Electroacoustical transducing
First Claim
1. A loudspeaker system comprising,an input for receiving an audio electrical signal;
- a first electroacoustical transducer constructed and arranged to radiate in a first direction for radiating first sound waves in a first frequency range in response to an audio electrical signal on said input;
a second electroacoustical transducer facing a second direction for radiating second sound waves;
a third transducer facing a third direction for radiating third sound waves;
a first low pass filter and a delay circuit coupling said input with said second transducer and said third transducer;
said first low pass filter for providing modified audio signals to said second transducer and to said third transducer,said delay circuits constructed and arranged so that said second sound waves are substantially out of phase with said first sound waves radiated in said second direction to buck said first sound waves in said second direction and so that said third sound waves are substantially out of phase with said first sound waves radiated in said third direction to buck said first sound waves in said third direction.
1 Assignment
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Accused Products
Abstract
Electroacoustical transducing apparatus includes an input for receiving an audio electrical signal. A first electroacoustical transducer is constructed and arranged to radiate first sound waves in a first direction in a first frequency range in response to an audio electrical signal on the input. A second electroacoustical transducer is constructed and arranged to radiate sound energy in a second direction in a second frequency range. A third electroacoustical transducer is constructed and arranged to radiate sound energy in a third direction within the second frequency range. Intercoupling circuitry intercouples the input with the second transducer and the third transducer and is constructed and arranged to cause the second transducer and the third transducer to radiate sound energy in the second and third directions in response to an audio electrical signal on the input relatively phased with respect to energy radiated in the second frequency range by the first transducer in the second and third directions in phase opposition therewith to oppose radiation in second and third directions from the first transducer within the second frequency range, the first frequency range being greater than and embracing the second frequency range.
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Citations
44 Claims
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1. A loudspeaker system comprising,
an input for receiving an audio electrical signal; -
a first electroacoustical transducer constructed and arranged to radiate in a first direction for radiating first sound waves in a first frequency range in response to an audio electrical signal on said input; a second electroacoustical transducer facing a second direction for radiating second sound waves; a third transducer facing a third direction for radiating third sound waves; a first low pass filter and a delay circuit coupling said input with said second transducer and said third transducer; said first low pass filter for providing modified audio signals to said second transducer and to said third transducer, said delay circuits constructed and arranged so that said second sound waves are substantially out of phase with said first sound waves radiated in said second direction to buck said first sound waves in said second direction and so that said third sound waves are substantially out of phase with said first sound waves radiated in said third direction to buck said first sound waves in said third direction. - View Dependent Claims (2, 3, 4, 5)
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6. A directional loudspeaker system comprising,
a first loudspeaker having a substantially dipole sound radiation pattern in a predetermined frequency range; -
a second loudspeaker having a substantially omnidirectional sound radiation pattern in said frequency range; wherein said first loudspeaker and said second loudspeaker are constructed and arranged so that radiation from said first and second loudspeakers cumulatively combine in a first direction and differentially combine in a second direction opposite to said first direction. - View Dependent Claims (7, 8)
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9. Multichannel audio reproduction apparatus, comprising,
an enclosure; -
a first audio channel signal input; a first transducer disposed in said enclosure and coupled to said first audio channel signal input for radiating first sound waves in response to a signal on said first audio channel signal input; a second transducer disposed in said enclosure for radiating second sound waves; a first signal modifier intercoupling said first audio channel signal input and said second transducer for providing a modified first signal to said second transducer such that said second sound waves substantially buck said first sound waves in a first direction; a second audio channel signal input; a third transducer disposed in said enclosure and coupled to said second audio channel signal input for radiating third sound waves in response to a signal on said second audio channel signal input; a fourth transducer, disposed in said enclosure for radiating fourth sound waves; a second signal modifier intercoupling said second audio channel signal input and said fourth transducer for providing a modified second signal to said fourth transducer such that said fourth sound waves buck said second sound waves in said first direction. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. Multichannel audio reproduction system, comprising,
a first transducer, a second transducer, a first audio channel signal input coupled to said first transducer so that said first transducer radiates first sound waves in response to a signal on said first audio channel signal input; -
a second audio channel signal input coupled to said second transducer so that said second transducer radiates second sound waves in response to a signal on said second audio channel signal input; a third transducer, a first signal modifier intercoupling said first audio channel signal input and said third transducer for providing a modified first channel signal to said third transducer; a second signal modifier intercoupling said second audio channel signal input and said third transducer for providing a modified second channel signal to said third transducer; wherein said third transducer radiates third sound waves that buck in a first direction said first sound waves and said second sound waves. - View Dependent Claims (21, 22, 23, 24)
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25. Multichannel audio reproduction system comprising,
a first source of a first channel signal, a first transducer facing a first direction coupled to said first source so that said first transducer radiates sound waves representative of said first channel signal; -
a second source of a second channel signal, a second transducer facing a second direction coupled to said second source so that said second transducer radiates sound waves representative of said second channel signal, a first signal modifier intercoupling said first source and said second transducer for providing a modified first channel signal to said second transducer such that said second transducer radiates sound waves that are representative of said first channel signal and that substantially reduce the amplitude of sound waves representative of said first channel signal radiated by said first transducer in said second direction. - View Dependent Claims (26, 27, 43)
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28. A loudspeaker system comprising,
an audio input for receiving an audio signal; -
a housing; a first transducer mounted in said housing, facing a first direction coupled to said audio input for radiating first sound waves representative of said audio signal; a second transducer mounted in said housing facing a second direction for radiating second sound waves; a delay circuit coupling said audio input to said second transducer delaying said audio signal so that said second waves are substantially out of phase with said first sound waves radiated in said second direction to oppose radiation of said first sound waves in said second direction, wherein said housing is adapted to be mounted on an acoustically reflective surface, wherein an axis of said first transducer intersects an axis of said second transducer at an angle significantly different from 180°
. - View Dependent Claims (29, 30, 31, 32)
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33. Electroacoustical transducing apparatus comprising,
an input for receiving an audio electrical signal, a first electroacoustical transducer constructed and arranged to radiate first sound waves in a first direction in a first frequency range in response to an audio electrical signal on said input, a second electroacoustical transducer constructed and arranged to radiate sound energy in a second direction in a second frequency range, a third electroacoustical transducer constructed and arranged to radiate sound energy in a third direction within said second frequency range, intercoupling circuitry intercoupling said input with said second transducer and said third transducer constructed and arranged to cause said second transducer and said third transducer to radiate sound energy in said second and third directions in response to an audio electrical signal on said input relatively phased with respect to energy radiated in said second frequency range by said first transducer in said second and third directions in phase opposition therewith to oppose radiation in second and third directions from said first transducer within said second frequency range, said first frequency range being greater than and embracing said second frequency range.
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40. Electroacoustical transducing apparatus comprising,
a first electroacoustical transducer that is an acoustic dipole and characterized by a figure-of-8 radiation pattern having first and second oppositely phased lobes in a first frequency range, and a second electroacoustical transducer having a substantially omnidirectional radiation pattern in said first frequency range and co-acting with said first electroacoustical transducer for providing cumulative combination with sound energy in one of said lobes and differential combination with sound energy in the other of said lobes.
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44. A multichannel audio reproduction system comprising,
a plurality of audio signal channels each associated with a corresponding direction of radiation, a corresponding plurality of electroacoustical transducers each having a maximum of radiation in a corresponding one of said radiation directions coupled to the audio signal channel associated with said direction of radiation, a corresponding plurality of signal modifiers each coupling a respective audio signal channel to at least one other of said electroacoustical transducers associated with a different direction, said multichannel audio reproduction system constructed and arranged so that radiation from each of said electroacoustical transducers is opposed by radiation from at least one other of said electroacoustical transducers in all but the maximum radiation direction of each transducer.
Specification