| Patents for H03F 99 - Subject matter not provided for in other groups of this subclass (812) |
|---|
| 02/24/2015 | US8965011 Automatic gain control circuit and method for automatic gain control |
| 02/24/2015 | US8963634 Load current sensing |
| 02/17/2015 | US8958577 System, method, and apparatus for adjusting an output of a transducer |
| 02/17/2015 | US8958575 Amplifier with configurable DC-coupled or AC-coupled output |
| 02/10/2015 | US8954177 Controlling operation of a media device based upon whether a presentation device is currently being worn by a user |
| 01/27/2015 | US8942391 Distortion compensation |
| 01/22/2015 | DE102008023919B4 Schaltung zum Bearbeiten von Klangsignalen Circuit for processing sound signals |
| 01/13/2015 | US8934647 Orientation-responsive acoustic driver selection |
| 01/06/2015 | US8929060 Audio visual enhancement apparatus |
| 12/11/2014 | US20140363028 Method and system for controlling amplifiers |
| 12/09/2014 | US8908887 Multi-channel class-D audio amplifier with planar inductors |
| 12/09/2014 | US8908886 Power amplifying apparatus and audio system |
| 11/25/2014 | US8897467 Capacitive load driving amplifier |
| 11/18/2014 | US8890608 Digital input class-D audio amplifier |
| 11/04/2014 | US8879754 Sound reproducing system with superimposed digital signal |
| 10/21/2014 | US8867761 Multi-tier power supply for audio amplifiers |
| 10/21/2014 | US8866547 Dynamic headroom for envelope tracking |
| 10/14/2014 | US8861751 Audio processing apparatus |
| 10/14/2014 | US8861748 Amplifier and amplifier control method |
| 10/09/2014 | US20140301576 Adjustable audio splitter |
| 10/07/2014 | US8855335 Distortion suppression in high-level capable audio amplification circuit |
| 10/07/2014 | US8855328 Earpiece and a method for playing a stereo and a mono signal |
| 09/30/2014 | US8848947 Low-noise microphone pre-amplifier with active load element |
| 09/30/2014 | US8848945 Audio amplifier with closed-loop power |
| 09/30/2014 | US8848944 Low powered guitar amplifer with or without attenuator |
| 09/25/2014 | WO2014151092A1 Automatic multi-channel music mix from multiple audio stems |
| 09/23/2014 | US8842860 Apparatus and method for outputting sound in mobile terminal |
| 09/23/2014 | US8842855 Sound volume control circuit |
| 09/02/2014 | US8824701 Determining automatic gain control levels |
| 08/26/2014 | US8816760 Capacitor amplifying circuit and operating method thereof |
| 07/22/2014 | US8787598 Dynamic contoured-sound/subwoofer-synthesis audio system |
| 07/15/2014 | US8781139 Speaker system and speaker driving circuit |
| 06/17/2014 | CA2498392C Audio system with balance setting based on information addresses |
| 06/05/2014 | US20140154981 Quadrature hybrid coupler, amplifier, and wireless communication device |
| 05/15/2014 | WO2014071474A1 Portable sound device for amplifying sound from stringed musical instruments and the like |
| 05/13/2014 | US8724831 Amplification circuit and method therefor |
| 05/01/2014 | US20140119573 System and Method for Capacitive Signal Source Amplifier |
| 04/22/2014 | US8706444 Method for accurately acquiring multiple analog input signals, analog input circuit, and measuring sensor and measuring transducer having an analog input circuit of this type |
| 04/22/2014 | US8705773 Audio amplifier |
| 04/17/2014 | US20140105425 Acoustic Amplification Device |
| 04/08/2014 | US8693708 System for operating a device for producing an audible alarm |
| 04/03/2014 | US20140093103 Increasing ground noise rejection in audio systems |
| 04/01/2014 | US8687826 Amplifier circuit |
| 03/20/2014 | US20140079249 Speaker control system |
| 03/20/2014 | US20140079246 Distortion Limiter and Automatic Power Control for Drivers |
| 03/18/2014 | US8675894 Audio console system |
| 02/27/2014 | US20140056444 Amplifying device |
| 02/25/2014 | US8660277 Amplifier circuit and methods of operation thereof |
| 02/20/2014 | US20140050336 Audio Amplification Apparatus |
| 02/18/2014 | US8654991 Audio signal amplifier circuit |
| 02/11/2014 | US8649532 Electronic volume circuit |
| 01/23/2014 | US20140022084 Audio system surround acoustic driver powering |
| 01/07/2014 | US8625820 Amplifier circuit audio circuit and electronic device |
| 01/02/2014 | US20140003631 Amplification systems and methods with noise reductions |
| 12/26/2013 | US20130343577 Audio Visual Enhancement Apparatus |
| 12/17/2013 | US8611561 First stage audio amplifier with clamping circuit |
| 12/17/2013 | US8610498 Methods and apparatus for variable solid state-to-tube rectification in an amplifier |
| 12/12/2013 | US20130329914 Method and system of audio capture based on logarithmic conversion |
| 12/12/2013 | US20130329904 Device, headphones and audio player with environmental sound mixing function |
| 12/05/2013 | US20130322656 Loudspeaker system |
| 12/03/2013 | US8600081 Audio signal amplifying circuit |
| 11/12/2013 | US8582787 Preamplifier circuit for a microelectromechanical capacitive acoustic transducer |
| 10/31/2013 | US20130287228 Intelligently increasing the sound level of player |
| 10/17/2013 | US20130272545 Multi-stage amplifier with pulse width modulation (pwm) noise shaping |
| 10/10/2013 | US20130266156 Sensor amplifier arrangement and method for amplification of a sensor signal |
| 10/08/2013 | US8553909 Low-power class D amplifier using multistate analog feedback loops |
| 10/08/2013 | US8553908 Amplification apparatus |
| 10/03/2013 | US20130259267 Audio amplifier apparatus |
| 10/03/2013 | US20130259266 Electronic device and audio processing circuit |
| 09/19/2013 | US20130243223 Audio signal processing circuit, car audio apparatus using the same, audio component apparatus, electronic device and output audio signal generating method |
| 09/19/2013 | US20130241635 Capacitor Amplifying Circuit and Operating Method Thereof |
| 09/17/2013 | US8538045 Device and method for compensating supply voltage from power supply and electronic apparatus |
| 09/03/2013 | US8526640 Apparatus and method for switching audio amplification |
| 09/03/2013 | US8525710 Audio amplifier offset reduction using digital input/output comparisons |
| 08/29/2013 | US20130223652 Digital Input Class-D Audio Amplifier |
| 08/29/2013 | US20130223650 Dc-dc converter and audio output unit |
| 08/29/2013 | US20130223646 Speaker control method and speaker control system |
| 08/27/2013 | US8520864 Projector and audio output method |
| 07/18/2013 | US20130182859 Audio system with synthesized positive impedance |
| 06/27/2013 | US20130165062 Tuner input circuit |
| 06/27/2013 | US20130163787 Electronically Orbited Speaker System |
| 06/20/2013 | US20130156232 Amplifying circuit capable of suppressing spikes of an audio signal |
| 06/20/2013 | US20130156230 Waveform shaping for audio amplifiers |
| 06/19/2013 | CN101933084B Electronic bass register musical instrument tube preamplifier |
| 06/04/2013 | US8457330 Method and apparatus for boosting an audible signal in a notification system |
| 05/30/2013 | US20130136278 Guitar amplifier |
| 05/28/2013 | US8452427 Signal path using general-purpose computer for audio processing and audio-driven graphics |
| 05/21/2013 | US8447050 Thermal feedback for switch mode amplification |
| 05/16/2013 | US20130121512 Audio amplifier |
| 05/16/2013 | US20130121504 Microphone array with daisy-chain summation |
| 05/14/2013 | US8442240 Sound processing apparatus, sound processing method, and sound processing program |
| 05/02/2013 | US20130108080 Audio Output Amplifier |
| 04/18/2013 | US20130094673 Method and apparatus for outputting audio signal |
| 04/11/2013 | US20130089223 Output Power Limiter in an Audio Amplifier |
| 04/09/2013 | US8416969 Amplifier circuit |
| 04/09/2013 | US8416968 Audio device and audio input/output method |
| 04/02/2013 | US8411880 Sound quality by intelligently selecting between signals from a plurality of microphones |
| 04/02/2013 | US8411879 Speaker driver circuit driven by positive and negative voltages |
| 04/02/2013 | US8411878 Landscape speaker connector and sound system |
| 03/28/2013 | US20130076359 Output stage module for a power amplifier device |