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Class Information
Number: 381/99
Name: Electrical audio signal processing systems and devices > Including frequency control > Having crossover filter
Description: Subject matter that separates a signal into two or more separate frequency bands.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7418104 |
Speaker system |
Aug. 26, 2008 |
| 7409066 |
Method of adjusting filter parameters and an associated playback system |
Aug. 5, 2008 |
| 7409067 |
Method and apparatus for adjusting frequency characteristic of signal |
Aug. 5, 2008 |
| 7397924 |
Modular loudspeaker |
Jul. 8, 2008 |
| 7392880 |
Dual range horn with acoustic crossover |
Jul. 1, 2008 |
| 7321661 |
Current feedback system for improving crossover frequency response |
Jan. 22, 2008 |
| 7315624 |
Stream segregation for stereo signals |
Jan. 1, 2008 |
| 7302067 |
Audio system for a computer |
Nov. 27, 2007 |
| 7257231 |
Stream segregation for stereo signals |
Aug. 14, 2007 |
| 7242783 |
Audio limiting circuit |
Jul. 10, 2007 |
| 7164770 |
Surround sound speaker system |
Jan. 16, 2007 |
| 7139402 |
Sound reproduction device |
Nov. 21, 2006 |
| 7116790 |
Loudspeaker |
Oct. 3, 2006 |
| 7088827 |
Reconfigurable speaker system |
Aug. 8, 2006 |
| 7085389 |
Infinite slope loudspeaker crossover filter |
Aug. 1, 2006 |
| 7027605 |
Mid-range loudspeaker |
Apr. 11, 2006 |
| 7003124 |
System and method for adjusting frequency response characteristics of high-pass crossovers supplying signal to speakers used with subwoofers |
Feb. 21, 2006 |
| 6993141 |
System for distributing a signal between loudspeaker drivers |
Jan. 31, 2006 |
| 6983053 |
Method of selecting a frequency band of an output audio signal by a computer |
Jan. 3, 2006 |
| 6950524 |
Optimal source distribution |
Sep. 27, 2005 |
| 6940987 |
Techniques for improving audio clarity and intelligibility at reduced bit rates over a digital network |
Sep. 6, 2005 |
| 6931139 |
Computer audio system |
Aug. 16, 2005 |
| 6854005 |
Crossover filter system and method |
Feb. 8, 2005 |
| 6834113 |
Loudspeaker system |
Dec. 21, 2004 |
| 6804361 |
Sound signal playback machine and method thereof |
Oct. 12, 2004 |
| 6775385 |
Loudspeaker frequency distribution and adjusting circuit |
Aug. 10, 2004 |
| 6771784 |
Sub woofer system |
Aug. 3, 2004 |
| 6760446 |
Point source speaker system |
Jul. 6, 2004 |
| 6691073 |
Adaptive state space signal separation, discrimination and recovery |
Feb. 10, 2004 |
| 6687379 |
System and method for adjusting the low-frequency response of a crossover that supplies signal to subwoofers in response to main-speaker low-frequency characteristics |
Feb. 3, 2004 |
| 6674866 |
Audio reproduction apparatus |
Jan. 6, 2004 |
| 6674864 |
Adaptive speaker compensation system for a multimedia computer system |
Jan. 6, 2004 |
| 6633648 |
Loudspeaker array for enlarged sweet spot |
Oct. 14, 2003 |
| 6606388 |
Method and system for enhancing audio signals |
Aug. 12, 2003 |
| 6587682 |
Signal routing for reduced power consumption in a conferencing system |
Jul. 1, 2003 |
| 6438237 |
3D woofer drive circuit |
Aug. 20, 2002 |
| 6381334 |
Series-configured crossover network for electro-acoustic loudspeakers |
Apr. 30, 2002 |
| 6363157 |
Multiple element electroacoustic transducing |
Mar. 26, 2002 |
| 6359994 |
Portable computer expansion base with enhancement speaker |
Mar. 19, 2002 |
| 6310959 |
Tuned order crossover network for electro-acoustic loudspeakers |
Oct. 30, 2001 |
| 6281749 |
Sound enhancement system |
Aug. 28, 2001 |
| 6169812 |
Point source speaker system |
Jan. 2, 2001 |
| 6115475 |
Capacitor-less crossover network for electro-acoustic loudspeakers |
Sep. 5, 2000 |
| 6081602 |
Arrayable two-way loudspeaker system and method |
Jun. 27, 2000 |
| 5937072 |
Audio crossover circuit |
Aug. 10, 1999 |
| 5930374 |
Phase coherent crossover |
Jul. 27, 1999 |
| 5917922 |
Method of operating a single loud speaker drive system |
Jun. 29, 1999 |
| 5901231 |
Piezo speaker for improved passenger cabin audio systems |
May. 4, 1999 |
| 5887068 |
Multi-driver in-phase bipolar array loudspeaker |
Mar. 23, 1999 |
| 5821470 |
Broadband acoustical transmitting system |
Oct. 13, 1998 |
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