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Electroacoustical transducing with low frequency augmenting devices

  • US 20040105559A1
  • Filed: 03/07/2003
  • Published: 06/03/2004
  • Est. Priority Date: 12/03/2002
  • Status: Active Grant
First Claim
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1. A multimedia entertainment system, comprising a first and a second multimedia entertainment device, each comprising:

  • a first input terminal for receiving a first channel audio signal;

    a second input terminal for receiving an second channel audio signal;

    dynamic equalizing circuitry for dynamically equalizing said first channel audio signal and said second channel audio signal to provide a dynamically equalized first channel signal and a dynamically equalized second channel signal said dynamic equalizing circuitry comprising a first attenuator for attenuating a dynamic equalizer input audio signal by a variable factor G, where 0<

    G<

    1 to provide a first attenuated dynamic equalizer signal;

    a second attenuator for attenuating said dynamic equalizer input audio signal, by a variable factor 1−

    G to provide a second attenuated dynamic equalizer signal;

    an equalizer, for equalizing said first attenuated dynamic equalizer signal to provide an equalized first attenuated dynamic equalizer signal; and

    a dynamic equalizer combiner, for combining said equalized first attenuated dynamic equalizer signal with said second attenuated signal to provide a dynamic equalizer output signal;

    clipping and post-clipping processing circuitry for clipping said dynamically equalized first channel signal and said dynamically equalized second channel signal to provide a clipped first channel signal and a clipped second channel signal, said clipping and post clipping processing circuitry comprising a clipper, for clipping a clipper input audio signal to provide a clipped audio signal;

    a first clipper filter, for filtering said clipper input audio signal to provide a filtered unclipped audio signal;

    a second clipper filter for filtering said clipped audio signal to provide a filtered clipped audio signal;

    a first clipper combiner, for differentially combining said filtered clipped audio signal and said clipped audio signal to provide a differentially combined clipper audio signal; and

    a second clipper combiner for combining said filtered unclipped audio signal and said differentially combined audio signal to provide a clipper output signal;

    a first separator, for separating said first clipped first channel audio signal into a first channel high frequency signal and a first channel low frequency signal;

    a first separator, for separating said clipped first channel signal into a first channel high frequency signal and a first channel low frequency signal;

    a second separator, for separating said clipped second channel signal into a second channel high frequency signal and a second channel low frequency signal;

    a first processor, for processing said first channel high frequency signal to provide a processed first channel signal and a first channel canceling signal, wherein said first channel canceling signal is time-delayed and polarity inverted relative to said processed first channel signal;

    a second processor, for processing said second channel high frequency signal to provide a processed second channel signal and a second channel canceling signal, wherein said second channel canceling signal is time-delayed and polarity inverted relative to said processed second channel signal a first signal combiner, for combining said processed first channel signal and said first channel low frequency signal to provide a first channel output signal;

    a second signal combiner, for combining said first channel canceling signal and said first channel low frequency signal to provide a first channel canceling output signal;

    a third signal combiner, for combining said processed second channel signal and said second channel low frequency signal to provide a second channel output signal;

    a fourth signal combiner, for combining said second channel canceling signal and said second channel low frequency signal to provide a second channel canceling output canceling signal;

    a first electroacoustical transducer, for transducing said first channel output signal to provide a first channel sound wave;

    a second electroacoustical transducer, for transducing said first channel canceling output signal to provide a first channel canceling output sounds wave, wherein said first electroacoustical transducer and said second electroacoustical transducer are positioned such that said first channel canceling output sound wave destructively interferes in a first direction and does not destructively interfere in a second direction, wherein said second direction is toward a listening space associated with said multimedia entertainment device and wherein said first electroacoustical transducer and said second electroacoustical transducer are mounted in a low frequency augmenting device so that said first channel output sound wave and said first channel canceling sound wave are radiated into said low frequency augmenting device;

    a third electroacoustical transducer, for transducing said second channel output signal to provide a second channel sound wave;

    a fourth electroacoustical transducer, for transducing said second channel canceling output signal to provide a second channel canceling output sounds wave, wherein said third electroacoustical transducer and said fourth electroacoustical transducer are positioned such that said second channel canceling output sound wave destructively interferes in a third direction and does not destructively interfere in a fourth direction, wherein said fourth direction is toward a listening space associated with said multimedia entertainment device and wherein said third electroacoustical transducer and said fourth electroacoustical transducer are mounted in a low frequency augmenting device so that said second channel output sound wave and said second channel canceling sound wave are radiated into said low frequency augmenting device;

    circuitry for modifying said first channel output signal and said first channel output signal to modify the orientation of said first direction; and

    circuitry for modifying said second channel output signal and said second channel canceling output signal to modify the orientation of said third direction;

    a network, for communicatingly coupling said first and second multimedia entertainment devices.

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