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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:

Class Number Class Name Patents
381/121 Feedback 111


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11

Patent Number Title Of Patent Date Issued
8712066 Audio signal clip detection Apr. 29, 2014
8705767 Electrostatic speaker system Apr. 22, 2014
8705771 Line-in signal dynamic range enhancement for output of charge pump based audio amplifier Apr. 22, 2014
8705772 Method for adjusting the maximum output power of a valve power amplifier stage for an audio amplifier, and corresponding valve power amplifier stage Apr. 22, 2014
8705773 Audio amplifier Apr. 22, 2014
8693676 Power efficiency of a line driver Apr. 8, 2014
8693708 System for operating a device for producing an audible alarm Apr. 8, 2014
8687826 Amplifier circuit Apr. 1, 2014
8675894 Audio console system Mar. 18, 2014
8660276 Driving circuit for a sound outputting apparatus Feb. 25, 2014
8660277 Amplifier circuit and methods of operation thereof Feb. 25, 2014
8654991 Audio signal amplifier circuit Feb. 18, 2014
8649532 Electronic volume circuit Feb. 11, 2014
8625820 Amplifier circuit audio circuit and electronic device Jan. 7, 2014
8625821 Method and apparatus for outputting audio signal Jan. 7, 2014
8620007 Headset capable of being used as external speaker and method of adjusting an output thereof Dec. 31, 2013
8610498 Methods and apparatus for variable solid state-to-tube rectification in an amplifier Dec. 17, 2013
8611561 First stage audio amplifier with clamping circuit Dec. 17, 2013
8600081 Audio signal amplifying circuit Dec. 3, 2013
8588433 Electret microphone circuit Nov. 19, 2013
8588428 Dynamic power sharing in a multi-channel sound system Nov. 19, 2013
8582786 Automatic gain control of amplifier by dynamic suppressing and output control at multiple stages Nov. 12, 2013
8582787 Preamplifier circuit for a microelectromechanical capacitive acoustic transducer Nov. 12, 2013
8577061 Power supply for limited power sources and audio amplifier using power supply Nov. 5, 2013
8571237 Multi-zone audio amplification system for multimedia Oct. 29, 2013
8562432 Mobile terminal and method for controlling motions using sound noise level Oct. 22, 2013
8565450 Musical instrument effects processor Oct. 22, 2013
8559644 Apparatus for sound having multiples stereo imaging Oct. 15, 2013
8559658 Electronic apparatus Oct. 15, 2013
8553908 Amplification apparatus Oct. 8, 2013
8553909 Low-power class D amplifier using multistate analog feedback loops Oct. 8, 2013
8554347 Remote audio amplifier monitoring system Oct. 8, 2013
8542848 Musical instrument preamplifier Sep. 24, 2013
8538040 Drivers and methods for driving a load Sep. 17, 2013
8532315 High powered high speed switch Sep. 10, 2013
8526638 Gain control circuit and electronic volume circuit Sep. 3, 2013
8526640 Apparatus and method for switching audio amplification Sep. 3, 2013
8516681 Loud speaker manufacturing method Aug. 27, 2013
8520863 Image display device, projector, control method, and information storage medium Aug. 27, 2013
8520864 Projector and audio output method Aug. 27, 2013
8515093 Input signal mismatch compensation system Aug. 20, 2013
8502717 Analog-to-digital converter, sound processing device, and method for analog-to-digital conversion Aug. 6, 2013
8502718 Analog-to-digital converter and analog-to-digital conversion method Aug. 6, 2013
8494185 Electro-acoustic transducer tuning and data storage Jul. 23, 2013
8494184 Digital data transfer via audio signal conductors Jul. 23, 2013
8494171 Energy saving PWM sound device Jul. 23, 2013
8483853 Controlling and manipulating groupings in a multi-zone media system Jul. 9, 2013
8476978 Headphone driver/charge pump combination Jul. 2, 2013
8472643 Power amplifier and method for restraining power of improved power amplifier Jun. 25, 2013
8472644 High efficiency audio amplifier and method thereof Jun. 25, 2013

1 2 3 4 5 6 7 8 9 10 11










 
 
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