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| Number | Title | Issue Date |
| 8150069 | Signal processing apparatus, signal processing method, and sound field correction system A signal processing apparatus includes at least one equalization section, each of the equalization section being capable of setting a center frequency, a gain value at the center frequency, and a Q value and allowing set frequency-amplitude characteristics to be app... | 04/03/2012 |
| 8150070 | Sound signal equalizer for adjusting gain at different frequency bands A bass and treble audio tone control circuit configured as an integrated circuit, wherein a capacitor for setting a frequency band can be accommodated in an integrated circuit. A LPF extracts a low sound region component SLO from an initial sound signal S... | 04/03/2012 |
| 8135146 | Equalization method using equal loudness curve based on the IS0266:2003 standard, and sound output apparatus using the same An equalization method using equal loudness curve, and a sound output apparatus using the same are disclosed. An audio signal is equalized using a standard loudness curve so as to increase a loudness of an audio signal. A sound quality can be significantly enhanced ... | 03/13/2012 |
| 8098848 | System for equalizing an acoustic signal An equalization system enhances the quality of communications between a remote party and a local party. The equalization system includes an equalization filter that equalizes an acoustic signal received from the remote party. The equalized acoustic signal is transmi... | 01/17/2012 |
| 8085952 | Combination equalizer and calibrator circuit assembly for audio system A combination equalizer and calibrator circuit assembly includes a calibrator formed of a frequency control circuit, a signal generator, an amplifier circuit connected with a microphone, a compare circuit and a display circuit and connected to the front end of an eq... | 12/27/2011 |
| 8081776 | Indoor communication system for a vehicular cabin A system automatically determines an equalizing filter characteristic for a communication system within a vehicle. The communication system includes a loudspeaker and a microphone or microphone array. The system transmits a predetermined test signal through the loud... | 12/20/2011 |
| 8068621 | Controller of graphic equalizer An apparatus is provided for controlling a graphic equalizer which is implemented by digital filters, each being assignable to a frequency band for regulating a level of the frequency band. In the apparatus, a set of control devices are provided in correspondence to... | 11/29/2011 |
| 8031884 | Method and apparatus for reproducing music file Disclosed is a method for reproducing a music file in a terminal equipped to reproduce the music file, the method including determining equalizing reproduction characteristics of the music file when reproduction of the music file is requested, determining and settin... | 10/04/2011 |
| 8027487 | Method of setting equalizer for audio file and method of reproducing audio file A method of setting an equalizer so as to enlarge a sound field in reproducing an audio file and a method of reproducing an audio file thereby, includes: dividing an input audio file into segments with a predetermined time length; extracting an audio feature value f... | 09/27/2011 |
| 8014541 | Method and system for audio filtering A system and method for graphic equalization of audio signals is disclosed. Traditional graphic equalizers provide control over the gains in each of a set of frequency bands. However, the actual band gains vary from the desired gains due to crosstalk between bands. ... | 09/06/2011 |
| 7995774 | Sound field control apparatus and sound field control method In a sound field control apparatus including multiple speakers, multiple microphones gathering sound radiated from the multiple speakers, a mode decomposition filter that performs mode decomposition on a sound pressure distribution, and a control filter that control... | 08/09/2011 |
| 7936888 | Equalization apparatus and method based on audiogram Disclosed is an equalization apparatus and method based on audiogram. The equalization method includes the steps of a) outputting a reference sound having reference frequency and intensity for approximate assumption of auditory threshold, b) determining a start soun... | 05/03/2011 |
| 7894614 | System and method for achieving extended low-frequency response in a loudspeaker system A system and method for achieving extended low-frequency response and increased low-frequency sound pressure output capability in a loudspeaker system is provided. The system and method comprise mounting a low-frequency driver in a ported box, tuning the ported box ... | 02/22/2011 |
| 7881482 | Audio enhancement system An audio enhancement system is provided for compensating for distortions (e.g., linear distortions) of a sound signal reproduced by an audio system in a listening room. The audio enhancement system includes analysis filters that generate a plurality of analysis outp... | 02/01/2011 |
| 7764802 | Frequency-warped audio equalizer In certain embodiments, an improved audio equalization filter can be generated by frequency warping one or more digital filters having a plurality of frequency bands. Frequency warping can include, for example, transforming at least some of the frequency bands of th... | 07/27/2010 |
| 7676048 | Graphic equalizers Graphic equalizer as a cascade of equalization filters with the gain of each individual filter compensated for the gain leakage from other filters. A linear approximation allows individual filter gains to be set to give desired frequency responses. ... | 03/09/2010 |
| 7664276 | Multipass parametric or graphic EQ fitting Multiple passes are executed in the setup of an equalizer, and modification of the equalization is performed after each pass of an analysis phase. After an initial pass, the equalization is adjusted, based upon the location of peaks and valleys in the system respons... | 02/16/2010 |
| 7558390 | Listening device A method for equalizing output signals from a plurality of signal paths is disclosed. The method comprises steps of identifying a transfer function for each of signal paths, determining a filtering function for each signal path such that a product of the transfer fu... | 07/07/2009 |
| 7529377 | Loudspeaker with automatic calibration and room equalization A loudspeaker, such as a subwoofer, is provided which automatically calibrates itself when placed in a room to optimize an output signal of the loudspeaker for the room in which the loudspeaker is placed. ... | 05/05/2009 |
| 7483540 | Automatic audio system equalizing An automated process for equalizing an audio system and an apparatus for implementing the process. An audio system includes a microphone unit, for receiving the sound waves radiated from a plurality of speakers, acoustic measuring circuitry, for providing frequency ... | 01/27/2009 |
| 7466830 | Equalizing circuit amplifying bass range signal A low-frequency eliminating unit outputs a signal derived from attenuating the extreme bass range in an input audio signal, so as to reduce bass distortion. A high-frequency retrieving unit retrieves, from the signal output from the low-frequency eliminating unit, s... | 12/16/2008 |
| 7466829 | Dynamic bass equalization with modified sallen-key high pass filter A dynamic bass equalization circuit has an amplitude dependent gain that is dependent upon the audio electrical signal amplitude and a dynamically adjusted frequency response that varies with the amplitude dependent gain. In one implementation, the dynamic bass equa... | 12/16/2008 |
| 7466831 | Audio processing The present invention relates to audio signal processing such as equalisation and spatial enhancement functions. The present invention provides an audio signal processing circuit arrangement for two audio channels, and which combines spatial enhancement or acoustic ... | 12/16/2008 |
| 7443913 | High speed decision feedback equalizer An equalizer comprises a sampler, a filter, and a summer. The sampler samples a signal indicative of an input communication signal to determine digital decision output signals having a communication device data rate. The filter receives digital decision output signa... | 10/28/2008 |
| 7428308 | Transmitting and reproducing stereophonic audio signals Apparatus and method for transmitting and reproducing stereophonic audio signals are disclosed. The method comprises splitting first and second channels into two frequency bands, combining the lower frequency band signals of the two channels, and transmitting the co... | 09/23/2008 |
| 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 |
| 7403626 | Level adjustment apparatus Arrangements are made such that a plurality of operators, such as faders, can be set to opposite operational directions. When any one of the operators has been operated in a particular direction, a control value of each of the other operator, set to the same operati... | 07/22/2008 |
| 7390960 | Electronic signal processor An electronic signal processor for processing signals includes a complex first filter, one or more gain stages and a second filter. The first filter is characterized by a frequency response curve that includes multiple corner frequencies, with some corner frequencie... | 06/24/2008 |
| 7388959 | Harmonic generator and pre-amp A Harmonic Generator for audio applications and a Pre-Amplifier circuit are combined to form a Harmonic Generator and Pre-Amplifier circuit. The Harmonic Generator is formed from a Buffer Circuit responsive to an input program signal for buffering the input program ... | 06/17/2008 |
| 7366296 | Network support for voice path signal strength balancing Embodiments of the method and system provide for automatic balancing of audio signal strength levels on voice paths between first and second parties in a telecommunication system. The method in an embodiment may have the steps of: checking for a subscription to audi... | 04/29/2008 |
| 7363096 | Digital audio signal filtering mechanism and method Essentially all of the processing parameters which control processing of a source audio signal to produce an encoded audio signal are stored in an audio processing profile. Multiple audio processing profiles are stored in a processing profile database such that spec... | 04/22/2008 |
| 7352872 | Filter circuit and method for processing an audio signal The invention relates to a filter circuit for processing an audio signal, comprising a first branch in which the audio signal is guided in an essentially unchanged state to an output summation stage, and a second branch comprising several series-connected filter sta... | 04/01/2008 |
| 7346326 | Mobile communication terminal with equalizer function Disclosed is a mobile communication terminal which is provided with an equalizer function of audio equipment to adjust a timbre of transmitting/received speech sounds so as to satisfy a great number of users having various individualities and tastes simultaneously. ... | 03/18/2008 |
| 7340069 | System and method for split automatic gain control A system and method for automatically controlling gain in a signal chain are presented. A first signal is processed to produce a processed signal. A gain is adjustably applied to the processed signal using an automatic gain control (AGC) mechanism. A resulting signa... | 03/04/2008 |
| 7336793 | Loudspeaker system for virtual sound synthesis A sound system obtains a desired sound field from an array of sound sources arranged on a panel. The desired sound field allows a listener to perceive the sound as if the sound were coming from a live source and from a specified location. Setup of the sound system i... | 02/26/2008 |
| 7333618 | Ambient noise sound level compensation Systems and methods for ambient noise compensation are disclosed. One example of a system includes a variable amplifier, a source sound processor, an area sound processor, and an adjustment circuit. The variable amplifier adjusts an audio input signal to generate an... | 02/19/2008 |
| 7333863 | Recording and playback control system The invention is a system for recording and reading both program data and acoustical control data and playing back the data to optimize performance of audio reproduction and recreate the effect of an original acoustic environment. The system has a recording apparatu... | 02/19/2008 |
| 7328412 | Method and apparatus for displaying a gain control interface with non-linear gain levels A method for displaying a gain control interface having a gain level display with non-linear gain levels. The gain level display has a first end having an associated first pixel offset value and a second end having an associated second pixel offset value. A range of... | 02/05/2008 |
| 7324857 | Method to synchronize playback of multicast audio streams on a local network A method is provided for synchronizing the playback of a digital audio broadcast on a plurality of network output devices using a microphone near a source, embedded control codes, and the audio patterns from the network output devices. An optional, additional manual... | 01/29/2008 |
