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| Number | Title | Issue Date |
| 8116483 | Speaker device with the phase changing device for varying the phase of the audio signal A speaker device comprises a first speaker (SP1) for reproducing an audio signal and a second speaker (SP2) adapted for reproducing an audio signal and spaced from the first speaker horizontally by a predetermined distance. At least one of the first an... | 02/14/2012 |
| 8085950 | Sound signal processing apparatus and sound signal processing method A sound signal processing apparatus and a sound signal processing method divide an input signal into a low frequency signal output (11) and a high frequency signal output (10), and delay only the high frequency signal output (10), thereby reduci... | 12/27/2011 |
| 8050424 | Speaker system, audio amplifier and audio system Speaker system is constructed of a plurality of speakers each including a bass-reflex type cabinet. The speaker system is designed to differentiate a low-band resonance frequency between the speakers by differentiating inner cubic capacities of the speaker cabinets ... | 11/01/2011 |
| 7778427 | Phase compensation techniques to adjust for speaker deficiencies In an embodiment, a phase compensation system shifts the phase of an audio signal in a mid-range frequency band to compensate for phase distortion created when an electrical audio signal is converted to audio by an electronic transducer, such as a loudspeaker. An au... | 08/17/2010 |
| 7676047 | Electroacoustical transducing with low frequency augmenting devices A method for processing a multichannel audio signal. The method includes mounting electroacoustical transducers in a low frequency augmenting device. The electroacoustical transducers radiate different high frequency acoustic energy and common low frequency acoustic... | 03/09/2010 |
| 7657039 | Sound quality enhancement circuit for audio signals and audio amplifier circuit using the same The present invention comprises a circuit having at least not less than three cascade connected phase shift circuits and wherein the phase characteristic of the circuit is determined in such a manner that the phase of the audio input signals is gradually delayed dep... | 02/02/2010 |
| 7606377 | Method and system for surround sound beam-forming using vertically displaced drivers A method and system for surround sound beam-forming using vertically displaced drivers provides a low cost alternative to present external surround array systems. A pair of vertically displaced speaker drivers is supplied with surround and main channel information i... | 10/20/2009 |
| 7529376 | Directional speaker control system In a directional speaker control system for realizing good sound localization by correcting the directivity of a directional speaker, adapted to an audio surround system in which a desired sound is reflected on a wall surface or a sound reflection board so as to pro... | 05/05/2009 |
| 7477752 | Loudspeaker system A loudspeaker system with three loudspeakers (LF, LR, LB), includes a first and a second amplifier (BF, BR), each of which amplifies a channel of an audio signal. The outputs of the amplifiers (FDA, FIA; RDA, RIA) are in phase opposition, wherein the outputs of the ... | 01/13/2009 |
| 7409068 | Low-noise directional microphone system A low-noise directional microphone system includes a front microphone, a rear microphone, a low-noise phase-shifting circuit and a summation circuit. The front microphone generates a front microphone signal, and the rear microphone generates a rear microphone signal... | 08/05/2008 |
| 7382888 | Phase shifting audio signal combining Combining audio channel signals includes shifting the phase of a first audio signal relative to a second audio signal. In one embodiment, the relative phase shifting is substantially limited to a predetermined frequency range. ... | 06/03/2008 |
| 7369666 | Audio reproducing system High and low frequency components Cn1, Cn2 are generated by causing a center channel audio signal Cn to pass through a high-pass filter HPF and a low-pass filter LPF, and the high frequency component Cn1 is supplied to the center cha... | 05/06/2008 |
| 7369672 | Personal audio visual system An audio visual system has a housing with a video display and one or more speakers. The speakers are housed in cavities which limit dispersion of the sound generated, and the video display is preferably a directional LCD display. The housing is preferably mounted to... | 05/06/2008 |
| 7366312 | Artificial stereophonic circuit and artificial stereophonic device An artificial stereophonic circuit which includes a monophonic signal input terminal, a signal output terminal of one of an L channel and an R channel which are connected to the signal input terminal, a phase-shifting circuit having an input side connected to the si... | 04/29/2008 |
| 7340272 | Mobile communication terminal having a three-dimensional surround sound effect and its control method A mobile communication terminal with three-dimensional surround-sound effect system has a data processing section for coding and modulating a transmitting signal or demodulating and decoding a receiving signal, and an audio processing section for reproducing an audi... | 03/04/2008 |
| 7315625 | Sound apparatus, method of changing sound characteristics, and data recording medium on which a sound correction program This invention is a sound apparatus having a plurality of different kinds of speakers and that independently performs correction of the sound signal for each speaker to obtain optimum sound and sound field. This sound apparatus has an output device that receives aud... | 01/01/2008 |
| 7313242 | Hypersonic transducer This invention provides methods and apparatus for focusing a hypersonic beam to control both a direction and depth of audible formation delivery. Signals that are delivered to each of a plurality of hypersonic transducer elements are adjusted in phase so that transm... | 12/25/2007 |
| 7299893 | Loudspeaker horn and method for controlling grating lobes in a line array of acoustic sources A loudspeaker horn (11) having a throat end (13) for receiving acoustic power from aligned acoustic power sources (41, 43, 45), an elongated throat (33), and a flared section (17) is provided with grating lobe mitigation fins (2... | 11/27/2007 |
| 7298854 | Apparatus, methods and articles of manufacture for noise reduction in electromagnetic signal processing Apparatus, methods and articles of manufacture are disclosed for modifying electromagnetic waves by reducing noise in those waves. A transfer function for a plurality of segments is derived through identifying a desired output parameter. That transfer function is th... | 11/20/2007 |
| 7292697 | Audio reproducing system High and low frequency components Cn1, Cn2 are generated by causing a center channel audio signal Cn to pass through a high-pass filter HPF and a low-pass filter LPF, and the high frequency component Cn1 is supplied to the center cha... | 11/06/2007 |
| 7289633 | System and method for integral transference of acoustical events A sound system for capturing and reproducing sounds produced by a plurality of sound sources. The system comprises a device for receiving sounds produced by the plurality of sound sources and converting the separately received sounds to a plurality of separate audio... | 10/30/2007 |
| 7277551 | Sound reproducing apparatus and sound reproducing method A sound reproducing apparatus includes a low-frequency sound reproducing unit for reproducing and outputting a low-frequency sound having a frequency of a predetermined frequency or less; a high-frequency sound reproducing unit for reproducing and outputting a high-... | 10/02/2007 |
| 7274793 | Excursion limiter An excursion limiter (10) broadly comprises a voltage controlled filter (40) to suppress an audio signal according to a selected threshold at a selected frequency using a control voltage. The voltage controlled filter (40) preferably produces an... | 09/25/2007 |
| 7254239 | Sound system and method of sound reproduction A sound reproduction system comprises a left and right speakers located in close proximity, and a sound processor which provides audio signals to the pair of speakers. The sound processor preferably derives a cancellation signal from the difference between the left ... | 08/07/2007 |
| 7251333 | Method and apparatus for creating a virtual third channel in a two-channel amplifier A method and apparatus for creating a third signal channel from an input signal received in each of a first and second channel involves inverting a predetermined frequency range of signals in the first channel out of phase with a corresponding frequency range of sig... | 07/31/2007 |
| 7242782 | Audio signal processing circuit An audio signal processing circuit for an audio reproduction apparatus at least having sound source located substantially at left and right sides to a listener, is provided. The audio signal processing circuit includes a phase difference control portion. The phase d... | 07/10/2007 |
| 7224808 | Dynamic carrier system for parametric arrays A system configured to dynamically adjust the ultrasonic carrier level in a parametric array system in response to changing source signal input levels, and which employs a look-ahead delay strategy to enable optimal modulation of the carrier wave to eliminate consta... | 05/29/2007 |
| 7215788 | Digital loudspeaker 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 inputs; a first n bit digital up/do... | 05/08/2007 |
| 7181025 | Ultrasound based parametric loudspeaker system A parametric loudspeaker system is described which is based upon the FM-modulation of an ultrasound carrier. Known systems work with AM-modulation. The FM-modulation produces a good matching to the resonant transducer such as the conventionally employed piezo-cerami... | 02/20/2007 |
| 7181034 | Inter-channel communication in a multi-channel digital hearing instrument A multi-channel digital hearing instrument is provided that includes a microphone, an analog-to-digital (A/D) converter, a sound processor, a digital-to-analog (D/A) converter and a speaker. The microphone receives an acoustical signal and generates an analog audio ... | 02/20/2007 |
| 7177431 | Dynamic decorrelator for audio signals A system and method are described for rendering a left rear surround input signal at a left rear virtual speaker location and rendering a right rear surround input signal at a right rear virtual speaker location. The method includes phase shifting the left rear surr... | 02/13/2007 |
| 7173481 | CMOS reference voltage circuit A CMOS reference voltage circuit, preferably formed on a semiconductor integrated circuit, and outputting a reference voltage having a temperature-independent characteristic, comprises first and second diode-connected transistors (or diodes), respectively grounded a... | 02/06/2007 |
| 7171005 | P.A. system installation method The invention concerns a method for transmitting in an area (100) information items in the form of sound waves representing a signal X(t), through a loudspeaker enclosure (2), said method comprising a step of setting up a public address system which co... | 01/30/2007 |
| 7139402 | Sound reproduction device A sound reproduction device of the present invention includes: a first loudspeaker; a second loudspeaker; a first loudspeaker drive section for driving the first and second loudspeakers, the first loudspeaker drive section drives the first and second loudspeakers at... | 11/21/2006 |
| 7138576 | Sound system and method for creating a sound event based on a modeled sound field A sound system and method for modeling a sound field generated by a sound source and creating a sound event based on the modeled sound field is disclosed. The system and method captures a sound field over an enclosing surface, models the sound field and enables repr... | 11/21/2006 |
| 7130430 | Phased array sound system An array of speakers are fed from a single source of audio frequency sound but each speaker transmits the sound delayed by an amount which is determined by the distance between a particular speaker and a selected region in space, so that sound from each speaker cons... | 10/31/2006 |
| 7123724 | Sound system The invention is directed to a sound system with four loudspeakers and at least one signal processing device connected to the input of two loudspeakers and controlled by two input signals. The signal processing device produces control signals for the loudspeakers. T... | 10/17/2006 |
| 7113604 | Apparatus and method for matching the response of microphones in magnitude and phase An apparatus is provided for matching the response of a pair of microphones. The two microphones provide a first and second output, respectively, in response to an audible input. The microphone outputs are subtract from each other to produce a gain control output fo... | 09/26/2006 |
| 7088833 | Multiple-speaker The invention relates to a loudspeaker combination comprised of at least two loudspeakers, of which one is preceded by a low-pass frequency filter, the other by a phase shifter in the form of an all-pass filter. The invention addresses the problem of providing with ... | 08/08/2006 |
| 7061312 | Systems and methods for providing multi channel pulse width modulated audio with staggered outputs Systems and methods for reducing the noise level in a multi-channel digital audio system by staggering the timing of the pulse-width modulation in the different channels and thereby reducing the magnitude and increasing the frequency characteristics of the generated... | 06/13/2006 |
