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"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 8116511 | Earphone An earphone with adjustable impedance is provided. The earphone mainly includes an earphone body, a communication line, an earphone plug, an alter switch and an adjustable impedance unit used for adjusting an impedance of the earphone. The adjustable impedance unit ... | 02/14/2012 |
| 7177440 | Electromagnetic transducer with asymmetric diaphragm An electromagnetic transducer such as an audio speaker which includes an asymmetric diaphragm to deliver smooth frequency response with reduced distortion by reduction of common modes in the diaphragm. Other benefits such as asymmetric directivity patterns can be re... | 02/13/2007 |
| 6975741 | Electroacoustic transducer being acoustical tight in the area of its air gap for its moving coil A transducer (1) includes a transducer axis (2), a membrane (3), a magnet system (6) having an outer magnet system part (7) and an inner magnet system part (8), a moving coil configuration (27) connected to the membra... | 12/13/2005 |
| 5579398 | Electro-acoustic transducer This invention relates to electro-acoustic transducers such as is generally indicated at 10 and which comprise a body 11 defining a chamber 12, a plate 13 bearing a micro-phone or speaker 14 to which is attached a stalk 15, a diaphragm 16, connectable to ... | 11/26/1996 |
| 5537482 | Magnetic, variable-volume sound producing device A magnetic and variable-volume sound producing device which comprises a housing member, a substantially planar acoustic-producing diaphragm supported along its peripheral edge by the housing, a spiral, multi-turn and electrically conductive coil fixedly s... | 07/16/1996 |
| 4805221 | Construction of sound converter in sound guide, especially for loudspeakers, for example speaker boxes An installation of sound converters (e.g., speakers) in an enclosure having mechanical fasteners such that the transmission of solid-borne sound from the speakers to the enclosure is prevented.... | 02/14/1989 |
| 4518831 | Transducer with translationally adjustable armature An electromechanical magnetic transducer with a moving armature having (1) substantially pure translational adjustability, or (2) adjustability characterized by a substantially definite pre-chosen ratio of rotation to translation. The armature comprises a... | 05/21/1985 |
| 4380689 | Electroacoustic transducer for hearing aids An electroacoustic transducer is disclosed which is small in size so as to allow its use in hearing aids or like structure, but which maintains the performance characteristics of larger transducers. The transducer minimizes its cross-sectional dimensions ... | 04/19/1983 |
| 4345118 | Quartz tuning fork electro-acoustic transducer An acousto-electronic transducer includes an oscillator of quartz located in a sealed casing whose ceiling is constituted by a vibrant film, wherein the oscillator is connected to a pair of electrodes, and wherein the oscillator is connected to the vibran... | 08/17/1982 |
| 4327257 | Alignment device for electro-acoustical transducers An electro-acoustical transducer has a voice coil assembly, a diaphragm coupled to the voice coil, a permanent magnet arrangement for providing a magnetic field in an air gap, and support means for axially centering the voice coil assembly in the air gap ... | 04/27/1982 |
| 4239943 | Adjustable dual spider for a loudspeaker The present invention is an internal stabilizing spider-dust cap for use in combination with a loudspeaker that has an external centering spider and a surround mechanically coupling the conically shaped diaphragm of the loudspeaker to the frame thereof. T... | 12/16/1980 |
