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Class Information
Number: 381/120
Name: Electrical audio signal processing systems and devices > With amplifier
Description: Subject matter including a device for producing an output of greater amplitude than is applied at an input.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7623669 |
Simplified amplifier providing sharing of music with enhanced spatial presence through multiple headphone jacks |
Nov. 24, 2009 |
| 7602927 |
Guitar amplifier with channel-dedicated power switching |
Oct. 13, 2009 |
| 7584009 |
Multi-chip PWM synchronization and communication |
Sep. 1, 2009 |
| 7564304 |
Audio power amplifier apparatus |
Jul. 21, 2009 |
| 7564982 |
Two channel audio surround sound circuit |
Jul. 21, 2009 |
| 7548630 |
Integrated loudspeaker system |
Jun. 16, 2009 |
| 7542578 |
Condenser microphone |
Jun. 2, 2009 |
| 7522735 |
Electronic circuit with spring reverberation effect and improved output controllability |
Apr. 21, 2009 |
| 7505600 |
Processor control of an audio transducer |
Mar. 17, 2009 |
| 7477752 |
Loudspeaker system |
Jan. 13, 2009 |
| 7474757 |
Circuit and method for providing an auto-off and/or auto-on capability for an audio device |
Jan. 6, 2009 |
| 7472048 |
Direct digital drive audio system and method |
Dec. 30, 2008 |
| 7472289 |
Audio noise mitigation for power state transitions |
Dec. 30, 2008 |
| 7459978 |
Ground skimming output stage |
Dec. 2, 2008 |
| 7459968 |
Audio power amplifier IC and audio system provided with the same |
Dec. 2, 2008 |
| 7433477 |
Audio superpositioning |
Oct. 7, 2008 |
| 7428311 |
Method and apparatus for boosting an audible signal in a notification system |
Sep. 23, 2008 |
| 7412064 |
Presence control for guitar amplifier |
Aug. 12, 2008 |
| 7388959 |
Harmonic generator and pre-amp |
Jun. 17, 2008 |
| 7362871 |
Audio amplifier circuit and audio IC having the same |
Apr. 22, 2008 |
| 7340272 |
Mobile communication terminal having a three-dimensional surround sound effect and its control method |
Mar. 4, 2008 |
| 7321661 |
Current feedback system for improving crossover frequency response |
Jan. 22, 2008 |
| 7302063 |
Audio system for an automobile |
Nov. 27, 2007 |
| 7254244 |
Pop and click reduction using DAC power up and power down processing |
Aug. 7, 2007 |
| 7221766 |
Microphone input buffer biasing circuit |
May. 22, 2007 |
| 7215788 |
Digital loudspeaker |
May. 8, 2007 |
| 7194097 |
Audio control device |
Mar. 20, 2007 |
| 7184561 |
Electronic apparatus having audio output units |
Feb. 27, 2007 |
| 7171011 |
Acoustic drive circuit |
Jan. 30, 2007 |
| 7158843 |
Modular software definable pre-amplifier |
Jan. 2, 2007 |
| 7158646 |
Signal derived bias supply for electrostatic loudspeakers |
Jan. 2, 2007 |
| 7155020 |
Audio circuitry for dynamics reduction |
Dec. 26, 2006 |
| 7149316 |
Microcontroller having an on-chip high gain amplifier |
Dec. 12, 2006 |
| 7149317 |
CMOS high impedance circuit |
Dec. 12, 2006 |
| 7146194 |
Amplifying circuit, speaker system, and mobile information terminal employing amplifying circuit |
Dec. 5, 2006 |
| 7146015 |
Frequency threshold audio activity detector |
Dec. 5, 2006 |
| 7123729 |
Dual use of an integrated circuit pin and the switching of signals at said pin |
Oct. 17, 2006 |
| 7123730 |
Audio power amplifying apparatus and method |
Oct. 17, 2006 |
| 7110560 |
Electret condensor microphone preamplifier that is insensitive to leakage currents at the input |
Sep. 19, 2006 |
| 7106135 |
Amplifier system and method |
Sep. 12, 2006 |
| 7103189 |
Power supply noise immunity for audio amplifier |
Sep. 5, 2006 |
| 7099481 |
Method and system for automatically detecting and powering PC speakers |
Aug. 29, 2006 |
| 7095862 |
Headphone amplifier |
Aug. 22, 2006 |
| 7092533 |
BTL amplifier apparatus |
Aug. 15, 2006 |
| 7092534 |
Method and system for reducing pop noise of a sound broadcasting instrument |
Aug. 15, 2006 |
| 7092530 |
Motor vehicle audio system |
Aug. 15, 2006 |
| 7085389 |
Infinite slope loudspeaker crossover filter |
Aug. 1, 2006 |
| 7076070 |
Monolithic class D amplifier |
Jul. 11, 2006 |
| 7072478 |
Microphone preamplifier |
Jul. 4, 2006 |
| 7062336 |
Time-division method for playing multi-channel voice signals |
Jun. 13, 2006 |
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