| Patents for H03F 99 - Subject matter not provided for in other groups of this subclass (812) |
|---|
| 12/09/2009 | CN100568714C Electronic circuit for distribution of radio-frequency signals |
| 12/08/2009 | US7630505 Loudspeaker system |
| 11/26/2009 | US20090290728 Dynamic contoured-sound/subwoofer-synthesis audio system |
| 11/26/2009 | US20090289704 Amplification circuit for driving a diffuser |
| 11/19/2009 | US20090285416 Speaker Driver Circuit Driven By Postive and Negative Voltages |
| 11/18/2009 | EP2119305A2 Audio system with synthesized positive impedance |
| 10/21/2009 | CN100553126C Controller of radio-frequency power generator for reducing sensitivity to cable length |
| 10/15/2009 | US20090257601 Acoustic speaker system with strong bass capability |
| 10/13/2009 | US7602927 Guitar amplifier with channel-dedicated power switching |
| 10/01/2009 | US20090245541 Audio Power Amplifier with Feedback-Shifting Technology |
| 10/01/2009 | US20090245540 Amplification circuit and method therefor |
| 10/01/2009 | US20090243816 Monitor with reminder sound |
| 09/24/2009 | US20090238382 Audio reproduction system |
| 09/24/2009 | US20090238372 Vertically or horizontally placeable combinative array speaker |
| 09/17/2009 | US20090232331 Amplifier controller |
| 09/17/2009 | US20090231031 High-impedance level-shifting amplifier capable of handling input signals with a voltage magnitude that exceeds a supply voltage |
| 09/16/2009 | CN100542075C Predistorting device and method for pulse width modulating amplifier |
| 09/03/2009 | WO2008085173A8 Electronic bass register musical instrument tube preamplifier |
| 08/13/2009 | US20090202087 Wireless Microphone Device |
| 08/06/2009 | US20090196439 Articulated amplifier |
| 08/06/2009 | US20090195711 Tactile Signal Transfer Arrangement |
| 08/05/2009 | CN100525076C Amplifier apparatus and method |
| 07/30/2009 | US20090190651 Pwm signal generator, pwm signal generating device, and digital amplifier |
| 07/23/2009 | US20090185696 Sound signal transmitter-receiver |
| 07/22/2009 | CN101488730A Amplifier, audio system and input signal amplification method |
| 07/16/2009 | US20090180640 Headphone amplifier circuit |
| 07/15/2009 | CN100514849C Class-D amplifier |
| 07/02/2009 | US20090169022 Systems and methods for improved over-current clipping |
| 06/30/2009 | US7554400 Integrator and error amplifier |
| 06/24/2009 | CN100505520C Amplifier circuit, semiconductor device and electronic apparatus |
| 06/18/2009 | US20090154733 Amplifier circuit and methods of operation thereof |
| 06/18/2009 | US20090154732 Audio playing module and method of the same |
| 06/18/2009 | US20090153339 Method and apparatus for boosting an audible signal in a notification system |
| 06/10/2009 | CN100499355C Audio-frequency signal output apparatus |
| 06/04/2009 | US20090141911 Acoustic processing device and acoustic processing method |
| 06/02/2009 | US7542551 Cordless telephone handset |
| 05/07/2009 | US20090115635 Detection and classification of running vehicles based on acoustic signatures |
| 04/30/2009 | US20090110217 Digital/Analogue conversion apparatus |
| 04/30/2009 | US20090110206 Method and apparatus for sensing a signal absence of audio and automatically entering low power mode |
| 04/29/2009 | EP2052456A1 Integrator and error amplifier |
| 04/23/2009 | WO2007014053A3 High sensitivity rfid tag integrated circuits |
| 04/15/2009 | EP2047594A1 Passive amplification of signals |
| 04/09/2009 | WO2009046359A2 Detection and classification of running vehicles based on acoustic signatures |
| 04/09/2009 | US20090092267 Switching audio power amplifier with de-noise function |
| 04/08/2009 | EP1588347B1 Circuit and method for providing an auto-off and/or auto-on capability for an audio device |
| 04/01/2009 | CN100474759C Circuit and method for providing an auto-off and/or auto-on capability for an audio device |
| 03/31/2009 | US7511572 High-impedance level-shifting amplifier capable of handling input signals with a voltage magnitude that exceeds a supply voltage |
| 03/12/2009 | WO2008109327A3 Audio system with synthesized positive impedance |
| 03/10/2009 | US7501886 Low distortion class-D amplifier |
| 03/05/2009 | US20090060229 Wireless system for sharing audio signal |
| 02/18/2009 | EP1787386A4 An amplifier apparatus and method |
| 02/11/2009 | CN100461629C A digital phase-lock amplifier |
| 01/15/2009 | DE112007000623T5 Zwei-Draht-Mikrofonschaltung Two-wire microphone circuit |
| 01/14/2009 | EP1839378A4 Method and topology to switch an output stage in a class ab audio amplifier for wireless applications |
| 01/06/2009 | US7474757 Circuit and method for providing an auto-off and/or auto-on capability for an audio device |
| 12/18/2008 | US20080310654 Circuit for processing sound signals |
| 12/18/2008 | US20080310653 Digital audio signal amplifier |
| 12/11/2008 | US20080304680 Sound Generating Device |
| 12/11/2008 | DE102008025203A1 Speichermodul Memory module |
| 12/04/2008 | US20080301370 Memory Module |
| 12/04/2008 | US20080298608 Sound Generating Device with Removable Memory |
| 11/27/2008 | DE102008023919A1 Schaltung zum Bearbeiten von Klangsignalen Circuit for processing sound signals |
| 11/19/2008 | EP1656732A4 Harmonic generator and pre-amp |
| 11/13/2008 | US20080279399 Power Control Apparatus, Speaker Apparatus and Power Control Method |
| 11/13/2008 | US20080279392 Reducing sound pressure of noise |
| 11/05/2008 | EP1988623A2 D. c. converter, speaker apparatus and d. c. converter control method |
| 11/05/2008 | CN101299548A Power control apparatus, speaker apparatus and power control method |
| 10/30/2008 | WO2008128315A1 Digital audio horn |
| 10/30/2008 | WO2007108929A3 Two-wire microphone circuit |
| 10/30/2008 | US20080267429 Modular Speaker System |
| 10/30/2008 | US20080267428 Digital audio horn |
| 10/30/2008 | CA2682071A1 Digital audio horn |
| 10/23/2008 | US20080260179 Active loudspeaker |
| 10/08/2008 | EP1978637A2 Flat-panel television and audio equipment |
| 10/07/2008 | US7432761 Amplifier circuit, semiconductor device and electronic apparatus |
| 10/02/2008 | US20080240469 Flat-panel television and audio equipment |
| 10/02/2008 | US20080240468 Landscape speaker connector and sound system |
| 09/25/2008 | US20080232614 Sound amplifier with speaker |
| 09/24/2008 | CN101271682A Sound amplifier with speaker |
| 09/23/2008 | US7428311 Method and apparatus for boosting an audible signal in a notification system |
| 09/18/2008 | US20080226100 Microphone Amplification Arrangement and Integrated Circuit Therefor |
| 09/12/2008 | WO2008109327A2 Audio system with synthesized positive impedance |
| 09/10/2008 | EP1320927B1 Power amplification for parametric loudspeakers |
| 09/04/2008 | US20080212818 Audio system with synthesized positive impedance |
| 09/04/2008 | US20080212804 Sound receiver |
| 09/02/2008 | US7420413 Amplifier circuit of BTL system |
| 08/28/2008 | US20080205672 Semiconductor integrated circuit and amplifier for suppressing pop sound while minimizing voltage transition settling time |
| 08/28/2008 | US20080204111 High-impedance level-shifting amplifier capable of handling input signals with a voltage magnitude that exceeds a supply voltage |
| 08/14/2008 | WO2008097758A1 Hybrid filter for audio switching amplifier |
| 08/14/2008 | US20080192960 Hybrid Filter for Audio Switching Amplifier |
| 08/12/2008 | US7412064 Presence control for guitar amplifier |
| 07/23/2008 | CN101228809A 声音接收装置 Sound receiving means |
| 07/17/2008 | WO2008085173A1 Electronic bass register musical instrument tube preamplifier |
| 07/17/2008 | US20080170724 Vocal monitor |
| 07/10/2008 | US20080165990 Sound Card Having Feedback Calibration Loop |
| 07/03/2008 | US20080159567 Audio amplifier circuit and electronic apparatus including the same |
| 06/26/2008 | US20080150628 Low distortion class-D amplifier |
| 06/19/2008 | US20080144865 M-bridge class-d audio amplifier |
| 06/19/2008 | US20080144861 Method and apparatus for controlling a selectable voltage audio power output stage |
| 06/17/2008 | US7388959 Harmonic generator and pre-amp |