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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 |
| 7612793 |
Spatially correlated audio in multipoint videoconferencing |
Nov. 3, 2009 |
| 7509180 |
Extending digital rights management and authentication to audio speakers |
Mar. 24, 2009 |
| 7336794 |
High efficiency driver for miniature loudspeakers |
Feb. 26, 2008 |
| 7227966 |
Piezo-electric speaker |
Jun. 5, 2007 |
| 7106880 |
Universal ribbon element-module for two or more membrane-widths with optimized flow and drive |
Sep. 12, 2006 |
| 7089069 |
Method and apparatus for reconstruction of soundwaves from digital signals |
Aug. 8, 2006 |
| 6944306 |
Harmonic amplifier and corresponding electro-acoustic transducer |
Sep. 13, 2005 |
| 6904158 |
Speaker apparatus |
Jun. 7, 2005 |
| 6891286 |
Magnetostrictive actuator |
May. 10, 2005 |
| 6725109 |
Sound generator circuit system and method |
Apr. 20, 2004 |
| 6711269 |
Multifunction acoustic device |
Mar. 23, 2004 |
| 6707919 |
Driver control circuit |
Mar. 16, 2004 |
| 6639988 |
Piezo integrated flat speakers for automotive interior panels |
Oct. 28, 2003 |
| 6563929 |
Woofer having ornamental flashing lights |
May. 13, 2003 |
| 6476752 |
Signal processing system employing two bit ternary signal |
Nov. 5, 2002 |
| 6445804 |
Ultra-directional speaker system and speaker system drive method |
Sep. 3, 2002 |
| 6405092 |
Method and apparatus for amplifying and attenuating digital audio |
Jun. 11, 2002 |
| 6396933 |
High-fidelity and high-efficiency analog amplifier combined with digital amplifier |
May. 28, 2002 |
| 6263084 |
Power amplifier and loudspeaker frame integration |
Jul. 17, 2001 |
| 6243472 |
Fully integrated amplified loudspeaker |
Jun. 5, 2001 |
| 6208742 |
Electro-acoustic dynamic transducer system for use in a loud speaker |
Mar. 27, 2001 |
| 6160894 |
Speaker apparatus and sound reproduction system employing same |
Dec. 12, 2000 |
| 6154557 |
Acoustic transducer with selective driving force distribution |
Nov. 28, 2000 |
| 6028943 |
Audio amplifier system using a class D amplifier |
Feb. 22, 2000 |
| 5917922 |
Method of operating a single loud speaker drive system |
Jun. 29, 1999 |
| 5909496 |
Speaker apparatus |
Jun. 1, 1999 |
| 5862237 |
Speaker apparatus |
Jan. 19, 1999 |
| 5615272 |
Single loud speaker drive system |
Mar. 25, 1997 |
| 5613010 |
Apparatus for reproducing sound with a reduced dynamic range |
Mar. 18, 1997 |
| 5347587 |
Speaker driving device |
Sep. 13, 1994 |
| 5166982 |
Horn speaker having a cooling device |
Nov. 24, 1992 |
| 5097513 |
Speaker system enclosure integrated with amplifier circuit board |
Mar. 17, 1992 |
| 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 |
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