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7612793 Spatially correlated audio in multipoint videoconferencing  
The disclosed method provides audio location perception to an endpoint in a multipoint videoconference by providing a plurality of audio streams to the endpoint, wherein each of the audio streams...
7509180 Extending digital rights management and authentication to audio speakers  
A system and method for playing audio material is described. The audio material is illustratively downloaded from a network, or from a storage media, each coupled to a loudspeaker through a speaker...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
5917922 Method of operating a single loud speaker drive system  
A method of operating a single speaker driver circuit having, a low frequency input coil connected between an audio circuit output and the input of the speaker, a low frequency return coil,...
5909496 Speaker apparatus  
A speaker apparatus which drives an electromagnetic-coupling-type speaker in accordance with a digital signal is provided with a speaker unit, and a plurality of amplifiers corresponding to the...
5615272 Single loud speaker drive system  
A single speaker driver circuit having, a low frequency input coil connected between an audio circuit output and the input of the speaker, a low frequency return coil, connected between the return...
5613010 Apparatus for reproducing sound with a reduced dynamic range  
An open-loop speaker amplifier and a dynamic range reduction circuit are disclosed. The speaker amplifier includes a bridge driver and a bridge circuit. The bridge circuit includes a first set of...
5347587 Speaker driving device  
A speaker driving device applies a constant voltage of a constant voltage source to a pair of voice coils alternatively by switching the direction of applying the constant voltage based on a binary...
5166982 Horn speaker having a cooling device  
A horn speaker in which a cooling device is attached near a moving coil which vibrates a diaphragm. The cooling device may be attached to the inner periphery of a bobbin which is connected to the...
5097513 Speaker system enclosure integrated with amplifier circuit board  
An integrated amplifier and speaker system includes a speaker having an enclosure having a closed end and an open end; an electro-acoustic driver sealingly mounted in the open end; a reflex duct...
5003609 Whole-surface driven speaker  
A whole-surface driven speaker includes first and second support plates having sound-passing perforations and groups of magnets mounted on the plates. The plates are substantially parallel to each...
4995113 Device for processing an audio-frequency electrical signal  
Device for processing an electrical signal for an electro-acoustic transducer such as a pressure chamber loudspeaker in particular. In accordance with the invention, the device essentially...
4937874 Emulated guitar loudspeaker  
Circuitry is provided for simulating and emulating the sounds of a loudspeaker driven by a classic rock and roll guitar amplifier in the form of an electrical signal which, when input to a...
4829582 Electrodynamic transducer  
An electrical transducer comprising a magnet system (1), a diaphragm (5) and a voice-coil device (3, 4), coupled to the diaphragm. The voice coil (3) is situated in an air gap (2) of the magnet...
4727583 Telephone transducer with improved frequency response  
An audio arrangement includes a thin speaker/transducer positioned within a portable housing wherein the speaker cavity is dimensioned to move the resonant frequency of the speaker/housing...
4675835 Device for compensating reproduction errors in an electroacoustic transducer  
In order to compensate reproduction errors in electroacoustic transducers (W), for example electrodynamic loud-speakers, microphones and pickup systems, computer circuits are used. In a digital...
4653103 Loudspeaker structure and system  
In a planar loudspeaker structure comprising planar membrane for forming a diaphragm on which a voice coil of a conductor pattern is formed, and a magnetic circuit for supplying a DC magnetic flux...
4612420 Loudspeaker system for converting a digitized electric signal into an acoustic signal  
An electrodynamic transducer (1) for use in a loudspeaker system for converting an n-bit digitized electric signal (11) into an acoustic signal comprises n voice-coil devices (4.1, 4.2, . . . 4.n)...
4592087 Class D hearing aid amplifier  
A subminiature power amplifier for hearing aids configured to be completely self-contained and fit within the user's ear features a Class D amplifier stage. By configuring all signal elements as...
4584438 Percussion air motor  
An electromechanical transducer converts an electrical signal into distortion free sound. Two equal coils are mounted on a sleeve within separate magnetic circuits. The coils are wound in identical...
4566120 Loudspeaker system and loudspeaker for use in a loud-speaker system for converting an n-bit digitized electric signal into an acoustic signal  
A loudspeaker system for converting an n-bit digitized electric signal (11) into an acoustic signal comprises an electrodynamic loudspeaker (1) with n voice-coil sections (4.1, 4.2, . . . 4.n)...
4564727 Subwoofer speaker system  
A method and apparatus for producing low frequency sound (20 to 100 Hz) at levels of intensity above the minimum threshold of human hearing. A mechanical-electrical drive having high power capacity...
4555797 Hybrid loudspeaker system for converting digital signals to acoustic signals  
In a loudspeaker system for converting an n-bit digitized electric signal (6) into an acoustic signal a plurality of sections (voice coils 14.1, 14.2, 14.3, 14.p) of a digital loudspeaker (1) are...
4531025 Loudspeaker with commutated coil drive  
An improvement is provided in a loudspeaker having a current carrying coil disposed in the flux gap of a permanent magnet and carrying current to drive the coil and an associated sound diaphragm....
4504704 Loudspeaker system  
A dynamic loudspeaker unit having a voice coil formed with two windings in which a capacitor is connected in series to a parallel circuit, one circuit arm being composed of a series circuit of one...
4464785 Loudspeaker system  
A loudspeaker system includes at least one electromagnetic loudspeaker assembly having a single vibratory coil form to which a vibratory diaphragm is attached. Two or more voice coils are wound on...
4461932 Ribbon type speaker and method of assembling magnetic circuit thereof  
An improved ribbon-type speaker having an independent magnetic circuit unit and vibration system assembly to thereby reduce second harmonic wave distortion and to provide a speaker which is easy to...
4426556 Electrodynamic loudspeaker  
An electrodynamic loudspeaker which comprises a generally rectangular flat vibrating plate, and first and second magnetic drives for driving the vibrating plate to produce vibrations. The first...
4387270 Method of harmonizing the impedances of an audio amplifier and loudspeaker interconnected therewith  
A method of harmonizing the impedances of an audio amplifier and a loudspeaker interconnected therewith, the audio amplifier including a line amplifier and a positive feedback circuit for...
4360707 Digitally driven combination coils for electrodynamic acoustic transducers  
An electrodynamic acoustic transducer (54) having two voice coils (50, 52), the coils being addressed by amplified digital signals. The system (12, 60, 54) utilizes a preamplified analog input...
4338489 Headphone construction  
In a diaphragm arrangement for electroacoustical transducers, in particular for headsets, one or more diaphragms lie in one plane which extends in the immediate proximity of the user's external ear...
Matches 1 - 50 out of 65 1 2 >