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| Number | Title | Issue Date |
| 8116471 | Audio signal dereverberation A method of estimating the reverberations in an acoustic signal (y) comprises determining the frequency spectrum (Y) of the signal (y), providing a first parameter (α) indicative of the decay of the reverberations part (r) of the signal over time, and providing a s... | 02/14/2012 |
| 8103011 | Signal detection using multiple detectors Signal detectors are described herein. By way of example, a system for detecting signals can include a microphone signal detector, a loudspeaker signal detector, a signal discriminator and a decision component. When the microphone signal detector detects the presenc... | 01/24/2012 |
| 8073147 | Dereverberation method, apparatus, and program for dereverberation A dereverberation device includes a reverberation estimation unit for estimating a later reflection component by using information on an impulse response from a signal source to an observation point, a noise estimation unit, and a mixing unit. As a result, it is pos... | 12/06/2011 |
| 8041046 | Reverberation adjusting apparatus, reverberation adjusting method, reverberation adjusting program, recording medium on which the reverberation adjusting program is recorded, and sound field correcting system The present invention provides a sound field correcting system and a reverberation adjusting apparatus capable of correcting a reverberation time characteristic by an easy operation without setting a complicated parameter. A surround system 100 has a sound re... | 10/18/2011 |
| 8023662 | Reverberation adjusting apparatus, reverberation correcting method, and sound reproducing system The present invention provides a sound reproducing system capable of accurately analyzing a reverberation characteristic of amplified sound including an arrival direction of a reverberation component, which is more natural, and has higher realistic sensation. A surr... | 09/20/2011 |
| 7844059 | Dereverberation of multi-channel audio streams A system and process for dereverberation of multi-channel audio streams is presented which uses reverberation suppression techniques. In general, the present system and process builds a frequency dependent model of the reverberation decay and uses spectral subtracti... | 11/30/2010 |
| 7787635 | Dip filter frequency characteristic decision method Resonant frequencies f2 and f3 detected in a resonant space are determined as center frequencies of a dip. Based on measurement values at a speaker and a microphone in the resonant space, a basic amplitude frequency characteristic Ca and a target ampli... | 08/31/2010 |
| 7769186 | System and method facilitating acoustic echo cancellation convergence detection A system and method facilitating acoustic echo cancellation convergence detection is provided. The invention includes an acoustic echo cancellation convergence detector having a center clipping component, a convergence calculator, a convergence filter and a converge... | 08/03/2010 |
| 7764799 | Audio system providing for filter coefficient copying A system (1) is described which is suited for suppressing audio distortion. The system comprises echo cancelling means (g1, g2) coupled between an audio output (4) and a distorted desired audio sensing microphone array (3),... | 07/27/2010 |
| 7760887 | Updating modeling information based on online data gathering A system may include a processor and memory. The processor may be configured to perform calibration measurements on the speaker even when the speaker is being used to conduct a live conversation. The processor may be configured to: provide a live output signal for t... | 07/20/2010 |
| 7742607 | Method for designing a modal equalizer for a low frequency sound reproduction In a room with strong low-frequency modes the control of excessively long decays is problematic or impossible with conventional passive means. In this patent application a systematic methodology is presented for active modal equalization able to correct the modal de... | 06/22/2010 |
| 7720232 | Speakerphone A processor operates on samples of a digital output signal to determine samples of a digital correction signal. The output signal samples are directed to an output channel for transmission from a speaker. The digital correction signal samples are supplied to a first... | 05/18/2010 |
| 7697696 | Audio amplification apparatus with howling canceler In an audio amplification apparatus connected to a microphone and a speaker, an audio amplification circuit amplifies an audio signal and inputs the amplified audio signal to the speaker. A howling canceller has an adaptive filter which is set with a filter coeffici... | 04/13/2010 |
| 7693291 | Multi-channel frequency-domain adaptive filter method and apparatus The invention is a method and apparatus for frequency-domain adaptive filtering that has broad applications such as to equalizers, but is particularly suitable for use in acoustic echo cancellation circuits for stereophonic and other multiple channel teleconferencin... | 04/06/2010 |
| 7660425 | Acoustic echo cancellation A multiple channel steered spatialized signal is generated from a signal input modified according to respective spatialization gain functions to generate a plurality of audio channels. An echo cancellation signal is applied to a return path using a combined spatiali... | 02/09/2010 |
| 7574005 | Howling frequency component emphasis method and apparatus A method is designed for emphasizing a howling frequency component of a sound signal observed in an acoustic feedback system during an observation period having a predetermined length. The method is carried out by the steps of successively sampling the sound signal ... | 08/11/2009 |
| 7508948 | Reverberation removal A method of removing reverberation from audio signals is disclosed. The method comprises spectro-temporally analyzing the first audio signal and the second audio signal to derive an energy function of time for a plurality of frequency bands. The method further compr... | 03/24/2009 |
| 7415117 | System and method for beamforming using a microphone array The ability to combine multiple audio signals captured from the microphones in a microphone array is frequently used in beamforming systems. Typically, beamforming involves processing the output audio signals of the microphone array in such a way as to make the micr... | 08/19/2008 |
| 7366662 | Separation of target acoustic signals in a multi-transducer arrangement The present invention provides a process for separating a good quality information signal from a noisy acoustic environment. The separation process uses a set of at least two spaced-apart transducers to capture noise and information components. The transducer signal... | 04/29/2008 |
| 7362319 | Method and apparatus for auto-generation of horizontal synchronization of an analog signal to a digital display Determining a horizontal resolution and a phase of an analog video signal arranged to display a number of scan lines each formed of a number of pixels is described. A number of initialization values are set where at least one of the initialization values is a curren... | 04/22/2008 |
| 7353245 | Adaptive filter coefficient determination Operation of an adaptive filter includes determining a first filter coefficient and determining a second filter coefficient based on the first filter coefficient, in one embodiment, and in another embodiment includes comparing pseudo-error counts generated for each ... | 04/01/2008 |
| 7327852 | Method and device for separating acoustic signals In a method of separating acoustic signals from a plurality of sound sources comprising the following steps: disposing two microphones (MIK1, MIK2) at a predefined distance (d) from one another; picking up the acoustic signals with both microphones (MI... | 02/05/2008 |
| 7319748 | Device and method for suppressing echo in telephones The present invention relates to a suppression device for an arrangement for the transmission of audio signals, in particular uttered speech, having: an echo reduction unit (4), which is arranged between an input channel (1) for receiving an input audi... | 01/15/2008 |
| 7313519 | Transient performance of low bit rate audio coding systems by reducing pre-noise Distortion artifacts preceding a signal transient in an audio signal stream processed by a transform-based low-bit-rate audio coding system employing coding blocks are reduced by detecting a transient in the audio signal stream and shifting the temporal relationship... | 12/25/2007 |
| 7313233 | Tone clamping and replacement A method and apparatus to manage tone clamping are described. ... | 12/25/2007 |
| 7310425 | Multi-channel frequency-domain adaptive filter method and apparatus The invention is a method and apparatus for frequency-domain adaptive filtering that has broad applications such as to equalizers, but is particularly suitable for use in acoustic echo cancellation circuits for stereophonic and other multiple channel teleconferencin... | 12/18/2007 |
| 7304961 | Echo cancellation device for full duplex communication systems An echo cancellation device for a full duplex communications system is provided. The full duplex communication system has a transmitter for transmitting a transmit signal and a receiver for receiving a receive signal. The echo cancellation device has a filter for ou... | 12/04/2007 |
| 7289554 | Method and apparatus for channel equalization and cyclostationary interference rejection for ADSL-DMT modems A method and apparatus for efficient filter structure for an enhanced operation of an ADSL-DMT modem on a subscriber loop with an environment consisting of ISDN interference. The method performs equalization of the channel by impulse response shortening and at the s... | 10/30/2007 |
| 7286674 | Method for designing a modal equalizer for a low frequency audible range especially for closely positioned modes The present invention relates to a method for designing a modal equalizer (5) for a low frequency audible range, typically for frequencies below 200 Hz for a predetermined space (1) (listening room) and location (2) (location in the room) therei... | 10/23/2007 |
| 7280958 | Method and system for suppressing receiver audio regeneration The invention concerns a method (500) and system (100) for suppressing receiver audio regeneration. The method (500) includes the steps of receiving a communication signal (502), at a Radio Frequency (RF) unit (102), demodulating t... | 10/09/2007 |
| 7280943 | Systems and methods for separating multiple sources using directional filtering Systems and methods for performing source separation are provided. Source separation is performed using a composite signal and a signal dictionary. The composite signal is a mixture of sources received by a sensor. The signal dictionary is a database of filtered bas... | 10/09/2007 |
| 7274794 | Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in single wave sound environment A sound processing system including at least one microphone, an audio processor, and at least one output device. The audio processor includes an analog beamformer, a microphone equalizer, and an apparent incidence processor. Two different embodiments of the apparent... | 09/25/2007 |
| 7254242 | Acoustic signal processing apparatus and method, and audio device A first band analyzer divides an acoustic signal received from a sound playback system through an input unit into frequency bands, and generates a first band level. An acoustic signal estimator estimates the band level of the original acoustic signal at the input un... | 08/07/2007 |
| 7251213 | Method for remote measurement of echo path delay A method of measuring echo path delay in a circuit having echo cancellers after enabling an echo signal to pass through the echo cancellers. The known time for a given echo canceller to disable is subtracted from the overall test signal duration. This quantity can b... | 07/31/2007 |
| 7246059 | Method for fast dynamic estimation of background noise The invention provides a method and system for dynamically estimating background noise. The system includes a portable communication device, a vocoder, and a voice activated detector. Based on information received by the portable communication device, the vocoder de... | 07/17/2007 |
| 7243065 | Low-complexity comfort noise generator A comfort noise generator (104) suitable for use in a communication system includes a finite impulse response (FIR) filter (136), a random number generator (140), and a coefficient updater (138). The coefficient updater (138) deter... | 07/10/2007 |
| 7231234 | Method and apparatus for reducing echo in a communication system A method and apparatus for reducing echo in a communication system are provided. A first signal including a voice component associated to a speaker is received. The first signal is processed to derive a harmonic feature of the voice component. A second signal includ... | 06/12/2007 |
| 7215766 | Headset with auxiliary input jack(s) for cell phone and/or other devices Headsets are used in variety of applications to facilitate one- or two-way audio communications between users and/or devices. The present inventor recognized that conventional headsets lack means for successfully integrating more than one audio source, despite their... | 05/08/2007 |
| 7209566 | Method and apparatus for determining a nonlinear response function for a loudspeaker A nonlinear response function of a loudspeaker is determined by an iterative process during which the nonlinear response function and a linear response associated with an echo and microphone are alternately revised. ... | 04/24/2007 |
| 7206423 | Intrabody communication for a hearing aid Disclosed is a hearing aid that includes a first component operable to receive an input and a second component operable to provide an output to at least one ear of a user of the hearing aid. The first component and the second component are electrically coupled toget... | 04/17/2007 |
