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Class Information
Number: 381/117
Name: Electrical audio signal processing systems and devices > Circuitry combined with specific type microphone or loudspeaker > With magnetic loudspeaker
Description: Subject matter where the transducer is a magnetic loudspeaker.










Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
5003609 Whole-surface driven speaker Mar. 26, 1991
4995113 Device for processing an audio-frequency electrical signal Feb. 19, 1991
4937874 Emulated guitar loudspeaker Jun. 26, 1990
4829582 Electrodynamic transducer May. 9, 1989
4727583 Telephone transducer with improved frequency response Feb. 23, 1988
4675835 Device for compensating reproduction errors in an electroacoustic transducer Jun. 23, 1987
4653103 Loudspeaker structure and system Mar. 24, 1987
4612420 Loudspeaker system for converting a digitized electric signal into an acoustic signal Sep. 16, 1986
4592087 Class D hearing aid amplifier May. 27, 1986
4584438 Percussion air motor Apr. 22, 1986
4566120 Loudspeaker system and loudspeaker for use in a loud-speaker system for converting an n-bit digitized electric signal into an acoustic signal Jan. 21, 1986
4564727 Subwoofer speaker system Jan. 14, 1986
4555797 Hybrid loudspeaker system for converting digital signals to acoustic signals Nov. 26, 1985
4531025 Loudspeaker with commutated coil drive Jul. 23, 1985
4504704 Loudspeaker system Mar. 12, 1985
4464785 Loudspeaker system Aug. 7, 1984
4461932 Ribbon type speaker and method of assembling magnetic circuit thereof Jul. 24, 1984
4426556 Electrodynamic loudspeaker Jan. 17, 1984
4387270 Method of harmonizing the impedances of an audio amplifier and loudspeaker interconnected therewith Jun. 7, 1983
4360707 Digitally driven combination coils for electrodynamic acoustic transducers Nov. 23, 1982
4340778 Speaker distortion compensator Jul. 20, 1982
4338489 Headphone construction Jul. 6, 1982
4287389 High-fidelity speaker system Sep. 1, 1981
4243838 Stiffness variation device Jan. 6, 1981
4229618 High-fidelity speaker with negative feedback Oct. 21, 1980
4201886 Plural concentric moving coil speaker with push-pull voltage follower direct coupling May. 6, 1980
4130725 Split-coil speaker with direct coupling Dec. 19, 1978
4037051 Flat baffle speaker system having improved crossover Jul. 19, 1977

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