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| Number | Title | Issue Date |
| 8150068 | Array speaker system Signals on respective RL, FL, C, FR, RR channels are divided into high frequency signals and low frequency signals by HPFs and LPFs respectively. The low frequency signals on the RL, FL, and C channels are superposed and output from a left-side woofer 21-1... | 04/03/2012 |
| 8121312 | Wide-band equalization system A Wide-band Equalization System (“WBES”) based on near- and far-field measurement data. The WBES includes a subwoofer equalizer having an FIR filter together with decimator and interpolator filters for processing low frequency signals. The WBES may also include ... | 02/21/2012 |
| 8081775 | Loudspeaker apparatus for radiating acoustic waves in a hemisphere around the centre axis Loudspeaker apparatus comprise commonly some sort of casings or assemblies, in which one or more single speakers are integrated and which are used to convert electrical signals into sound. A loudspeaker apparatus 1 for radiating sound in a hemisphere is discl... | 12/20/2011 |
| 8077881 | Sound device A sound device is provided with an input terminal for electronic signal input; a low pass filter adapted to filter electronic signals input to the input terminal and to output low frequency range electronic signals, a switch arrangement adapted to switch between ful... | 12/13/2011 |
| 8031883 | Crosstalk cancellation system with sound quality preservation and parameter determining method thereof A crosstalk cancellation system for preserving quality of sound and the parameter determining method thereof. The system can cancel a two-channel audio signal without compensating a frequency response of an ipsilateral HRTF. The method includes providing an audio si... | 10/04/2011 |
| 8019093 | Stream segregation for stereo signals Separating a source in a stereo signal having a left channel and a right channel includes transforming the signal into a short-time transform domain; classifying portions of the signals having similar panning coefficients; segregating a selected one of the classifie... | 09/13/2011 |
| 8005240 | Speaker with frequency directed dual drivers A speaker that includes a pair of spaced-apart, in-plane mounted drivers connected in series to a network for applying the appropriate frequency component of the electrical input drive signal to each of the drivers is disclosed. A frequency dependent shunting networ... | 08/23/2011 |
| 7991170 | Loudspeaker crossover filter A method is provided for computing frequency responses of crossover filters for multi-way loudspeakers. The method prescribes driver coordinates for drivers in the multi-way loudspeaker, prescribes an attenuation function for the sound pressure level at a desired an... | 08/02/2011 |
| RE42390 | Sound signal playback machine and method thereof In a sound signal playback machine and method thereof, predetermined high frequency components are extracted from sound signals SL to SC of a main channel by high frequency pass filters 21 to 25, and these high frequency component... | 05/24/2011 |
| 7826626 | Cross-over frequency selection and optimization of response around cross-over A system and method provide at least a single stage optimization process which maximizes the flatness of the net subwoofer and satellite speaker response in and around a cross-over region. A first stage determines an optimal cross-over frequency by minimizing an obj... | 11/02/2010 |
| 7613311 | Digital implementation of a fourth order Linkwitz-Riley network with a low cutoff frequency A simplified digital implementation of a fourth order Linkwitz-Riley crossover network is provided using approximations and transformations of the classical form. The approximation is particularly beneficial when the crossover frequency is low relative to the digita... | 11/03/2009 |
| 7577263 | System for audio signal processing A sound reproduction system comprising a digital audio signal input (1), a digital audio signal processor (2, DSP) and a digital audio signal output (3) wherein the digital signal processor (2, DSP) comprises a high pass (HP) filter (2... | 08/18/2009 |
| 7418104 | Speaker system A speaker system having a first speaker, a second speaker, and a housing having a first mounting surface to which the first speaker is mounted and a second mounting surface to which the second speaker is mounted. The first mounting surface and the second mounting su... | 08/26/2008 |
| 7409066 | Method of adjusting filter parameters and an associated playback system To improve upon a method of adjusting at least one filter parameter such as the mid-frequency of at least one filter unit provided with a playback system for audio signals, this filter unit being provided in particular for at least one digital equalizer assigned to ... | 08/05/2008 |
| 7409067 | Method and apparatus for adjusting frequency characteristic of signal In a frequency characteristic adjustment apparatus incorporated in an audio system, a frequency characteristic of an audio signal is made to agree with a target frequency characteristic, thus providing an equalizing function. In the apparatus, by a frequency charact... | 08/05/2008 |
| 7397924 | Modular loudspeaker The present invention relates to a modular loudspeaker, primarily intended to be used as a studio monitor and comprising a broadband module for radiating a first frequency range with a lower limiting frequency sufficiently low to provide a fully acceptable reproduct... | 07/08/2008 |
| 7392880 | Dual range horn with acoustic crossover A new approach has been developed to combine mid-range and high frequency sound into the throat of a horn designed for sound reinforcement. An acoustic low pass filter element is interposed between the lower frequency passage and the higher frequency passage, so tha... | 07/01/2008 |
| 7343018 | System of sound transducers with controllable directional properties The invention relates to loudspeaker systems or loudspeaker columns as used in public address systems and at (pop) concerts. Such systems heretofore possess a frequency-dependent coverage angle and strong second and third order side lobes. The invention describes fo... | 03/11/2008 |
| 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 |
| 7315624 | Stream segregation for stereo signals Separating a source in a stereo signal having a left channel and a right channel includes transforming the signal into a short-time transform domain; classifying portions of the signals having similar panning coefficients; segregating a selected one of the classifie... | 01/01/2008 |
| 7302067 | Audio system for a computer A computer audio system includes an audio codec and a tone controller. The audio codec is operably coupled to receive audio information, which includes tone control settings, PCM digital audio inputs and PCM digital audio outputs. In addition, the audio codec may re... | 11/27/2007 |
| 7289641 | Multiple channel earphone A multiple channel earphone is provided with an external tube disposed on the earphone main body. The earphone includes a case, a case extension unit, and a cover. A main sound field is formed in an interior chamber enclosed by the case, the case extension unit and ... | 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 |
| 7260235 | Line electroacoustical transducing A line array loudspeaker system including a large number of small, regularly and closely spaced acoustical drivers. Each of the acoustical drivers receives essentially the same audio signal. In another embodiment, a line array includes a plurality of portable line a... | 08/21/2007 |
| 7260228 | Optimum driver spacing for a line array with a minimum number of radiating elements The loudspeaker has a first pair of drivers arranged in a line, a center point along the line, wherein the pair of drivers are substantially centered about the center point with a center to center distance, d0, between the drivers in the first pair of dri... | 08/21/2007 |
| 7257231 | Stream segregation for stereo signals Separating a source in a stereo signal having a left channel and a right channel includes transforming the signal into a short-time transform domain; computing a short-time similarity measure between the left channel and the right channel; classifying portions of th... | 08/14/2007 |
| 7242783 | Audio limiting circuit An audio limiting circuit capable of satisfying frequency dependent limits and time domain constraints, is disclosed. In one illustrative embodiment, an input node receives an unattenuated input signal and a system modeling filter predicts the amount, if any, by whi... | 07/10/2007 |
| 7203329 | Audio speaker system employing an axi-symmetrical horn with wide dispersion angle characteristics over an extended frequency range A speaker system includes a speaker driver loaded by a horn waveguide. The speaker driver reproduces sound within an extended frequency range that includes a high frequency band between 8 kHz and 11 kHz. In the preferred embodiment, the extended frequency range incl... | 04/10/2007 |
| 7194287 | Electric-mechanical-acoustic-transducer and portable communication device including the same An electric-mechanical-acoustic-transducer includes a diaphragm; a movable section; a driving section for generating a driving force for vibrating the diaphragm and the movable section; and a suppression section for suppressing a sharpness (Q factor) of a vibration ... | 03/20/2007 |
| 7167573 | Full range loudspeaker An edge-driven diaphragm loudspeaker driver is configured such that the suspension system of the driver is connected to the voice coil rather than to the diaphragm. Thus, the diaphragm in the loudspeaker is free of suspension systems connected to or extending from t... | 01/23/2007 |
| 7164770 | Surround sound speaker system The present invention uses multivoice coil drivers in conjunction with the small satellite speakers of multichannel surround sound systems to achieve an overall linear response between 100 Hz to above 15 KHz. The multivoice coil drivers are designed to respond only ... | 01/16/2007 |
| 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 |
| 7135917 | Left-handed nonlinear transmission line media A left-handed nonlinear transmission line system has multiple nonlinear capacitors connected in series between input and output terminals and multiple inductances connected in parallel between the nonlinear capacitors and a return conductor extending between the inp... | 11/14/2006 |
| 7116790 | Loudspeaker Conventional analog loudspeakers have a limited dynamic range as compared to the available dynamic range of digital recordings. Digital recordings use up to 24 bits and this implies a dynamic range of 141 dB. Digital loudspeakers, involving 2N single bit ... | 10/03/2006 |
| 7106881 | Speaker A speaker 300 is formed using a plate such as a mobile phone display window 310 as a vibrating element. At least two dynamic actuators 950 are positioned behind the edges of the window 310 to actuate the window 310 through its boun... | 09/12/2006 |
| 7096995 | Polyurethane foam cabinets The invention provides a loudspeaker system having a housing made of a plastic casing and a foam positioned against the interior walls of the casing through a reaction between the foam and the interior wall. The foam increases the stiffness of the walls as well as p... | 08/29/2006 |
| 7092530 | Motor vehicle audio system A motor vehicle audio system having an audio signal receiver, an amplifier connected thereto via a fiber optic cable and a loudspeaker. A separate amplifier is provided for low audio signals. The amplifier is provided with a substantially higher line voltage when co... | 08/15/2006 |
| 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 |
| 7085389 | Infinite slope loudspeaker crossover filter An improvement to inventor's prior art loudspeaker crossover filter invention is described. A substantially flat network input-impedance characteristic across the audible frequency range is provided by the addition of at least one series connected constant resistanc... | 08/01/2006 |
| 7043032 | Tone-control circuit and method for conditioning respective frequency bands of an audio signal An audio tone-control circuit includes 4th-order low-pass, 4th-order band-pass, and 4th-order high-pass filter circuits. The 4th-order low-pass filter circuit has a first phase response and receives and filters an audio si... | 05/09/2006 |
