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7181025 |
Ultrasound based parametric loudspeaker system
A parametric loudspeaker system is described which is based upon the FM-modulation of an ultrasound carrier. Known systems work with AM-modulation. The FM-modulation produces a good matching to the...
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7134523 |
System for integrating mid-range and high-frequency acoustic sources in multi-way loudspeakers
This invention provides a radiation boundary integrator (“RBI”) for integrating sound radiation from mid-range and high-frequency sources in multi-way loudspeakers. The RBI is a substantially...
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7130438 |
Acoustic enclosure for single audio transducer
An acoustic enclosure for a single sound transducer has sound pressure apertures near the end where the transducer is located, and sound apertures in a wall at the other end. The sound apertures...
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6986260 |
Electrical fan system for vehicle
An electric fan system has a first electric blower 10, which utilizes a brushless motor, and a second electric blower, which utilizes a brushed motor, for distributing the cooling air to the...
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6931143 |
Thin enclosure electroacoustical transducing
An electroacoustical transducer has an enclosure having a thickness substantially smaller than the width and the depth. The transducer includes a first rigid sheet, a second rigid sheet, and a...
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6628790 |
Apparatus for on-ear operation and off-ear operation with two sound reproduction transducers
In an adapted to be used in an on-ear mode and in an off-ear mode a holder compartment ( 6 )accommodates a first transducer ( 20 )and a second transducer ( 25 )and the holder compartment ( 6 )is...
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6160897 |
Apparatus for operation in an on-ear mode and an off-ear mode
An apparatus (1) is constructed for operation in an on-ear mode and an off-ear mode and includes a housing wall (6) having passages (15) to allow useful sound waves to pass through, and additional...
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6116373 |
Acoustic horns for loudspeakers
An improved acoustic horn for loudspeakers is provided. The acoustic horn of the referred embodiment of the present invention includes a one piece body that incorporates damping material within the...
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5945642 |
Acoustic horn
An acoustic horn imparts energy at a selected wavelength, frequency, and amplitude. The horn has at least one nodal plane and a natural frequency of vibration. The horn has an outer surface and at...
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5837890 |
Jet engine test cell structure
A jet engine test cell capable of dissipating infrasound. The test cell includes an engine test section, an augmentor and an exhaust stack having a structure near its open end for dissipating...
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5740259 |
Pressure wave transducing
An electroacoustical transducing system for exchanging pressure wave energy with a medium that propagates pressure waves includes an electroacoustical transducer having a vibratile surface. At...
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5659155 |
Acoustical transducer enclosure
The purpose of the invention is to direct, in a coherent fashion, audible frequencies, particularly, low frequencies and especially those below 90 cycles. The advantage to directing low frequencies...
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5233136 |
Horn loadspeaker
A horn loudspeaker has an opening formed in a wall of a horn, and a tubular duct is provided along the horn and communicated with the opening. The length L of the duct is expressed as,...
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5179255 |
Baseball bat having the functions of resonators and microphones
A baseball bat having the functions of resonators and microphones is designed to be hollow and has a receiver cup disposed at its inner top end in such a manner that a spring may be hooked to its...
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5137110 |
Highly directional sound projector and receiver apparatus
An acoustic apparatus (10) adapted for use as either a sound projector or a ound receiver. The apparatus (10) comprises a bundle (20) of individual sound tubes (21, 22) disposed in a tube array...
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5115883 |
Loudspeaker
A horn shaped baffle is provided in the front of a loudspeaker. Escape holes are formed in the horn shaped baffle so as to emit sound waves deviated from the axis of the loudspeaker. A sound...
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4893695 |
Speaker system
A speaker system which has a speaker unit with a diaphragm and an acoustic path provided on the front side of the diaphragm so as to guide sound waves emitted from the diaphragm. The acoustic path...
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4619342 |
Multiple sound transducer system utilizing an acoustic filter to reduce distortion
The present invention relates to acoustic filters for use in combination with a multiple transducer system which includes a low frequency transducer subsystem and a high frequency transducer...
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4421957 |
End-fire microphone and loudspeaker structures
Highly directional response patterns can be obtained by connecting microphones or loudspeakers with tubular coupling path structures. The coupling paths comprise a plurality of elements (110,111 ....
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4419545 |
Electret transducer
An electret transducer comprising a diaphragm (3) arranged between first (1 or 1') and second electrodes with at least one electrode (2) arranged at some distance from the diaphragm as a stationary...
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4381831 |
High frequency horn
A loudspeaker horn is described, which produces good coupling of sound to the atmosphere, while avoiding perturbations in magnitude and phase that would produce large narrow-frequency losses or...
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4299304 |
Exponential folded horn speaker enclosure
An exponential folded horn loudspeaker enclosure is built so that all of its components are coaxial with respect to a line that is equidistant from three cooperating surfaces, including floor or...
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4283606 |
Coaxial loudspeaker system
The present invention is an acoustic filter for use in combination with a coaxial loudspeaker system which includes a low frequency loudspeaker and a high frequency speaker which is axially aligned...
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3944757 |
High-fidelity moving-coil loudspeaker
In a moving-coil type loudspeaker, a tubular member of a length longer than the wave-length of any one of the frequencies in a desired frequency range and having a constant cross-sectional area...
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3444955 |
DIRECTIONAL MICROPHONE WITH SUBSTANTIALLY FREQUENCY-INDEPENDENT DIRECTIONAL CHARACTERISTICS
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3174578 |
Contracted horns with least mouth reflection and some wall leakage
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2805728 |
Sound dispersion device with internal divergent acoustical lens
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2783851 |
Tone improving means
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