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| Number | Title | Issue Date |
| 8175294 | Electrostatic loudspeaker with single ended drive An electrostatic loudspeaker includes a front stator, first and second substantially conductive diaphragms, a center stator and a back stator. The front stator is connected to a safe reference potential such as earth ground. The first diaphragm, the center stator an... | 05/08/2012 |
| 8081779 | Audio circuit An object is to provide an audio circuit in which flow of excessive current through a capacitive speaker and a drive circuit thereof can be prevented while degradation of sound quality of high-pitched tones is suppressed. The audio circuit for driving a capacitive s... | 12/20/2011 |
| 8064620 | Driver circuit and driving method for electrostatic loudspeaker The present invention discloses a driver circuit for an electrostatic loudspeaker, comprising: a digital modulation encoder for receiving a digital audio signal and a fixed frequency pulse signal, and mixing them by modulation; a digital to analog converter for conv... | 11/22/2011 |
| 7945059 | Speaker device, sound reproducing method, and speaker control device A speaker device mixes an audible frequency band signal wave with a modulated wave obtained by modulating an ultrasonic frequency band carrier wave with an audible frequency band signal so as to generate a synthesis wave, and drives an ultrasonic transducer with the... | 05/17/2011 |
| 7899197 | Electrostatic transducer, driving circuit of capacitive load, method for setting circuit constant, ultrasonic speaker, display device and directional acoustic system Provided is an electrostatic transducer which is driven by a boosted driving signal by boosting a modulated signal obtained by modulating a carrier wave with an acoustic signal in an audio frequency band, the transducer including: an output transformer T which conne... | 03/01/2011 |
| 7443990 | Voltage biased capacitor circuit for a loudspeaker A voltage biased capacitor circuit (10) for a loudspeaker (14′) includes at least two audio circuit capacitors (32A, 32B) wired in series either on one of an audio connector or between audio connectors (16A′, 16B′). A ... | 10/28/2008 |
| 7321661 | Current feedback system for improving crossover frequency response A loudspeaker is provided for receiving an incoming electrical signal and transmitting an acoustical signal. The loudspeaker may include a power amplifier that has an input and an output, where the input receives the incoming electrical signal. The loudspeaker may a... | 01/22/2008 |
| 7308750 | Method of manufacturing a magnesium diaphragm In a rolling process, the level of rolling performed by a rolling mill for one operation is set to 1 μm to 20 μm. A magnesium substrate is rolled by rollers while being heated by a thermostatic chamber. As a result, there is manufactured a high-quality magnesium s... | 12/18/2007 |
| 7305750 | Method of assembling a loudspeaker A loudspeaker and method of assembly according to this invention provides for precise alignment between the frame and motor structure before they are connected to one another, and employs a fixture to form the moving assembly of the speaker, i.e. the voice coil, upp... | 12/11/2007 |
| 7278200 | Method of tensioning a diaphragm for an electro-dynamic loudspeaker Electro-dynamic loudspeakers typically include a diaphragm having a conductor applied to one of its surfaces. The diaphragm is secured to a frame. The conductor is connected to a power supply for providing electrical current through linear traces of the conductor th... | 10/09/2007 |
| 7216417 | Method for manufacturing an electromechanical sensor element Method for manufacturing an electromechanical sensor element for converting mechanical forces produced by the movements and vital functions or a person into electric signals, in which method a sensor film (11) is provided with metallic electrodes (15,16 | 05/15/2007 |
| 7210213 | Method for manufacturing a dynamic speaker A speaker collective substrate with component insertion hole sections and electrode sections has a plurality of speaker forming areas. An electrical speaker section, which comprises a magnetic circuit section and a vibration section, is inserted into each of the com... | 05/01/2007 |
| 7180225 | Piezoelectric vibrator A piezoelectric vibrator having excellent shock resistance and high reliability is offered. The centers of first and second piezoelectric vibrating plates are supported by pillars on a main surface of an enclosure and nearly or substantially parallel to the main sur... | 02/20/2007 |
| 7158646 | Signal derived bias supply for electrostatic loudspeakers An electrostatic loudspeaker requires a high voltage DC bias power supply to bias the stators and diaphragms of electrostatic speakers. A self biased power supply eliminates the need for an external power supply by deriving a high voltage bias from the stator AC sig... | 01/02/2007 |
| 7152299 | Method of assembling a loudspeaker Electro-dynamic loudspeakers typically include a diaphragm having a conductor applied to one of its surfaces. The diaphragm is secured to a frame. The conductor is connected to a power supply for providing electrical current through linear traces of the conductor th... | 12/26/2006 |
| 7146011 | Steering of directional sound beams Apparatus is disclosed for steering a directional audio beam that is self-demodulated from an ultrasound carrier. The apparatus includes means for modulating a carrier signal with an audio signal and means for adjusting the amplitude and phase of at least one of the... | 12/05/2006 |
| 7106880 | Universal ribbon element-module for two or more membrane-widths with optimized flow and drive A loudspeaker module in the form of a ribbon element, where the module can be equipped with a membrane, 50 millimeters in width or narrower, and with any length from 50 millimeters to 2500 millimeters. The magnet system is equipped with so called booster-magnets in ... | 09/12/2006 |
| 7062055 | Elastomeric dielectric polymer film sonic actuator A sonic actuator including a multi-layer membrane having a non-metallic elastomeric dielectric polymer layer with a first surface and a second surface, a first compliant electrode layer contacting the first surface of the polymer layer, and a second compliant electr... | 06/13/2006 |
| 7058463 | Method and apparatus for implementing a class D driver and speaker system An audio path is constructed to include a multi-bit sigma-delta converter for converting an N-bit digital input to an n-bit output representing an over-sampled, lower resolution n-bit version of the N-bit digital input; a formatter for converting the n-bit output to... | 06/06/2006 |
| 7054456 | Invertedly driven electrostatic speaker An electrostatic speaker system is provided wherein a multitude of speakers are provided in the system, each speaker having a thin electrically conductive film membrane sandwiched between a pair of stator plates. The film membrane is directly coupled to a high volta... | 05/30/2006 |
| 6996891 | Method for the manufacture of a sensor element The invention relates to a method for the manufacture of a sensor element and to a sensor element. In the method, both surfaces of a sensor film are provided with metallic electrodes. The sensor element is produced by cutting it from a larger amount of sensor elemen... | 02/14/2006 |
| 6967541 | Digital pulse-width-modulation generator A digital pulse-width-modulation (PWM) generator comprising: an n bit digital magnitude comparator having first and second n bit inputs and an output indicative of the relative values of the signals applied at the first and second ... | 11/22/2005 |
| 6935335 | System and method for treating obstructive sleep apnea There is disclosed a system and method for treating obstructive sleep apnea by terminating an obstructive sleep apnea event before the cessation of breathing occurs. The system comprises one or more microphones capable of detecting breathing sounds within an airway ... | 08/30/2005 |
| 6925187 | Horn array emitter A sonic emitter, horn array with enhanced emitter-to-air acoustic coupling, with particular application to ultrasonic frequencies. The emitter comprises a plate support member having opposing first and second faces separated by an intermediate plate body. The plate ... | 08/02/2005 |
| 6915555 | Method for manufacturing speaker A method of manufacturing a loudspeaker comprises: continuously forming diaphragm portions and alignment portions on a band resin film; positioning one of a frame and a protector at an upper die or lower die; aligning other alignment portions formed on the frame, th... | 07/12/2005 |
| 6914991 | Parametric audio amplifier system A smaller, less expensive, parametric audio amplifier system configured to be conformable to cable routing requirements that are no more stringent than that of conventional loudspeaker systems. The parametric audio amplifier system includes an amplifier assembly for... | 07/05/2005 |
| 6842964 | Process of manufacturing of electrostatic speakers An electrostatic speaker is constructed using a thin flexible membrane as the active member. This membrane is uniformly positioned against at least one printed circuit board containing at least one stator fixed in the PCB. Variations in structure are provided, all i... | 01/18/2005 |
| 6817084 | Method for manufacturing a speaker apparatus A method for manufacturing a speaker apparatus that includes fixing a magnetic circuit to a frame so that the magnetic circuit is positioned around a central hole of the frame; positioning a coil with respect to a center pole of the magnetic circuit; connecting a da... | 11/16/2004 |
| 6771785 | Ultrasonic transducer for parametric array An ultrasonic transducer having a reduced cost of manufacture. The ultrasonic transducer includes a first insulative retaining layer, a second insulative retaining layer, and a vibrator film layer sandwiched between the first and second retaining layers. The first r... | 08/03/2004 |
| 6725109 | Sound generator circuit system and method A sound generator circuit configured for a handheld computer is disclosed. A method of producing a tone with a sound generator and handheld computer is also disclosed. The sound generator circuit includes a low pass filter having an input and an output. The input is... | 04/20/2004 |
| 6718040 | Transformer, loudspeaker device, loudspeaker network, and loudspeaker system A transformer includes a bobbin having a cavity, a primary winding wound around the bobbin, and a secondary winding wound around the bobbin and magnetically coupled with the primary winding. In the transformer, at least one of the primary winding and the secondary w... | 04/06/2004 |
| 6678383 | Capacitor microphone A capacitor microphone includes a case having an end wall defining an opening for a sound hole, a capacitor portion comprising a diaphragm, a back plate and a spacer, the diaphragm opposing to the back plate via the spacer, the capacitor portion being acc... | 01/13/2004 |
| 6639988 | Piezo integrated flat speakers for automotive interior panels A member for producing an audible sound in a vehicle including a speaker area having an upper surface and a lower surface, the speaker area being located on the member. A piezo bimorph is attached to the speaker area, the piezo bimorph including a first p... | 10/28/2003 |
| 6483924 | Acoustic elements and method for sound processing The invention relates to an acoustic element and method for sound processing. The acoustic element (1) is made of a porous stator plate (2) which is either electrically conductive or plated on at least one of its surfaces to be conductive. A moving diaphr... | 11/19/2002 |
| 6459799 | Modularly expandable electrostatic speaker system An non-hybrid electrostatic speaker system is provided. Each electrostatic speaker contains a diaphragm positioned between pair of electrically charged stators. A central unit is provided having a plurality of slots for receiving a plurality of printed ci... | 10/01/2002 |
| 6396933 | High-fidelity and high-efficiency analog amplifier combined with digital amplifier This invention provides an analog audio amplifier having both excellent linearity and high efficiency, which is combined with digital amplifier. The analog-digital combined amplifier comprises a class A, class B or class AB type analog amplifier serving a... | 05/28/2002 |
| 6343129 | Elastomeric dielectric polymer film sonic actuator A sonic actuator including a multi-layer membrane having an elastomeric dielectric polymer layer with a first surface and a second surface, a first compliant electrode layer contacting the first surface of the polymer layer, and a second compliant electro... | 01/29/2002 |
| 6188772 | Electrostatic speaker with foam stator An electrostatic speaker device, comprising a first foam stator having an interior surface, and a second foam stator having an interior surface positioned adjacent to the interior surface of the first stator. The interior surfaces of the first and second ... | 02/13/2001 |
| 6044160 | Resonant tuned, ultrasonic electrostatic emitter An ultrasonic emitter device for converting electrical signals to audio output by acoustic heterodyning of ultrasonic emissions. The device comprises a rigid core member having a top surface which includes an array of cavities of predetermined size and me... | 03/28/2000 |
| 5894452 | Microfabricated ultrasonic immersion transducer An ultrasonic capacitance transducer having a sealed membrane supported above a conductive substrate by thin insulating material to form a sealed evacuated cavity whereby the transducer can operate immersed in fluid.... | 04/13/1999 |
