and varying proportions with said varying proportions being varied in response to one or more control voltage signals; and

    circuitry connected to said panorama circuitry and said variable matrixing circuitry, said circuitry for generating said control voltage signals from directional information contained in said variably cross-blended audio signals.

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