Inverse horn loudspeakers
First Claim
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1. A loudspeaker system with an inverse horn enclosure comprising:
- at least one electro-acoustical transducer mounted in a transducer opening on the horn enclosure, the electro-acoustical transducer comprising a moveable diaphragm for converting an electrical input signal into a corresponding acoustic output at a pressure;
a first compression chamber comprising the transducer opening, a first internal volume that receives the acoustic output from the diaphragm, and a first exit, wherein the first internal volume is configured to increase the pressure of the acoustic output from the diaphragm towards the first exita second compression chamber comprising a second entrance and a second exit, the second entrance directly acoustically connected to the first exit of the first compression chamber, and the second compression chamber having a second internal volume smaller than or equal to the first internal volume;
a third compression chamber comprising a third entrance and a third exit, the third entrance directly acoustically connected to the second exit of the second compression chamber, and the third compression chamber having a third internal volume smaller than or equal to the second internal volume, the third exit of the third compression chamber acoustically coupled to a last exit;
a resonance-distortion filter chamber comprising a filter chamber internal volume and a filter chamber opening acoustically connecting the filter chamber to one of the compression chambers, the resonance distortion filter chamber having a resonant tuning frequency Fr, that is higher than a fundamental tuning frequency Fb; and
the last exit acoustically coupled to the external environment.
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Abstract
In a low frequency transducer system a multi-compression chamber, inverse horn structure is employed in combination with a resonance-distortion filter chamber. The filter chamber effectively expands the effective enclosure volume at low frequencies and connected to one of the compression chambers filter parasitic resonances and distortion and allowing the system to more efficiently reproduce low frequencies while being able to use smaller diameter transducers and maintaining good system sensitivity. Compression chambers are organized for constant or continuous compression on a section-by-section basis throughout the inverse horn system.
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Citations
26 Claims
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1. A loudspeaker system with an inverse horn enclosure comprising:
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at least one electro-acoustical transducer mounted in a transducer opening on the horn enclosure, the electro-acoustical transducer comprising a moveable diaphragm for converting an electrical input signal into a corresponding acoustic output at a pressure; a first compression chamber comprising the transducer opening, a first internal volume that receives the acoustic output from the diaphragm, and a first exit, wherein the first internal volume is configured to increase the pressure of the acoustic output from the diaphragm towards the first exit a second compression chamber comprising a second entrance and a second exit, the second entrance directly acoustically connected to the first exit of the first compression chamber, and the second compression chamber having a second internal volume smaller than or equal to the first internal volume; a third compression chamber comprising a third entrance and a third exit, the third entrance directly acoustically connected to the second exit of the second compression chamber, and the third compression chamber having a third internal volume smaller than or equal to the second internal volume, the third exit of the third compression chamber acoustically coupled to a last exit; a resonance-distortion filter chamber comprising a filter chamber internal volume and a filter chamber opening acoustically connecting the filter chamber to one of the compression chambers, the resonance distortion filter chamber having a resonant tuning frequency Fr, that is higher than a fundamental tuning frequency Fb; and the last exit acoustically coupled to the external environment. - 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)
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24. A loudspeaker system with an inverse horn enclosure comprising:
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at least one electro-acoustical transducer mounted in a transducer opening on the horn enclosure, the electro-acoustical transducer comprising a moveable diaphragm for converting an electrical input signal into a corresponding acoustic output at a pressure; a first compression chamber comprising the transducer, a first internal volume that receives the acoustic output from the diaphragm, and a first exit, wherein the first internal volume is configured to increase the pressure of the acoustic output from the diaphragm towards the first exit; a plurality of linearly attached compression chambers, each compression chamber comprising an entrance and an exit, the first of such entrances acoustically connected to the first exit of the first compression chamber, each exit attached to the entrance of each subsequent compression chamber, wherein at least one of the plurality of the compression chambers increases the pressure of the acoustic output from a previous compression chamber, wherein a last exit of a last one of the plurality of compression chambers is acoustically coupled to the external environment, and a resonance distortion filter chamber comprising a filter internal volume and a filter entrance acoustically connecting the filter chamber to one of the compression chambers, the filter chamber having a resonant tuning frequency Fr that is higher than a fundamental tuning frequency Fb. - View Dependent Claims (25, 26)
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Specification