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Class Information
Number: 381/100
Name: Electrical audio signal processing systems and devices > Including frequency control > Having crossover filter > With active device
Description: Subject matter having an electrical or electronic element capable of controlling voltages or currents to produce gain or switching action in a circuit (e.g., transistor, vacuum tube, or saturable reactor).
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7577263 |
System for audio signal processing |
Aug. 18, 2009 |
| 7542815 |
Extraction of left/center/right information from two-channel stereo sources |
Jun. 2, 2009 |
| 7409066 |
Method of adjusting filter parameters and an associated playback system |
Aug. 5, 2008 |
| 7406144 |
Clock generator circuit using phase modulation technology and method thereof |
Jul. 29, 2008 |
| 7085389 |
Infinite slope loudspeaker crossover filter |
Aug. 1, 2006 |
| 6975733 |
Watermarking of digital images using wavelet and discrete cosine transforms |
Dec. 13, 2005 |
| 6931135 |
Frequency dependent excursion limiter |
Aug. 16, 2005 |
| 6707919 |
Driver control circuit |
Mar. 16, 2004 |
| 6665408 |
Dynamic bass control circuit with variable cut-off frequency |
Dec. 16, 2003 |
| 6411717 |
Switched capacitor filter with a neutral bypass setting |
Jun. 25, 2002 |
| 6396934 |
Analog audio filter for high frequencies |
May. 28, 2002 |
| 6310959 |
Tuned order crossover network for electro-acoustic loudspeakers |
Oct. 30, 2001 |
| 6201873 |
Loudspeaker-dependent audio compression |
Mar. 13, 2001 |
| 5737432 |
Split-band clipper |
Apr. 7, 1998 |
| 5675656 |
Power amplifier with clipping level control |
Oct. 7, 1997 |
| 5548650 |
Speaker excursion control system |
Aug. 20, 1996 |
| 5533135 |
Crossover system |
Jul. 2, 1996 |
| 5495527 |
Telephone privacy device |
Feb. 27, 1996 |
| 5384855 |
Audio system for vehicular application |
Jan. 24, 1995 |
| 5361381 |
Dynamic equalizing of powered loudspeaker systems |
Nov. 1, 1994 |
| 5349301 |
Multiple amplifier system for a car |
Sep. 20, 1994 |
| 5325435 |
Sound field offset device |
Jun. 28, 1994 |
| 5245278 |
Device for the processing of a signal coming from a sensor with a derivative type of response |
Sep. 14, 1993 |
| 5237619 |
Sound mixer with band separation |
Aug. 17, 1993 |
| 5168526 |
Distortion-cancellation circuit for audio peak limiting |
Dec. 1, 1992 |
| 5146506 |
Isolator circuit for an audio system |
Sep. 8, 1992 |
| 5129006 |
Electronic audio signal amplifier and loudspeaker system |
Jul. 7, 1992 |
| 5129005 |
Electrodynamic loudspeaker |
Jul. 7, 1992 |
| 5111508 |
Audio system for vehicular application |
May. 5, 1992 |
| 5004067 |
Cinema sound system for unperforated screens |
Apr. 2, 1991 |
| 4991221 |
Active speaker system and components therefor |
Feb. 5, 1991 |
| 4905284 |
Audio system for vehicular applications |
Feb. 27, 1990 |
| 4856065 |
Power fader for a loudspeaker system |
Aug. 8, 1989 |
| 4771466 |
Multidriver loudspeaker apparatus with improved crossover filter circuits |
Sep. 13, 1988 |
| 4633501 |
Program dependent crossover filter (PDC) |
Dec. 30, 1986 |
| 4589135 |
Zero phase shift filtering |
May. 13, 1986 |
| 4583245 |
Speaker system protection circuit |
Apr. 15, 1986 |
| 4567607 |
Stereo image recovery |
Jan. 28, 1986 |
| 4525857 |
Crossover network |
Jun. 25, 1985 |
| 4426552 |
Speaker distortion compensator |
Jan. 17, 1984 |
| 4412100 |
Multiband signal processor |
Oct. 25, 1983 |
| 4329902 |
Electronic method and apparatus for modifying musical sound |
May. 18, 1982 |
| 4137510 |
Frequency band dividing filter |
Jan. 30, 1979 |
| 4100371 |
Loudspeaker system with phase difference compensation |
Jul. 11, 1978 |
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