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Class Information
Number: 381/28
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic > Amplifier
Description: Subject matter including a device to increase the amplitude of the independent sound signals.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7579958 |
Audio power meter |
Aug. 25, 2009 |
| 7477752 |
Loudspeaker system |
Jan. 13, 2009 |
| 7110555 |
Sound signal reproducing apparatus |
Sep. 19, 2006 |
| 7085387 |
Sound system and method for capturing and reproducing sounds originating from a plurality of sound sources |
Aug. 1, 2006 |
| 6762641 |
Voltage level translation circuits |
Jul. 13, 2004 |
| 6529787 |
Multimedia computer speaker system with bridge-coupled subwoofer |
Mar. 4, 2003 |
| 6448719 |
Apparatus and method for pulsating lights in response to an audio signal |
Sep. 10, 2002 |
| 6421447 |
Method of generating surround sound with channels processing separately |
Jul. 16, 2002 |
| 6181796 |
Method and system which drives left, right, and subwoofer transducers with multichannel amplifier having reduced power supply requirements |
Jan. 30, 2001 |
| 6038324 |
Automotive surround sound circuit background of the invention |
Mar. 14, 2000 |
| 6028945 |
Interchangeable amplifier device |
Feb. 22, 2000 |
| 6026168 |
Methods and apparatus for automatically synchronizing and regulating volume in audio component systems |
Feb. 15, 2000 |
| 6011852 |
Audio power amplifier device for micro-computers |
Jan. 4, 2000 |
| 5970153 |
Stereo spatial enhancement system |
Oct. 19, 1999 |
| 5920229 |
Power amplifier apparatus |
Jul. 6, 1999 |
| 5914636 |
Balanced power audio amplification system |
Jun. 22, 1999 |
| 5912975 |
Method and circuit for creating phantom sources using phase shifting circuitry |
Jun. 15, 1999 |
| 5889867 |
Stereophonic Reformatter |
Mar. 30, 1999 |
| 5856759 |
Audio output amplifier with parallel class AB stages |
Jan. 5, 1999 |
| 5815219 |
Large screen video display system and television receiver |
Sep. 29, 1998 |
| 5787182 |
Audio signal amplifier circuit and a portable audio equipment using the same |
Jul. 28, 1998 |
| 5771296 |
Audio circuit |
Jun. 23, 1998 |
| 5742691 |
Surround sound converter |
Apr. 21, 1998 |
| 5717766 |
Stereophonic sound reproduction apparatus using a plurality of loudspeakers in each channel |
Feb. 10, 1998 |
| 5673326 |
Audio bass speaker driver circuit |
Sep. 30, 1997 |
| 5668339 |
Apparatus for multiplexing an audio signal in a video-song playback system |
Sep. 16, 1997 |
| 5666422 |
Remote speaker for surround-sound applications |
Sep. 9, 1997 |
| 5655025 |
Circuit for automatically recognizing and receiving mono and stereo audio signals |
Aug. 5, 1997 |
| 5610555 |
Low-voltage driven, audio signal amplifying apparatus and a portable acoustic system using said apparatus |
Mar. 11, 1997 |
| 5546468 |
Portable speaker and amplifier unit |
Aug. 13, 1996 |
| 5535281 |
Analog integrated circuit |
Jul. 9, 1996 |
| 5515445 |
Long-time balancing of omni microphones |
May. 7, 1996 |
| 5509078 |
Circuit for preventing crosstalk |
Apr. 16, 1996 |
| 5469509 |
Car audio system with high signal output |
Nov. 21, 1995 |
| 5414774 |
Circuit and method for controlling an audio system |
May. 9, 1995 |
| 5400410 |
Signal separator |
Mar. 21, 1995 |
| 5386474 |
Amplifier-speaker interface correction circuit |
Jan. 31, 1995 |
| 5361381 |
Dynamic equalizing of powered loudspeaker systems |
Nov. 1, 1994 |
| 5343534 |
Sequential audio switcher |
Aug. 30, 1994 |
| 5343531 |
Audio reproducing apparatus |
Aug. 30, 1994 |
| 5332976 |
Sound signal amplifier with low power dissipation |
Jul. 26, 1994 |
| 5307415 |
Surround processor with antiphase blending and panorama control circuitry |
Apr. 26, 1994 |
| 5305388 |
Bass compensation circuit for use in sound reproduction device |
Apr. 19, 1994 |
| 5263087 |
Time constant processing circuit for surround processor |
Nov. 16, 1993 |
| 5243656 |
Audio circuit |
Sep. 7, 1993 |
| 5228085 |
Perceived sound |
Jul. 13, 1993 |
| 5222150 |
Volume control circuit |
Jun. 22, 1993 |
| 5218643 |
Audio system for vehicle |
Jun. 8, 1993 |
| 5200709 |
Audio amplifying circuit |
Apr. 6, 1993 |
| 5199079 |
Supply voltage responsive audible transient (POP) suppression arrangement |
Mar. 30, 1993 |
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