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| Number | Title | Issue Date |
| 8098849 | Low frequency equalization for loudspeaker system A method of optimizing the low frequency audio response emanating from a pair of low frequency transducers housed within a cabinet. The low frequency transducers are electrically connected to a power amplifier and source of audio content. The resonant frequency (Fs)... | 01/17/2012 |
| 7940943 | Speaker driving apparatus A speaker driving apparatus includes a speaker enclosure whose inside is tightly closed, at least two speakers that are provided to the speaker enclosure so as to have a common rear space, and a signal supplying unit that supplies a stereo left channel signal to the... | 05/10/2011 |
| 7336794 | High efficiency driver for miniature loudspeakers In a first aspect the present invention provides a compact high efficiency driver suitable for driving a loudspeaker, such as a miniature loudspeaker for mobile phones or hearing aids. The driver comprising an interface for receiving an input signal, a three-level m... | 02/26/2008 |
| 7324657 | Speaker apparatus A voice coil and a magnetic driving circuit oscillate a diaphragm and a center cap. A magnetic lighting circuit for providing a magnetic field to an induction coil is mounted separately from a magnetic driving circuit. The induction coil generates an electromotive f... | 01/29/2008 |
| 7277555 | Electroacoustic transducer with built in transducer circuit In an electroacoustic transducer (1), an annular shaped magnet system (14) is provided, enclosing an inner space (22), in which inner space (22) an integrated circuit (31) is accommodated, with the aid of which integrated circuit (... | 10/02/2007 |
| 7227966 | Piezo-electric speaker A piezo-electric speaker ensures a uniform sound in a broad band and can easily reproduce a signal of large amplitude or sound. A piezo-electric speaker has a piezo-electric member to generate a vibration according to an electric signal applied thereto. A piezo-elec... | 06/05/2007 |
| 7224817 | Loudspeaker A loudspeaker of the present invention includes a diaphragm; a voice coil for driving the diaphragm; and a magnetic circuit including a yoke, a magnet provided on the yoke, and an upper plate provided on the magnet, for producing a magnet field that is perpendicular... | 05/29/2007 |
| 7212787 | Wireless audio transmission system A wireless audio transmission and reception system includes a pulse width amplifier, an up-converter, a transmitter, a receiver, a down-converter, an integrator, and a power amplifier to transfer an analog signal to a transducer such as a speaker. The pulse width am... | 05/01/2007 |
| 7194104 | Universal audio speaker connection block A speaker interconnection block with two voice coils to be driven with separate amplifiers, or to use one amplifier to drive the two voice coils in series or parallel without having to reinterconnect the voice coils. This is achieved by locating the negative voice c... | 03/20/2007 |
| 7171011 | Acoustic drive circuit An acoustic drive circuit for driving a headphone for converting variation of magnetic force, occurring to a voice coil, in sound, and outputting the sound, includes a power amplifier for amplifying a signal at a frequency within the speech band, and outputting the ... | 01/30/2007 |
| 7146019 | Planar ribbon electro-acoustic transducer with high SPL capability and adjustable dipole/monopole low frequency radiation A planar electro-acoustic transducer has an adjustable back cap option that provides a dipole/monopole radiation that has different roll-off characteristics. The planar electro-acoustic transducer includes a diaphragm and a plurality of front and rear magnetic bars.... | 12/05/2006 |
| 7123738 | Loudspeaker The present invention is directed to a speaker using lightweight, highly rigid diaphragm having excellent frequency characteristic and improving resistance to environment (including resistance to UV and resistance to fading). For this end, the speaker utilizes a con... | 10/17/2006 |
| 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 |
| 7099488 | Planar speaker wiring layout Trace runs for Planar Line Source Transducers (or speakers) are separated into multiple trace circuits which are electrically isolated but occupy the same area on the planar film. The separate trace runs are then driven with different electrical signals with tailore... | 08/29/2006 |
| 7089069 | Method and apparatus for reconstruction of soundwaves from digital signals Each of a plurality of speaklets (MEMS membranes) produces a stream of clicks (discrete pulses of acoustic energy) that are summed to generate the desired soundwave. The speaklets are selected to be energized based on the value of a digital signal. The greater the s... | 08/08/2006 |
| 7088827 | Reconfigurable speaker system A reconfigurable speaker system for producing sound in response to at least one of right and left channel audio signals generated by an audio source. The speaker system can be configured by the user to simultaneously reproduce right and left channel audio informatio... | 08/08/2006 |
| 7054436 | Communication terminals with a dual use speaker for sensing background noise and generating sound, and related methods and computer program products Communication terminals, methods, and computer program products are provided that sense background noise via a speaker that is also used to generate sounds. In some methods of operating a communication terminal, and a speaker signal is supplied to a first speaker to... | 05/30/2006 |
| 7043028 | Method and system for using an audio transducer as both an input and output device in full duplex operation A method and system for using an audio transducer as both an input device and an output device is disclosed. The method and system include digitally modulating a primary input signal for driving the transducer as an output device, sampling an output signal generated... | 05/09/2006 |
| 7019955 | MEMS digital-to-acoustic transducer with error cancellation An acoustic transducer comprising a substrate; and a diaphragm formed by depositing a micromachined membrane onto the substrate. The diaphragm is formed as a single silicon chip using a CMOS MEMS (microelectromechanical systems) semiconductor fabrication process. Th... | 03/28/2006 |
| 6970044 | Audio signal amplifier circuit and electronic apparatus having the same The present invention is provided with a first, a second and a third differential amplifier which operate at a source voltage with respect to a reference voltage or a voltage between these; an output stage having a first and a second transistor driven complimentaril... | 11/29/2005 |
| 6952874 | Two-stage phasing plug system in a compression driver This invention provides a two-stage phasing plug located within a compression driver. The two-stage phasing plug housed within the compression driver may be coupled to a horn. The two-stage phasing plug includes first and second phasing plugs. The advantages of havi... | 10/11/2005 |
| 6944306 | Harmonic amplifier and corresponding electro-acoustic transducer A method of reproducing audio sound using low level electromagnetism applied to ambient air particles to create a new magnetic field. The method uses a device having at least one winding of electric wires that re wound onto a flexible polymer support. The impedance ... | 09/13/2005 |
| 6937090 | Charge injection reduction technique in single and multi-reference switching amplifiers A method of adding a minimum pulse width to the switching devices of both outputs of a switching differential pair enhances the performance of a switching amplifier. When used with similar switching devices at similar temperatures, this results in injecting a simila... | 08/30/2005 |
| 6904158 | Speaker apparatus In an electromagnetic induction type speaker apparatus, individual constants are set in such a manner that the following formula is satisfied N×(R1×R2)1/2/{2 Π×L1×(1−k2) | 06/07/2005 |
| 6891286 | Magnetostrictive actuator A magnetostrictive actuator comprises a rod of giant magnetostrictive material, biasing permanent magnets arranged at each end thereof and coaxially therewith so as to pass a magnetic field through the rod. An energizing electromagnetic coil is connected to an energ... | 05/10/2005 |
| 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 |
| 6711269 | Multifunction acoustic device A multifunction acoustic device has a rotor rotatably supported in a frame, a stator provided in the frame. A permanent magnet is provided on the rotor, a coil is provided for forming magnetic fluxes between the rotor and the stator. Voltage detecting means is provi... | 03/23/2004 |
| 6707919 | Driver control circuit A driver control circuit (10) that enhances a steep crossover slope while permitting selective shaping or adjusting of its in-band frequency response with a minimum number of components. The driver control circuit includes a signal connector (16) for c... | 03/16/2004 |
| 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 |
| 6563929 | Woofer having ornamental flashing lights A woofer that is capable of producing a flashing light show depending upon the volume and frequency of the sounds emitted thereby. The woofer includes at least one light emitting diode and a control circuit that are conveniently mounted on a printed circu... | 05/13/2003 |
| 6476752 | Signal processing system employing two bit ternary signal A signal processing system in which a differentially quantized digital signal is used, the digital signal having two bits which represent only three values, of which one value (10 or 01) is zero and the other two (11 and 00) values represent a positive va... | 11/05/2002 |
| 6445804 | Ultra-directional speaker system and speaker system drive method An ultra-directional speaker system has a speech generation means, an ultrasonic generation means, an amplitude modulation means to which the speech generation means and ultrasonic generation means are connected, an electro-acoustic transducer means which... | 09/03/2002 |
| 6405092 | Method and apparatus for amplifying and attenuating digital audio An apparatus for controlling audio signals having pulse code modulation (PCM) data and methods of operating the same result in efficient modulation of the audio signals. The apparatus for controlling audio signals comprises a PCM data input register confi... | 06/11/2002 |
| 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 |
| 6263084 | Power amplifier and loudspeaker frame integration An integrated amplifier and speaker system includes a speaker having a motor assembly and a frame. A power stage of the amplifier is mounted in thermal communication with the motor assembly and/or the frame. Heat generated by the power stage is thereby su... | 07/17/2001 |
| 6243472 | Fully integrated amplified loudspeaker A fully integrated, low cost, amplified electro-acoustic loudspeaker is disclosed in which an amplifier circuit (30, 130, 230, 330, 930, 1030), radio-frequency receiver amplifier circuit (430, 530), optical receiver amplifier circuit (630, 730), or networ... | 06/05/2001 |
| 6208742 | Electro-acoustic dynamic transducer system for use in a loud speaker An electro-acoustic speaker having no permanent magnet. An audio input signal is applied to a pair of parallel coils, each being in series with a diode. The diodes are oppositely acting, so that the coils conduct during alternate half cycles of the input ... | 03/27/2001 |
| 6160894 | Speaker apparatus and sound reproduction system employing same A speaker apparatus capable of reproducing from low-pitched to high-pitched sounds and a voice reproduction system employing the same. The speaker apparatus includes a speaker unit in which a primary coil is mounted in a gap portion between a plate and a ... | 12/12/2000 |
| 6154557 | Acoustic transducer with selective driving force distribution An acoustic transducer with partially driven area of the diaphragm such that the driving forces are asymmetric with respect to the frame axis of symmetry or angled with respect to edges of diaphragm support frame to provide uniform frequency response of t... | 11/28/2000 |
| 6028943 | Audio amplifier system using a class D amplifier Class D amplifiers are difficult to incorporate into audio amplifier systems because of the interference created by the amplifier and/or the surrounding circuits. The modulation frequencies f1 and f2 of two class D amplifiers in an audio amplifier system ... | 02/22/2000 |
