| Patent application number | Description | Published |
|---|
| 20080208577 | Multi-stage speech recognition apparatus and method - Provided are a multi-stage speech recognition apparatus and method. The multi-stage speech recognition apparatus includes a first speech recognition unit performing initial speech recognition on a feature vector, which is extracted from an input speech signal, and generating a plurality of candidate words; and a second speech recognition unit rescoring the candidate words, which are provided by the first speech recognition unit, using a temporal posterior feature vector extracted from the speech signal. | 08-28-2008 |
| 20090060222 | Sound zoom method, medium, and apparatus - A sound zoom method, medium, and apparatus generating a signal in which a target sound is removed from sound signals input to a microphone-array by adjusting a null width that restricts a directivity sensitivity of the microphone array, and extracting a signal corresponding to the target sound from the sound signals by using the generated signal. Thus, a sound located at a predetermined position away from the microphone array can be selectively obtained so that a target sound is efficiently obtained. | 03-05-2009 |
| 20090086998 | Method and apparatus for identifying sound sources from mixed sound signal - A method and apparatus for discriminating sound sources from a mixed sound is provided. The method includes separating sound source signals from a mixed sound signal including a plurality of sound source signals that are input through a microphone array, estimating a transfer function of a mixing channel mixing the plurality of sound source signals from relationships between the mixed sound signal and the separated sound source signals, obtaining input signals of the microphone array by multiplying the estimated transfer function by the separated sound source signals, and calculating location information of each sound source using a predetermined sound source location estimation method based on the obtained input signals. | 04-02-2009 |
| 20090097360 | Method and apparatus for measuring sound source distance using microphone array - A method and apparatus for measuring a distance to a sound source. The method includes combining sound source signals input through at least two microphones and generating at least two microphone output signals, and performing an operation on the generated microphone output signals and calculating a distance to a sound source by using the relationship between a result of the operation and a frequency of the input sound source signals. Accordingly, regardless of the strength of a sound source, the distance to a sound source can be measured. | 04-16-2009 |
| 20090097670 | Method, medium, and apparatus for extracting target sound from mixed sound - A method, medium, and apparatus for extracting a target sound from mixed sound. The method includes receiving a mixed signal through a microphone array, generating a first signal whose directivity is emphasized toward a target sound source and a second signal whose directivity toward the target sound source is suppressed based on the mixed signal, and extracting a target sound signal from the first signal by masking an interference sound signal, which is contained in the first signal, based on a ratio of the first signal to the second signal. Therefore, a target sound signal can be clearly separated from a mixed sound signal which contains a plurality of sound signals and is input to a microphone array. | 04-16-2009 |
| 20090129609 | Method and apparatus for acquiring multi-channel sound by using microphone array - Provided are a method and an apparatus for acquiring a multi-channel sound by using a microphone array. The method estimates positions of sound sources corresponding to sound source signals, which are mixed together, from the sound source signals input via a microphone array; and generates a multi-channel sound source signal by compensating for the sound source signals, based on differences between the estimated positions of the sound sources and a position of a virtual microphone array substituting for the microphone array. By doing so, the multi-channel sound having a stereoscopic effect can be acquired from a plurality of distant sound source signals which are input via the microphone array from a portable sound acquisition device. | 05-21-2009 |
| 20090129610 | Method and apparatus for canceling noise from mixed sound - A method, medium, and apparatus canceling noise from a mixed sound. The method includes receiving sound source signals including a target sound and noise, extracting at least one feature vector indicating an attribute difference between the sound source signals from the sound source signals, calculating a suppression coefficient considering ratios of noise to the sound source signals based on the at least one extracted feature vector, and canceling the sound source signals corresponding to noise by controlling an intensity of an output signal generated from the sound source signals according to the calculated suppression coefficient. Accordingly, a clear target sound source signal can be obtained. | 05-21-2009 |
| 20090141908 | Distance based sound source signal filtering method and apparatus - Provided is a sound source signal filtering method and apparatus. The sound source signal filtering method includes: generating two or more microphone output signals by combining sound source signals input through a plurality of microphones; calculating distances between the microphones and a sound source from which the sound source signals are emitted by using distance relationships according to frequencies of the sound source signals extracted from the generated microphone output signals; and filtering the sound source signals to obtain one or more sound source signals corresponding to a predetermined distance by using the calculated distances. Accordingly, it is possible to obtain only sound source signals emitted from a sound source at a particular distance from the microphone array among a plurality of sound source signals input through the microphone array. | 06-04-2009 |
| 20090279715 | Method, medium, and apparatus for extracting target sound from mixed sound - A method, medium, and apparatus for extracting a target sound from a mixed sound. The method includes obtaining the mixed signal from a microphone array, generating a first signal which is emphasized and directed toward a target sound source, and a second signal which is suppressed and directed toward the target sound source, calculating a non-linear filter which is adaptive to at least one of an amplitude ratio of the first signal to the second signal in a time-frequency domain, frequencies of the first and second signals, and a ratio of an interference signal to the mixed signal, and filtering the first signal by the non-linear filter. | 11-12-2009 |
| 20100114570 | APPARATUS AND METHOD FOR RESTORING VOICE - An apparatus and a method for restoring voice are provided. The apparatus reduces noise included in a voice signal input to a microphone and outputs a voice signal having reduced noise, detects harmonic frequencies from the voice signal having reduced noise, and restores the voice signal having reduced noise approximate to its original state before being input to the microphone according to detected harmonic frequencies of the voice signal having reduced noise. | 05-06-2010 |
| 20100251220 | METHOD AND APPARATUS FOR DYNAMICALLY INSTRUMENTING A PROGRAM - A dynamic instrumentation method and apparatus which may trace, debug, and profile the execution of a running program without affecting the operation of the program, are provided. According to the method, a break instruction is inserted and executed at start of execution of a first instruction and immediately after execution of the last instruction of a function constituting the program. Environment values of the function before and after execution may be identified. The program may be dynamically instrumented without being affected by any tracing or debugging operations. | 09-30-2010 |
| 20100254539 | APPARATUS AND METHOD FOR EXTRACTING TARGET SOUND FROM MIXED SOURCE SOUND - A technology for eliminating or reducing interference sound from a sound signal to extract target sound is provided. Interference sound is modeled using training noise, and mixed source sound is separated using the modeled interference sound. The mixed source sound is separated into target sound and interference sound using a basis matrix of the modeled interference sound. | 10-07-2010 |
| 20110075859 | APPARATUS FOR GAIN CALIBRATION OF A MICROPHONE ARRAY AND METHOD THEREOF - An apparatus and method for calibrating gain difference between microphones included in a microphone array are provided. In the gain calibrating apparatus, weights for each frequency component of the acoustic signals, which have been converted into the signals in the frequency domain are calculated. The weights are used to calibrate the acoustic signals such that the plurality of acoustic signals each have the same amplitude while the acoustic signals maintain their individual phase. The amplitudes of the acoustic signals are calibrated by use of the calculated weights. The gain calibrating apparatus calibrates gain in real time while calculating weights for frequency components of the frame of acoustic signals in real time. | 03-31-2011 |
