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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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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