Acoustic transducer array signal processing
First Claim
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1. An apparatus comprising:
- first and second arrays of transducers; and
filters to operate on a first input signal to provide output signals and cross-feed signals to the transducers of the first and second arrays so that(a) a combination of a plurality of transducers of the first array produces destructive interference in a first frequency range;
(b) the combination of the plurality of transducers of the first array does not produce destructive interference in a second frequency range; and
(c) a combination of a first transducer of the first array and a first transducer of the second array produces destructive interference in the second frequency range and does not produce destructive interference in the first frequency range.
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Abstract
A set of filters is configured to distribute input signals representing a single perceptual axis to first and second physically separate arrays of loudspeakers comprising at least first and second transducers, such that the arrays of loudspeakers will create an array pattern corresponding to the input signals when the input signals are between a first frequency and a second frequency.
24 Citations
44 Claims
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1. An apparatus comprising:
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first and second arrays of transducers; and filters to operate on a first input signal to provide output signals and cross-feed signals to the transducers of the first and second arrays so that (a) a combination of a plurality of transducers of the first array produces destructive interference in a first frequency range; (b) the combination of the plurality of transducers of the first array does not produce destructive interference in a second frequency range; and (c) a combination of a first transducer of the first array and a first transducer of the second array produces destructive interference in the second frequency range and does not produce destructive interference in the first frequency range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method comprising
filtering input signals and distributing the filtered signals as output signals and cross-feed signals to first and second physically separate arrays of transducers to drive transducers of the first and second arrays so that (a) a combination of the plurality of transducers of the first array produces destructive interference in a first frequency range; -
(b) the combination of the plurality of transducers of the first array does not produce destructive interference in a second frequency range; and (c) a combination of a first transducer of the first array and a first transducer of the second array produces destructive interference in the second frequency range and does not produce destructive interference in the first frequency range. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. An apparatus comprising:
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first and second arrays of transducers; and filters to operate on an input signal to provide output signals and cross-feed signals to drive transducers of the first and second arrays so that (a) a combination of a plurality of transducers of the first array produces substantially different degrees of destructive interference in respectively first and second frequency ranges; and (b) a combination of a transducer of the first array and a transducer of the second array produces destructive interference in the second frequency range and does not produce destructive interference in the first frequency range; in which first signals driving the first array and second signals driving the second array are not identical.
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44. An apparatus comprising:
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filters to operate on an input signal to provide output signals and cross-feed signals to drive transducers of first and second arrays so that (a) a combination of a plurality of transducers of the first array produces destructive interference in a first frequency range; (b) the combination of the plurality of the transducers of the first array does not produce destructive interference in a second frequency range; and (c) a combination of a transducer of the first array and a transducer of the second array produces destructive interference in the second frequency range and does not produce destructive interference in the first frequency range.
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Specification