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Class Information
Number: 381/353
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > Acoustic enclosure > Acoustic damping or attenuating resonator
Description: Subject matter in which a) the acoustic properties of a cavity are used to compensate for mechanical shock, i.e., to effectively cancel transmission of the shock to the transducer"s output, or b) the resonant property of a cavity is used to absorb or attenuate sound at a particular frequency or over a band of frequencies.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6104823 |
Speaker system |
Aug. 15, 2000 |
| 6064746 |
Piezoelectric speaker |
May. 16, 2000 |
| 5974157 |
Small electroacoustic transducer |
Oct. 26, 1999 |
| 5923769 |
Electroacoustic transducer |
Jul. 13, 1999 |
| 5815589 |
Push-pull transmission line loudspeaker |
Sep. 29, 1998 |
| 5479520 |
Loudspeaker system |
Dec. 26, 1995 |
| 5261006 |
Loudspeaker system comprising a helmholtz resonator coupled to an acoustic tube |
Nov. 9, 1993 |
| 5150417 |
Bass reflex type speaker system |
Sep. 22, 1992 |
| 5109422 |
Acoustic apparatus |
Apr. 28, 1992 |
| 5012890 |
Acoustic apparatus |
May. 7, 1991 |
| 4987601 |
Acoustic apparatus |
Jan. 22, 1991 |
| 4898260 |
Loudspeaker mounting with integral back wave filter and wave modulating plate of same design |
Feb. 6, 1990 |
| 4817168 |
Directional microphone |
Mar. 28, 1989 |
| 4443667 |
Electromagnetic transducer |
Apr. 17, 1984 |
| 4401859 |
Directional microphone with high frequency selective acoustic lens |
Aug. 30, 1983 |
| 4379212 |
Electro-acoustic transducer |
Apr. 5, 1983 |
| 4376232 |
Electro-acoustic transducer |
Mar. 8, 1983 |
| 4363937 |
Sound inlet for microphones |
Dec. 14, 1982 |
| 4317965 |
Thin miniaturized dynamic-type loudspeaker |
Mar. 2, 1982 |
| 4224469 |
Stereo speaker system |
Sep. 23, 1980 |
| 4189627 |
Electroacoustic transducer filter assembly |
Feb. 19, 1980 |
| 4147899 |
Broadband electromagnetic sound source with differently tuned diaphragms |
Apr. 3, 1979 |
| 3989905 |
Microphone |
Nov. 2, 1976 |
| 3953675 |
Audio speaker system |
Apr. 27, 1976 |
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