Head diffraction compensated stereo system with loud speaker array
First Claim
1. An audio processing system comprising:
- means for providing two input signals;
compensation means for introducing cross-talk cancellation in the two input signals including difference filter means for filtering a difference of the two input signals to obtain a first filtered signal and sum filter means for filtering a sum of the two input signals to obtain a second filtered signal; and
summing and differencing means for generating a sum output signal and a difference output signal respectively from the filtered signals, and for generating at least one additional different output signal from the filtered signals.
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Abstract
A stereo audio processing system for a stereo audio signal processing reproduction that provides improved source imaging and simulation of desired listening environment acoustics while retaining relative independence of listener movement. The system first utilizes a synthetic or artificial head microphone pickup and utilizes the results as inputs to a cross-talk cancellation and naturalization compensation circuit utilizing minimum phase filter circuits to adapt the head diffraction compensated signals for use as loudspeaker signals. The system provides for head diffraction compensation including cross-coupling while permitting listener movement by limiting the cross-talk cancellation and diffraction compensation to frequencies substantially below approximately ten kilohertz.
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Citations
50 Claims
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1. An audio processing system comprising:
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means for providing two input signals; compensation means for introducing cross-talk cancellation in the two input signals including difference filter means for filtering a difference of the two input signals to obtain a first filtered signal and sum filter means for filtering a sum of the two input signals to obtain a second filtered signal; and summing and differencing means for generating a sum output signal and a difference output signal respectively from the filtered signals, and for generating at least one additional different output signal from the filtered signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An audio processing method comprising the steps of:
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providing two input signals; introducing crosstalk cancellation in the two input signals including difference filtering a difference of the two input signals to obtain a first filtered signal and sum filtering of a sum of the two input signals to obtain a second filter signal; generating a sum output signal and a difference output signal respectively from the filtered signals and at least one additional output signal from the filtered signals. - View Dependent Claims (14, 15, 16, 17)
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18. An audio processing system comprising:
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means for providing two input signals; compensation means for introducing crosstalk cancellation in the two input signals including difference filter means for filtering a difference of the two input signals to obtain a first filtered signal, sum filter means for filtering a sum of the two input signals to obtain a second filtered signal, and means for separately and differently filtering each of the two input signals before combining and filtering to obtain a third filtered signal; and means for producing output signals directly from at least two of the filtered signals.
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19. An audio processing system comprising:
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means for providing two input signals; compensation means for introducing crosstalk cancellation in the two input signals for use with a symmetric loudspeaker array including difference filter means for filtering a difference of the two input signals to obtain a first filtered signal and sum filter means for filtering a sum of the two input signals to obtain a second filtered signals; means for producing two side loudspeaker outputs from only one of the filtered signals; and means for producing a center loudspeaker output. - View Dependent Claims (20, 21, 22, 23)
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24. An audio processing method comprising the steps of:
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providing two inputs; introducing crosstalk cancellation in the two input signals including filtering a difference of the two input signals to obtain a first filtered signal and filtering a sum of the two input signals to obtain a second filtered signal; producing first and second loudspeaker outputs from one of the filtered signals; generating a third loudspeaker output from the other filtered signal. - View Dependent Claims (25, 26, 27, 28)
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29. An audio processing system comprising:
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means for providing two input signals; compensation means for introducing crosstalk cancellation in the two input signals for use with a dipole loudspeaker arrayed sym,etrically with a monopole loudspeaker including difference filter means for filtering a difference of the two input signals to obtain a first filtered signal and sum filter means for filtering a sum of the two input signals to obtain a second filtered signal; means for producing a dipole loudspeaker output signal from the first filtered signal and for producing a monopole loudspeaker output signal from the second filtered signal. - View Dependent Claims (30, 31, 32, 33)
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34. An audio processing system comprising;
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means for providing two input signals; compensation means for introducing crosstalk cancellation in the two input signals for use with a symmetric loudspeaker array having outer loudspeakers and an inner loudspeaker including difference filter means for filtering a difference of the two input signals to obtain a first filtered signal and sum filter means for filtering a sum of the two input signals to obtain a second filtered signal; summing and differencing means for generating a sum output signal and a difference output signal from said first and second filtered signals wherein the sum output signal is supplied to the inner loudspeakers of the array, and wherein the difference output signal is supplied to the outer loudspeaker of the array.
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35. An audio processing method comprising the steps of:
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providing two input signals; introducing crosstalk cancellation in the two input signals for use with a dipole loudspeaker arrayed symmetrically with a monopole loudspeaker including filtering a difference of the two input signals to obtain a first filtered signal and filtering a sum of the two input signals to obtain a second filtered signal; producing a dipole loudspeaker output from the first filtered signal and producing a monopole loudspeaker output from the second filtered signal. - View Dependent Claims (36, 37, 38)
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39. An audio processing method for use with a symmetric loudspeaker array having outer loudspeakers and an inner loudspeaker comprising the steps of:
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providing two input signals; introducing crosstalk cancellation in the two input signals including filtering a difference of the two input signals to obtain a first filtered signal and filtering a sum of the two input signals to obtain a second filtered signal; generating a sum output and a difference output from the first filtered signal and the second filtered signal; supplying the sum output to the outer loudspeakers of the array and supplying the difference output signal to the inner loudspeaker of the array.
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40. An audio processing system comprising;
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means for providing two input signals; compensation means for introducing crosstalk cancellation in the two input signals including means for producing a difference signal and a sum signal from the two input signals; means for filtering to form a first filtered signal derived from the difference signal and means for filtering the sum signal to form a second filtered signal; and output means for forming a sum output signal and a difference output signal from the first and second filtered signals. - View Dependent Claims (41, 42, 43, 44)
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45. The audio processing method comprising the steps of:
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providing two input signals; introducing crosstalk cancellation in the two input signals including producing a difference signal and a sum signal from the two input signals; filtering to form a first filtered signal derived from the difference signal and filtering the sum signal to form a second filtered signal; forming an output sum signal and output difference signal from the first and second filtered signals. - View Dependent Claims (46, 47, 48, 49)
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50. An audio processing system comprising:
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means for providing two input signals; compensation means for introducing crosstalk cancellation in the two input signals for use with a symmetric loudspeaker array having a first set of loudspeakers displaced from at least one additional loudspeaker including difference filter means for filtering a difference of the two input signals to obtain a first filtered signal and sum filter means for filtering a sum of the two input signals to obtain a second filtered signal; summing and differencing means for generating a sum output signal and a difference output signal from said first and second filtered signals wherein the sum output signal is supplied to the first set of loudspeakers of the array, and wherein the difference output signal is supplied to at least one additional loudspeaker of the array.
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Specification