| Patents for H04R 19 - Electrostatic transducers (5,387) |
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| 02/09/2005 | CN1578538A Integrated base and electret capacitor microphone using the same base |
| 02/09/2005 | CN1189061C Semiconductor device, semiconductor electret capactior microphone and mfg. method thereof |
| 02/08/2005 | US6853733 Two-wire interface for digital microphones |
| 02/03/2005 | US20050025328 Integrated base and electret condenser microphone using the same |
| 02/02/2005 | EP1503611A2 Integrated base and electret condenser microphone using the same |
| 02/02/2005 | CN1575210A 超声波印刷电路板换能器 Ultrasonic transducers printed circuit board |
| 02/02/2005 | CN1575041A 驻极体电容话筒 Electret condenser microphone |
| 01/27/2005 | WO2005009077A1 Sound detection mechanism |
| 01/27/2005 | WO2005009076A1 Material for heat-resistant electret and heat-resistant electret |
| 01/27/2005 | US20050018864 Silicon condenser microphone and manufacturing method |
| 01/25/2005 | US6847090 Silicon capacitive microphone |
| 01/20/2005 | WO2004036952A3 Membrane and method for the production thereof |
| 01/20/2005 | US20050013455 MEMS digital-to-acoustic transducer with error cancellation |
| 01/19/2005 | CN1568094A Array type micro-electromechanic capacitor microphone |
| 01/18/2005 | US6845167 Contacting arrangement for an electroacoustic microphone transducer |
| 01/18/2005 | US6842964 Process of manufacturing of electrostatic speakers |
| 01/13/2005 | US20050008168 Ultrasonic transducer for parametric array |
| 01/13/2005 | US20050005421 High performance silicon condenser microphone with perforated single crystal silicon backplate |
| 01/11/2005 | US6842088 Thin film acoustic resonator and method of producing the same |
| 01/06/2005 | WO2005001287A1 Device for generating a medium stream |
| 01/06/2005 | US20050002538 Electret capacitor microphone |
| 01/06/2005 | US20050002537 Resonant panel-form loudspeaker |
| 01/06/2005 | US20050000932 Multi-metal layer MEMS structure and process for making the same |
| 01/05/2005 | EP1494503A1 Capacitor sensor |
| 01/05/2005 | EP1493303A1 Microphone assembly with auxiliary analog input |
| 01/05/2005 | CN1183803C Anti-noise pickup and its sound signal processing method |
| 01/04/2005 | US6837110 Micro-machined ultrasonic transducer (MUT) substrate that limits the lateral propagation of acoustic energy |
| 12/30/2004 | US20040263028 Electroactive polymers |
| 12/30/2004 | US20040261251 Ultrasonic printed circuit board transducer |
| 12/29/2004 | WO2004114720A1 Electromechanical transducer and a manufacturing method |
| 12/23/2004 | US20040259286 Micromechanical sensors and methods of manufacturing same |
| 12/22/2004 | CN2666075Y 驻极体传声器 Electret microphone |
| 12/22/2004 | CN1181704C Parametric loudspeaker with electro-acoustical disphragm transducer |
| 12/16/2004 | US20040252858 Method and apparatus for substantially improving power supply rejection performance in a miniature microphone assembly |
| 12/14/2004 | US6831394 Backing material for micromachined ultrasonic transducer devices |
| 12/14/2004 | US6829814 Process of making an all-silicon microphone |
| 12/09/2004 | WO2004107810A1 Sound detecting mechanism and process for manufacturing the same |
| 12/09/2004 | WO2004107809A1 Sound detection mechanism |
| 12/09/2004 | US20040249633 Acoustic vibration sensor |
| 12/09/2004 | US20040248349 Manufacturing method for a semiconductor substrate comprising at least a buried cavity and devices formed with this method |
| 12/07/2004 | US6829131 MEMS digital-to-acoustic transducer with error cancellation |
| 12/02/2004 | WO2004105428A1 Fabrication of silicon microphones |
| 12/02/2004 | WO2004057909A3 Silicon-based transducer for use in hearing instruments |
| 12/02/2004 | US20040240699 Microphone |
| 12/01/2004 | EP1481568A2 Digital microphone |
| 12/01/2004 | EP1397936B1 A method of providing a hydrophobic layer and a condenser microphone having such a layer |
| 12/01/2004 | CN1551987A Capacitance detection circuit, capacitance detection instrument and microphone device |
| 12/01/2004 | CN1551853A Micro-machined ultrasonic transducer (MUT) substrate that limits the lateral propagation of acoustic energy |
| 12/01/2004 | CN1178447C Electret microphone |
| 11/30/2004 | CA2256389C Improved microphones for an implantable hearing aid |
| 11/25/2004 | US20040232807 Electroactive polymer transducers and actuators |
| 11/16/2004 | US6819769 Electrolytic loudspeaker assembly |
| 11/16/2004 | US6818092 Multi-layer electret having ultra-high charge stability and method of manufacturing thereof |
| 11/11/2004 | WO2004098237A1 Method and apparatus for substantially improving power supply rejection performance in a miniature microphone assembly |
| 11/10/2004 | CN1545822A 麦克风 Microphone |
| 11/10/2004 | CN1175710C Semiconductor device |
| 11/04/2004 | US20040217671 Rolled electroactive polymers |
| 11/03/2004 | EP1473966A1 Electret capacitor microphone |
| 11/03/2004 | CN2653830Y Sensitivity reducing device for electret capacitor microphone |
| 11/02/2004 | US6812624 Electroactive polymers |
| 11/02/2004 | US6812620 Micromachined capacitive electrical component |
| 10/26/2004 | CA2247278C Acoustic element and method for sound processing |
| 10/21/2004 | WO2004091256A1 Field effect transistor for condenser microphone having improved resistance to electrostatic discharge |
| 10/21/2004 | WO2004079832A3 Rolled electroactive polymers |
| 10/21/2004 | US20040208329 Condenser microphone |
| 10/20/2004 | EP1469701A2 Raised microstructures |
| 10/19/2004 | US6806593 Thin film electret microphone |
| 10/14/2004 | WO2004068464A3 Acoustic vibration sensor |
| 10/14/2004 | WO2003098969A3 Micromechanical capacitive transducer and method for producing the same |
| 10/14/2004 | US20040202345 Miniature microphone with balanced termination |
| 10/13/2004 | EP1466501A1 Electromechanical transducer element, method for forming an electromechanical transducer element and transducer formed by said method |
| 10/13/2004 | EP1466500A1 Silicon microphone |
| 10/12/2004 | US6804363 Electroacoustic transducer |
| 10/12/2004 | US6804362 Electrostatic and electrolytic loudspeaker assembly |
| 10/07/2004 | US20040196990 Phantom powered capacitor microphone and a method of using a vacuum tube in the same |
| 09/30/2004 | WO2004084580A1 Condenser microphone employing wide band stop filter and having improved resistance to electrostatic discharge |
| 09/30/2004 | WO2004084579A1 Improvements in the design of electrostatic loudspeakers |
| 09/30/2004 | WO2004084578A1 Vibrator unit and portable telephone employing it |
| 09/30/2004 | DE10049355B4 Mikrofonfilter und Mikrofoneinheit Microphone and microphone filter unit |
| 09/30/2004 | CA2538668A1 Improvements in the design of electrostatic loudspeakers |
| 09/29/2004 | CN2645392Y Unidirectional condenser type microphone |
| 09/23/2004 | US20040184633 Condenser microphone assembly |
| 09/23/2004 | US20040184632 Acoustic transducer module |
| 09/22/2004 | EP1304016B1 A/d converter with integrated biasing for a microphone |
| 09/22/2004 | CN1531721A Thin film acoustic resonator and method of manufacturing resonator |
| 09/22/2004 | CN1168350C Digital electroacoustic transducer |
| 09/16/2004 | WO2004080122A1 Electret condenser microphone |
| 09/16/2004 | WO2004079832A2 Rolled electroactive polymers |
| 09/16/2004 | US20040180466 Surface micromachining process for manufacturing electro-acoustic transducers, particularly ultrasonic transducers, obtained transducers and intermediate products |
| 09/16/2004 | US20040179709 Electroacoustic miniature transducer for a hearing aid |
| 09/16/2004 | US20040179706 Microphone devices |
| 09/16/2004 | US20040179705 High performance silicon condenser microphone with perforated single crystal silicon backplate |
| 09/15/2004 | EP1221180A4 Electroactive polymers |
| 09/15/2004 | EP1212800A4 Improved electroactive polymers |
| 09/14/2004 | US6792123 Electroacoustic transducer |
| 09/14/2004 | US6791519 Sound and vision system |
| 09/08/2004 | CN1527640A Capacitor microphon |
| 09/07/2004 | US6788795 Micromachined capacitive component with high stability |
| 09/07/2004 | US6788794 Thin, lightweight acoustic actuator tile |
| 09/01/2004 | EP1093685A4 Solid-state receiver |