| Patents for H03F 99 - Subject matter not provided for in other groups of this subclass (812) |
|---|
| 09/27/2006 | CN1277351C Class D amplifier |
| 09/20/2006 | EP1614216B1 Amplifier arrangement and distributed audio system |
| 09/19/2006 | US7110560 Electret condensor microphone preamplifier that is insensitive to leakage currents at the input |
| 09/14/2006 | DE102006002019A1 Variable-gain amplifier for regulating audio signals, e.g. for wireless headphones, controls response time based on level or difference in levels |
| 09/12/2006 | US7106135 Amplifier system and method |
| 08/29/2006 | US7099481 Method and system for automatically detecting and powering PC speakers |
| 08/22/2006 | US7095862 Headphone amplifier |
| 08/15/2006 | US7092530 Motor vehicle audio system |
| 08/08/2006 | US7088177 Amplifier apparatus |
| 08/01/2006 | US7085389 Infinite slope loudspeaker crossover filter |
| 07/27/2006 | WO2006078390A2 Portable multi-functional audio sound system and method therefor |
| 07/27/2006 | WO2006078378A2 Method and topology to switch an output stage in a class ab audio amplifier for wireless applications |
| 07/20/2006 | US20060159292 Method and topology to switch an output stage in a class ab audio amplifier for wireless applications |
| 07/20/2006 | US20060159291 Portable multi-functional audio sound system and method therefor |
| 07/20/2006 | US20060159290 Microphone and 2nd amplifier on and off foot switch |
| 07/12/2006 | EP1320927A4 Power amplification for parametric loudspeakers |
| 07/11/2006 | US7076070 Monolithic class D amplifier |
| 07/04/2006 | US7072478 Microphone preamplifier |
| 06/29/2006 | WO2006069325A2 Integrated booster amplifier |
| 06/22/2006 | US20060133625 Audio amplifier attachable to speaker system by way of magnetic coupler and method therefor |
| 06/22/2006 | US20060132234 Integrated booster amplifier |
| 06/20/2006 | US7064964 USB power amplified trumpet connecting device |
| 06/13/2006 | US7062336 Time-division method for playing multi-channel voice signals |
| 06/07/2006 | CN1784827A Distribution of radio-frequency signals in an electronic circuit |
| 06/06/2006 | US7057456 Class D amplifier |
| 06/01/2006 | US20060115101 Multiple amplifier synchronization system |
| 05/26/2006 | WO2006055783A1 Multiple amplifier synchronization system |
| 05/17/2006 | EP1656732A2 Harmonic generator and pre-amp |
| 05/16/2006 | US7046814 Impedance adapter preamplifier device for electronic tube audio frequencies able to be inserted on line on the path of the low frequency signal |
| 05/11/2006 | US20060097784 Amplifier apparatus |
| 05/09/2006 | US7043033 Mode control for audio amplifier coupling |
| 05/04/2006 | WO2005020432A3 Harmonic generator and pre-amp |
| 04/27/2006 | WO2006044548A2 Clopidogrel compositions |
| 04/13/2006 | WO2006038785A1 Apparatus and method for direct quadrature power amplifier modulation |
| 04/13/2006 | US20060078067 Apparatus and method for direct quadrature power amplifier modulation |
| 04/12/2006 | CN1759633A Transducer assembly with modifiable buffer circuit and method for adjusting thereof |
| 04/06/2006 | US20060074577 Multi channel multiplexed inspection system and method |
| 03/29/2006 | CN1752922A Sound card and method for limiting inputs to and outputs from sound card |
| 03/23/2006 | US20060062407 Sound card having feedback calibration loop |
| 03/09/2006 | US20060050902 Portable audio playing device |
| 03/09/2006 | US20060050901 Circuit and method for providing an auto-off and/or auto-on capabitity for an audio device |
| 03/09/2006 | US20060050900 Guitar amplifier with channel-dedicated power switching |
| 03/09/2006 | US20060049889 Digital pulse-width-modulation generator |
| 03/07/2006 | US7010131 Quasi-differential power amplifier and method |
| 03/02/2006 | WO2006022596A1 An amplifier apparatus and method |
| 03/02/2006 | US20060044063 Amplifier system and method |
| 03/01/2006 | CN1741370A An amplifier apparatus and method |
| 02/28/2006 | US7006645 Audio reproduction apparatus |
| 02/28/2006 | US7006643 Differential audio amplification system |
| 02/15/2006 | EP1625657A2 Distribution of radio-frequency signals in an electronic circuit |
| 02/15/2006 | CN1736023A Circuit and method for providing an auto-off and/or auto-on capability for an audio device |
| 02/09/2006 | DE102005033262A1 D-Klasse-Verstärker D-class amplifier |
| 02/02/2006 | WO2006011316A1 Amplifier circuit, semiconductor device and electronic apparatus |
| 01/31/2006 | US6993141 System for distributing a signal between loudspeaker drivers |
| 01/26/2006 | US20060018085 Apparatus for containing solid state electronic circuits and components and having the appearance of a vacuum tube |
| 01/24/2006 | US6989714 Class D amplifier |
| 01/19/2006 | US20060012428 Class-D amplifier |
| 01/18/2006 | CN1722613A Class-D amplifier |
| 01/11/2006 | EP1614216A1 Amplifier arrangement and distributed audio system |
| 12/07/2005 | EP1602260A2 Transducer assembly with modifiable buffer circuit and method for adjusting thereof |
| 11/22/2005 | US6967541 Digital pulse-width-modulation generator |
| 11/10/2005 | US20050249354 Method and system for operating accessory controls |
| 10/26/2005 | EP1588347A2 Circuit and method for providing an auto-off and/or auto-on capability for an audio device |
| 10/20/2005 | US20050232446 Trickle-charged amplifier |
| 10/20/2005 | US20050231281 Class D amplifier |
| 10/13/2005 | US20050225384 Class d amplifier |
| 09/29/2005 | WO2005091495A1 Method and system for amplifying and/or mixing or combining respectively signals, more particularly analog audio signals |
| 09/29/2005 | US20050213783 Transmission drive line for low level audio analog electrical signals |
| 09/15/2005 | US20050201573 Musical instrument audio amplifier circuit and system for producing distortion effects |
| 09/08/2005 | US20050195983 Method of analog math processing for controlled distortion of an electric audio signal and device |
| 08/18/2005 | WO2005076468A1 Amplifier and acoustic system |
| 08/10/2005 | CN1214521C VF impedance adapting amplifier device for low frequency with electronic tubes insertible on line of path of low frequency signal |
| 08/02/2005 | US6924700 Class D amplifier |
| 07/21/2005 | US20050156665 Class-D amplifier |
| 07/07/2005 | US20050147263 Loudspeaker system |
| 07/05/2005 | CA2273151C Efficient parallel-stage power amplifier |
| 05/26/2005 | US20050113947 Programmable system panel apparatus and method |
| 05/26/2005 | US20050112615 Controlling gene expression; nucleic acids; signal to noise ratio; stability; accuracy |
| 05/26/2005 | US20050111676 System panel programmer apparatus and method |
| 05/17/2005 | US6895096 Microchannel plate audio amplifier |
| 05/05/2005 | US20050094830 Current feedback system for improving crossover frequency response |
| 04/28/2005 | US20050089179 Car audio amplifier with remote control panel |
| 04/21/2005 | US20050084120 System, circuit, and amplifier for reducing pop sound |
| 04/05/2005 | US6876253 Amplifier for alternating signals superimposed on a continuous signal and method for amplifying such signals |
| 03/24/2005 | WO2004100359A3 Distribution of radio-frequency signals in an electronic circuit |
| 03/17/2005 | US20050058306 USB power amplfied trumpet connecting device |
| 03/10/2005 | WO2004082324A3 Transducer asembly with modifiable buffer circuit and method for adjusting thereof |
| 03/03/2005 | WO2005020432A2 Harmonic generator and pre-amp |
| 02/24/2005 | US20050041821 Harmonic generator and Pre-Amp |
| 02/17/2005 | US20050036635 Audio signal output device |
| 02/16/2005 | CN1581679A Audio-frequency signal output apparatus |
| 02/03/2005 | US20050025322 Pop and click reduction using DAC power up and power down processing |
| 02/02/2005 | CN1575037A Loudspeaker assembly |
| 12/30/2004 | US20040264717 Audio reproduction apparatus |
| 12/09/2004 | US20040247142 Learning amplifier for music |
| 12/08/2004 | CN1553596A predistorting device and method for pulse width modulating amplifier |
| 11/25/2004 | US20040234085 Portable audio amplifying apparatus for handheld multimedia devices and uses thereof |
| 11/24/2004 | CN1177407C Audio-frequency power amplifier apparatus and method thereof |
| 11/18/2004 | WO2004100359A2 Distribution of radio-frequency signals in an electronic circuit |
| 11/11/2004 | WO2004064026A3 Circuit and method for providing an auto-off and/or auto-on capability for an audio device |