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Class Information
Number: 333/28T
Name: Wave transmission lines and networks > Coupling networks > Equalizers > Audio tone control
Description:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7577263 |
System for audio signal processing |
Aug. 18, 2009 |
| 7409067 |
Method and apparatus for adjusting frequency characteristic of signal |
Aug. 5, 2008 |
| 7388959 |
Harmonic generator and pre-amp |
Jun. 17, 2008 |
| 7266205 |
Linearized filter band equipment and processes |
Sep. 4, 2007 |
| 6791433 |
Signal processing by means of resonators |
Sep. 14, 2004 |
| 6751323 |
Electroacoustic apparatus having ringing signal generation means capable of producing a subjective bass perception |
Jun. 15, 2004 |
| 6587566 |
Sound field forming circuit and sound field forming apparatus |
Jul. 1, 2003 |
| 6396934 |
Analog audio filter for high frequencies |
May. 28, 2002 |
| 6317117 |
User interface for the control of an audio spectrum filter processor |
Nov. 13, 2001 |
| RE37223 |
Dynamic equalizing |
Jun. 12, 2001 |
| 6101257 |
Audio signal processor |
Aug. 8, 2000 |
| 6088460 |
Equalizer and audio device using the same |
Jul. 11, 2000 |
| 5987065 |
Adaptive equalizer |
Nov. 16, 1999 |
| 5982907 |
Audio signal waveform emphasis processing device and method |
Nov. 9, 1999 |
| 5974156 |
Circuit arrangement for influencing the frequency response of a digital audio signal |
Oct. 26, 1999 |
| 5949821 |
Method and apparatus for correcting phase and gain imbalance between in-phase (I) and quadrature (Q) components of a received signal based on a determination of peak amplitudes |
Sep. 7, 1999 |
| 5754668 |
Equalizer and audio device using the same |
May. 19, 1998 |
| 5727074 |
Method and apparatus for digital filtering of audio signals |
Mar. 10, 1998 |
| 5714918 |
Equalizer for digitized signals |
Feb. 3, 1998 |
| 5692051 |
Electronic equalization for recessed loudspeaker mounting |
Nov. 25, 1997 |
| 5539833 |
Audio signal amplifier device |
Jul. 23, 1996 |
| 5530769 |
Equalizer and audio device using the same |
Jun. 25, 1996 |
| 5524290 |
Adaptive graphic equalizer and radio using same |
Jun. 4, 1996 |
| 5509080 |
Bass clipping circuit |
Apr. 16, 1996 |
| 5459791 |
Audio frequency filter |
Oct. 17, 1995 |
| 5327102 |
Sound recording apparatus |
Jul. 5, 1994 |
| 5305388 |
Bass compensation circuit for use in sound reproduction device |
Apr. 19, 1994 |
| 5297075 |
Computer controlled transversal equalizer |
Mar. 22, 1994 |
| 5282252 |
Audio equalizer providing reciprocal equalization plus infinite-depth notch |
Jan. 25, 1994 |
| 5210806 |
Digital audio signal processing apparatus |
May. 11, 1993 |
| 5201009 |
Signal processor |
Apr. 6, 1993 |
| 5091956 |
Adaptive high pass filter having cut-off frequency controllable responsive to input signal and operating method therefor |
Feb. 25, 1992 |
| 5050217 |
Dynamic noise reduction and spectral restoration system |
Sep. 17, 1991 |
| 5046105 |
Audio signal equalizer having accelerated slope phase shift compensated filters |
Sep. 3, 1991 |
| 4994770 |
Tone control device |
Feb. 19, 1991 |
| 4972489 |
Sound reproducing apparatus |
Nov. 20, 1990 |
| 4955058 |
Apparatus and method for equalizing a soundfield |
Sep. 4, 1990 |
| 4939782 |
Self-compensating equalizer |
Jul. 3, 1990 |
| 4891841 |
Reciprocal, subtractive, audio spectrum equalizer |
Jan. 2, 1990 |
| 4888808 |
Digital equalizer apparatus enabling separate phase and amplitude characteristic modification |
Dec. 19, 1989 |
| 4845758 |
Equalizer with adjustable band filters and a digital filter suitable for use in the equalizer |
Jul. 4, 1989 |
| 4809337 |
Audio noise gate |
Feb. 28, 1989 |
| 4797933 |
Bass amplifier with high frequency response |
Jan. 10, 1989 |
| 4785475 |
Apparatus and method for equalizing a soundfield |
Nov. 15, 1988 |
| 4759065 |
Automotive sound system |
Jul. 19, 1988 |
| 4739514 |
Automatic dynamic equalizing |
Apr. 19, 1988 |
| 4633189 |
NF tone control circuit |
Dec. 30, 1986 |
| 4633501 |
Program dependent crossover filter (PDC) |
Dec. 30, 1986 |
| 4566119 |
Equalizer networks and methods of developing scaling coefficients therefor |
Jan. 21, 1986 |
| 4538298 |
Fixed bandpass tone controlling |
Aug. 27, 1985 |
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