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Class Information
Number: 381/111
Name: Electrical audio signal processing systems and devices > Circuitry combined with specific type microphone or loudspeaker
Description: Subject matter combined with a specific audio-to-electrical signal or electrical-to-audio transducer.










Sub-classes under this class:

Class Number Class Name Patents
381/112 With carbon microphone 26
381/116 With electrostatic loudspeaker 98
381/113 With electrostatic microphone 210
381/117 With magnetic loudspeaker 79
381/115 With magnetic microphone 16
381/114 With piezoelectric microphone 60


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

Patent Number Title Of Patent Date Issued
8705767 Electrostatic speaker system Apr. 22, 2014
8705754 Measuring transducer displacement Apr. 22, 2014
8693707 Signal processing circuit Apr. 8, 2014
8693708 System for operating a device for producing an audible alarm Apr. 8, 2014
8682007 Condenser microphone unit Mar. 25, 2014
8675895 Microphone assembly with integrated self-test circuitry Mar. 18, 2014
8666106 Sound reproducing device Mar. 4, 2014
8666095 Fast precision charge pump Mar. 4, 2014
8666094 Drive control method of electrostatic-type ultrasonic transducer, electrostatic-type ultrasonic transducer, ultrasonic speaker using electrostatic-type ultrasonic transducer, audio signal repr Mar. 4, 2014
8666090 Microphone modeling system and method Mar. 4, 2014
8660276 Driving circuit for a sound outputting apparatus Feb. 25, 2014
8660286 Speaker system Feb. 25, 2014
8649534 Audio interface device and method Feb. 11, 2014
8644529 Fully differential low-noise capacitor microphone circuit Feb. 4, 2014
8630429 Preventing electrostatic pull-in in capacitive devices Jan. 14, 2014
8615092 Sound processing device, correcting device, correcting method and recording medium Dec. 24, 2013
8611561 First stage audio amplifier with clamping circuit Dec. 17, 2013
8611566 MEMS-microphone Dec. 17, 2013
8606571 Spatial selectivity noise reduction tradeoff for multi-microphone systems Dec. 10, 2013
8600079 Amplifier circuit of capacitor microphone Dec. 3, 2013
8600080 Methods for communicating with electronic device accessories Dec. 3, 2013
8594743 Portable terminal, audio output control method, and audio output control program Nov. 26, 2013
8588433 Electret microphone circuit Nov. 19, 2013
8582783 Surround sound generation from a microphone array Nov. 12, 2013
8577054 Signal processing apparatus, signal processing method, and program Nov. 5, 2013
8559643 Stereo microphone unit and stereo microphone Oct. 15, 2013
8559650 Circuit apparatus and method for detecting earphone in portable terminal Oct. 15, 2013
8559657 Capacitor microphone Oct. 15, 2013
8553894 Active and passive directional acoustic radiating Oct. 8, 2013
8542847 Controlled overlap driver circuit Sep. 24, 2013
8526625 Stereo microphone Sep. 3, 2013
8515093 Input signal mismatch compensation system Aug. 20, 2013
8515099 Capacitor microphone Aug. 20, 2013
8515100 Programmable microphone Aug. 20, 2013
8509459 Noise cancelling microphone with reduced acoustic leakage Aug. 13, 2013
8498427 Remote control earphone and electronic device using the same Jul. 30, 2013
8494173 Integrated circuit with configurable output cell Jul. 23, 2013
8493140 Output coupling capacitor free audio power amplifier dynamically configured for speakers and headphones with excellent click and pop performance Jul. 23, 2013
8488812 Biasing circuit for a microelectromechanical acoustic transducer and related biasing method Jul. 16, 2013
8478356 Audio amplifier Jul. 2, 2013
8472640 Elevated toroid microphone apparatus Jun. 25, 2013
8467550 Condenser microphone Jun. 18, 2013
8467548 Miniature micro-electromechanical system (MEMS) based directional sound sensor Jun. 18, 2013
8452025 Power supply circuit including voltage regulator and headphone driving circuit employing the same May. 28, 2013
8447049 Programmable microphone May. 21, 2013
8437483 Active snubber for improving stability of headphone amplifiers May. 7, 2013
8423165 Digital/analogue conversion apparatus Apr. 16, 2013
8422694 Source sound separator with spectrum analysis through linear combination and method therefor Apr. 16, 2013
8391514 Parametric transducer systems and related methods Mar. 5, 2013
8391518 Condenser microphone Mar. 5, 2013

1 2 3 4 5 6 7 8










 
 
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