Patent application number | Description | Published |
20080306739 | SOUND SOURCE SEPARATION SYSTEM - A system capable of separating sound source signals with high precision while improving a convergence rate and convergence precision. A process of updating a current separation matrix W | 12-11-2008 |
20090043588 | SOUND-SOURCE SEPARATION SYSTEM - A system capable of reducing the influence of sound reverberation or reflection to improve sound-source separation accuracy. An original signal X(ω,f) is separated from an observed signal Y(ω,f) according to a first model and a second model to extract an unknown signal E(ω,f). According to the first model, the original signal X(ω,f) of the current frame f is represented as a combined signal of known signals S(ω,f−m+1) (m=1 to M) that span a certain number M of current and previous frames. This enables extraction of the unknown signal E(ω,f) without changing the window length while reducing the influence of reverberation or reflection of the known signal S(ω,f) on the observed signal Y(ω,f). | 02-12-2009 |
20090063605 | SIGNAL PROCESSING DEVICE - A device capable of improving the convergence rate and estimation accuracy in estimating a correlation value. According to a signal processing device, since a window length is adjusted in such a manner to reduce an estimated error of a correlation matrix, the convergence rate and estimation accuracy in estimating the correlation matrix and the correlation value as its off-diagonal element can be improved. Then, in such a high-probability condition that the correlation of plural output signals according to a state is estimated with a high degree of precision, signal processing is performed on the plural signals, so that the state can be estimated with a high degree of precision. | 03-05-2009 |
20100011939 | ROBOT - A robot includes: a sound collecting unit collecting and converting a musical sound into a musical acoustic signal; a voice signal generating unit generating a self-vocalized voice signal; a sound outputting unit converting the self-vocalized voice signal into a sound and outputting the sound; a self-vocalized voice regulating unit receiving the musical acoustic signal and the self-vocalized voice signal; a filtering unit performing a filtering process; a beat interval reliability calculating unit performing a time-frequency pattern matching process and calculating a beat interval reliability; a beat interval estimating unit estimating a beat interval; a beat time reliability calculating unit calculating a beat time reliability; a beat time estimating unit estimating a beat time on the basis of the calculated beat time reliability; a beat time predicting unit predicting a beat time before the current time; and a synchronization unit synchronizing the self-vocalized voice signal. | 01-21-2010 |
20100017034 | BEAT TRACKING APPARATUS, BEAT TRACKING METHOD, RECORDING MEDIUM, BEAT TRACKING PROGRAM, AND ROBOT - A beat tracking apparatus includes: a filtering unit configured to perform a filtering process on an input acoustic signal and to accentuate an onset; a beat interval reliability calculating unit configured to perform a time-frequency pattern matching process employing a mutual correlation function on the acoustic signal of which the onset is accentuated and to calculate a beat interval reliability; and a beat interval estimating unit configured to estimate a beat interval on the basis of the calculated beat interval reliability. | 01-21-2010 |
20100054489 | DEREVERBERATION SYSTEM AND DEREVERBERATION METHOD - Provided is a dereverberation system or the like which copes with an arbitrary condition flexibly and is capable of recognizing a sound or a sound source signal. According to the dereverberation system, an inverse filter (h) is set by using a pseudo-inverse matrix (R | 03-04-2010 |
20100082340 | SPEECH RECOGNITION SYSTEM AND METHOD FOR GENERATING A MASK OF THE SYSTEM - The speech recognition system of the present invention includes: a sound source separating section which separates mixed speeches from multiple sound sources; a mask generating section which generates a soft mask which can take continuous values between 0 and 1 for each separated speech according to reliability of separation in separating operation of the sound source separating section; and a speech recognizing section which recognizes speeches separated by the sound source separating section using soft masks generated by the mask generating section. | 04-01-2010 |
20100208904 | DEREVERBERATION APPARATUS AND DEREVERBERATION METHOD - A dereverberation apparatus includes a signal selecting unit which selects a sound signal to be used for dereverberation process from a plurality of sound signals, and a dereverberation processing unit which performs the dereverberation process for the selected sound signal. | 08-19-2010 |
20100299145 | ACOUSTIC DATA PROCESSOR AND ACOUSTIC DATA PROCESSING METHOD - An acoustic data processor according to the present invention is used for processing acoustic data including signal sounds to reduce noises generated by a mechanical apparatus. The acoustic data processor includes a motion status obtaining section for obtaining motion status of the mechanical apparatus, an acoustic data obtaining section for obtaining acoustic data corresponding to the obtained motion status, and a database for storing various motion statuses of the mechanical apparatus in a unit time and corresponding acoustic data as templates. The acoustic data processor further includes a database searching section for searching the database to retrieve the template having the motion status closest to the obtained motion status; and a template subtraction section for subtracting the acoustic data of the template having the motion status closest to the obtained motion status from the obtained acoustic data to reduce noises generated by the mechanical apparatus. | 11-25-2010 |
20100329472 | REVERBERATION SUPPRESSING APPARATUS AND REVERBERATION SUPPRESSING METHOD - A reverberation suppressing apparatus separating sound source signals based on input signals output from microphones collecting the plurality of sound source signals, includes a sound signal output unit generating sound signals and outputting the generated sound signals, a sound acquiring unit acquiring the input signals from microphones, a first evaluation function calculation unit calculating a separation matrix, the input signals, and the sound source signals, and calculating a first evaluation function, a reverberation component suppressing unit calculating an optimal separation matrix, and suppressing a reverberation component by separating the sound source signals other than the generated sound signals, and a separation matrix updating unit dividing a step-size function, approximating each segment to a linear function, calculating step sizes based on the approximated linear functions, and repeatedly updating the separation matrix so that the degree of separation of the sound source signals exceeds the predetermined value. | 12-30-2010 |
20100329479 | SOUND SOURCE LOCALIZATION APPARATUS AND SOUND SOURCE LOCALIZATION METHOD - A sound source localization apparatus for localizing a sound source using an eigenvector, includes, a sound signal input unit inputting a sound signal, a correlation matrix calculation unit calculating a correlation matrix of the input sound signal, and an eigenvector calculation unit calculating an eigenvalue of the correlation matrix using the calculated correlation matrix, wherein the eigenvector calculation unit calculates the eigenvector using the correlation matrix of the input sound signal and one or more predetermined correlation matrices. | 12-30-2010 |
20110214554 | MUSICAL SCORE POSITION ESTIMATING APPARATUS, MUSICAL SCORE POSITION ESTIMATING METHOD, AND MUSICAL SCORE POSITION ESTIMATING PROGRAM - A musical score position estimating apparatus includes a sound feature quantity generating unit configured to generate a feature quantity of an input sound signal, and, a score position estimating unit configured to calculate a weight coefficient based on the feature quantity of the sound signal and a feature quantity of musical score information and estimates a musical score position using a virtual musical score position and a virtual tempo corresponding to the weight coefficient. | 09-08-2011 |
20110224977 | ROBOT, METHOD AND PROGRAM OF CONTROLLING ROBOT - A robot may include a driving control unit configured to control a driving of a movable unit that is connected movably to a body unit, a voice generating unit configured to generate a voice, and a voice output unit configured to output the voice, which has been generated by the voice generating unit. The voice generating unit may correct the voice, which is generated, based on a bearing of the movable unit, which is controlled by the driving control unit, to the body unit. | 09-15-2011 |
20110268283 | REVERBERATION SUPPRESSING APPARATUS AND REVERBERATION SUPPRESSING METHOD - A reverberation suppressing apparatus, includes: a sound acquiring unit which acquires a sound signal; a reverberation data computing unit which computes reverberation data from the acquired sound signal; a reverberation characteristics estimating unit which estimates reverberation characteristics based on the computed reverberation data; a filter length estimating unit which estimates a filter length of a filter which is used to suppress a reverberation based on the estimated reverberation characteristics; and a reverberation suppressing unit which suppresses the reverberation based on the estimated filter length. | 11-03-2011 |
20120045066 | SOUND SOURCE SEPARATION APPARATUS AND SOUND SOURCE SEPARATION METHOD - A sound source separation apparatus includes a transfer function storage unit that stores a transfer function from a sound source, a sound change detection unit that generates change state information indicating a change of the sound source on the basis of an input signal input from a sound input unit, a parameter selection unit that calculates an initial separation matrix on the basis of the change state information generated by the sound change detection unit, and a sound source separation unit that separates the sound source from the input signal input from the sound input unit using the initial separation matrix calculated by the parameter selection unit. | 02-23-2012 |
20120069714 | SOUND DIRECTION ESTIMATION APPARATUS AND SOUND DIRECTION ESTIMATION METHOD - A sound direction estimation apparatus includes a sound source model storage unit that stores likelihood of a sound source class in correspondence with a sound feature quantity, a sound signal input unit that receives a sound signal, a sound source identification unit that identifies a sound source class of the sound signal input from the sound signal input unit with reference to the sound source model storage unit based on the sound feature quantity of the sound signal, and a first sound source localization unit that estimates a sound direction of the sound signal of the sound source class identified by the sound source identification unit. | 03-22-2012 |
20120095753 | NOISE POWER ESTIMATION SYSTEM, NOISE POWER ESTIMATING METHOD, SPEECH RECOGNITION SYSTEM AND SPEECH RECOGNIZING METHOD - A noise power estimation system for estimating noise power of each frequency spectral component includes a cumulative histogram generating section for generating a cumulative histogram for each frequency spectral component of a time series signal, in which the horizontal axis indicates index of power level and the vertical axis indicates cumulative frequency and which is weighted by exponential moving average; and a noise power estimation section for determining an estimated value of noise power for each frequency spectral component of the time series signal based on the cumulative histogram. | 04-19-2012 |
20120095761 | SPEECH RECOGNITION SYSTEM AND SPEECH RECOGNIZING METHOD - A speech recognition system and a speech recognizing method for high-accuracy speech recognition in the environment with ego noise are provided. A speech recognition system according to the present invention includes a sound source separating and speech enhancing section; an ego noise predicting section; and a missing feature mask generating section for generating missing feature masks using outputs of the sound source separating and speech enhancing section and the ego noise predicting section; an acoustic feature extracting section for extracting an acoustic feature of each sound source using an output for said each sound source of the sound source separating and speech enhancing section; and a speech recognizing section for performing speech recognition using outputs of the acoustic feature extracting section and the missing feature masks. | 04-19-2012 |
20120195436 | Sound Source Position Estimation Apparatus, Sound Source Position Estimation Method, And Sound Source Position Estimation Program - A sound source position estimation apparatus includes a signal input unit that receives sound signals of a plurality of channels; a time difference calculating unit that calculates a time difference between the sound signals of the channels, a state predicting unit that predicts present sound source state information from previous sound source state information which is sound source state information including a position of a sound source, and a state updating unit that estimates the sound source state information so as to reduce an error between the time difference calculated by the time difference calculating unit and the time difference based on the sound source state information predicted by the state predicting unit. | 08-02-2012 |
20120330659 | INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING SYSTEM, INFORMATION PROCESSING METHOD, AND INFORMATION PROCESSING PROGRAM - An information processing device includes a display data creating unit configured to create display data including characters representing the content of an utterance based on a sound and a symbol surrounding the characters and indicating a first direction, and an image combining unit configured to determine the position of the display data based on a display position of an image representing a sound source of the utterance, and to combine the display data and the image of the sound source so that an orientation in which the sound is radiated is matched with the first direction. | 12-27-2012 |
20130010974 | SOUND PROCESSING DEVICE, SOUND PROCESSING METHOD, AND SOUND PROCESSING PROGRAM - A sound processing device includes a storage unit configured to store first operation data corresponding to a motion of a mechanical apparatus and a first sound feature value corresponding to the motion in correlation with each other, a noise estimating unit configured to estimate a third sound feature value corresponding to a noise component based on a second sound feature value corresponding to an acquired sound signal, a sound feature value processing unit configured to calculate a target sound feature value from which the noise component is removed based on the second sound feature value and the third sound feature value, and an updating unit that updates the first sound feature value stored in the storage unit based on detected second operation data and the third sound feature value estimated by the noise estimating unit. | 01-10-2013 |
20130151249 | INFORMATION PRESENTATION DEVICE, INFORMATION PRESENTATION METHOD, INFORMATION PRESENTATION PROGRAM, AND INFORMATION TRANSMISSION SYSTEM - An information presentation device includes an audio signal input unit configured to input an audio signal, an image signal input unit configured to input an image signal, an image display unit configured to display an image indicated by the image signal, a sound source localization unit configured to estimate direction information for each sound source based on the audio signal, a sound source separation unit configured to separate the audio signal to sound-source-classified audio signals for each sound source, an operation input unit configured to receive an operation input and generates coordinate designation information indicating a part of a region of the image, and a sound source selection unit configured to select a sound-source-classified audio signal of a sound source associated with a coordinate which is included in a region indicated by the coordinate designation information, and which corresponds to the direction information. | 06-13-2013 |
20140029758 | ACOUSTIC SIGNAL PROCESSING DEVICE, ACOUSTIC SIGNAL PROCESSING METHOD, AND ACOUSTIC SIGNAL PROCESSING PROGRAM - An acoustic signal processing device includes a frequency domain transform unit configured to transform an acoustic signal to a frequency domain signal for each channel, a filter coefficient calculation unit configured to calculate at least two sets of filter coefficients of a filter for each section having a predefined number of frames with respect to a sampled signal obtained by sampling the frequency domain signal transformed by the frequency domain transform unit for each frame such that the magnitude of a residual calculated based on a filter compensating for the difference in transfer characteristics between the channels of the acoustic signal is minimized, and an output signal calculation unit configured to calculate an output signal of a frequency domain based on the frequency domain signal transformed by the frequency domain transform unit and at least two sets of filter coefficients calculated by the filter coefficient calculation unit. | 01-30-2014 |
20140067385 | SOUND PROCESSING DEVICE, SOUND PROCESSING METHOD, AND SOUND PROCESSING PROGRAM - A sound processing device includes a separation unit configured to separate at least a music signal and a speech signal from a recorded audio signal, a noise suppression unit, a music feature value estimation unit, a speech recognition unit, a noise-processing confidence calculation unit, a music feature value estimation confidence calculation unit, a speech recognition confidence calculation unit, and a control unit configured to calculate at least one behavioral decision function of a speech behavioral decision function associated with speech and a music behavioral decision function associated with music based on a noise-processing confidence value, a music feature value estimation confidence value, and a speech recognition confidence value and to determine behavior corresponding to the calculated behavioral decision function. | 03-06-2014 |
20140072142 | SOUND DIRECTION ESTIMATION DEVICE, SOUND PROCESSING SYSTEM, SOUND DIRECTION ESTIMATION METHOD, AND SOUND DIRECTION ESTIMATION PROGRAM - A sound direction estimation device includes a first correlation matrix calculation unit configured to calculate a correlation matrix of a plurality of channels of input sound signals, a second correlation matrix calculation unit configured to calculate a correlation matrix of noise signals based on the plurality of channels of sound signals, and a sound source localization unit configured to calculate a spatial spectrum based on the correlation matrix calculated by the first correlation matrix calculation unit and the correlation matrix calculated by the second correlation matrix calculation unit and to estimate a direction of a sound source associated with the plurality of channels of sound signals using the calculated spatial spectrum. | 03-13-2014 |
20140078867 | SOUND DIRECTION ESTIMATION DEVICE, SOUND DIRECTION ESTIMATION METHOD, AND SOUND DIRECTION ESTIMATION PROGRAM - A sound direction estimation device includes a transfer function storage unit configured to store transfer functions of sound sources in correlation with directions of the sound sources, a calculation unit configured to calculate the number of classes to be searched and a search interval for each class based on a desired search range and a desired spatial resolution for searching for the directions of the sound sources, and a sound source localization unit configured to search the search range for every search interval using the transfer function, to estimate the direction of the sound source based on the search result, to update the search range and the search interval based on the estimated direction of the sound source until the number of classes calculated by the calculation unit is reached, and to estimate the direction of the sound source. | 03-20-2014 |
20140200887 | SOUND PROCESSING DEVICE AND SOUND PROCESSING METHOD - A sound processing device includes a noise suppression unit configured to suppress a noise component included in an input sound signal, an auxiliary noise addition unit configured to add auxiliary noise to the input sound signal, whose noise component has been suppressed by the noise suppression unit, to generate an auxiliary noise-added signal, a distortion calculation unit configured to calculate a degree of distortion of the auxiliary noise-added signal, and a control unit configured to control an addition amount by which the auxiliary noise addition unit adds the auxiliary noise based on the degree of distortion calculated by the distortion calculation unit. | 07-17-2014 |
20140214418 | SOUND PROCESSING DEVICE AND SOUND PROCESSING METHOD - A sound processing device includes a first noise suppression unit configured to suppress a noise component included in an input sound signal using a first suppression amount, a second noise suppression unit configured to suppress the noise component included in the input sound signal using a second suppression amount greater than the first suppression amount, a speech section detection unit configured to detect whether the sound signal whose noise component has been suppressed by the second noise suppression unit includes a speech section having a speech for every predetermined time, and a speech recognition unit configured to perform a speech recognizing process on a section, which is detected to be a speech section by the speech section detection unit, in the sound signal whose noise component has been suppressed by the first noise suppression unit. | 07-31-2014 |
20140278372 | AMBIENT SOUND RETRIEVING DEVICE AND AMBIENT SOUND RETRIEVING METHOD - An ambient sound retrieving device includes a sound input unit receiving a sound signal, a sound recognition unit performing a speech recognition process on the sound signal and generating an onomatopoeic word, a sound data storage unit storing an ambient sound and an onomatopoeic word corresponding to the ambient sound, a correlation information storage unit storing correlation information in which a first onomatopoeic word, a second onomatopoeic word, and a frequency of selecting the second onomatopoeic word are correlated with each other, a conversion unit converting the first onomatopoeic word into the second onomatopoeic word corresponding to the first onomatopoeic word using the correlation information, and a retrieval and extraction unit extracting the ambient sound corresponding to the second onomatopoeic word from the sound data storage unit and ranking and presenting a plurality of candidates of the extracted ambient sound. | 09-18-2014 |
20140286504 | MICROPHONE ARRAY ARRANGEMENT STRUCTURE IN VEHICLE CABIN - A microphone array arrangement structure in a vehicle cabin is provided with multiple microphones arranged in a convex line. The microphones include a first microphone, and the direction of the axis of the first microphone faces the mouth of the driver. The microphone array arrangement structure is provided with covers housing the microphones and having multiple holes. The front surface of the covers form a convexly curved line, and each of the microphones is fixed inside of a cover to correspond to one of the holes. | 09-25-2014 |
20150063069 | SOUND PROCESSING DEVICE, SOUND PROCESSING METHOD, AND SOUND PROCESSING PROGRAM - A sound processing device includes a sound collection unit configured to record a sound signal, a tilt information acquisition unit configured to acquire tilt information on a tilt of the sound processing device, an azimuth estimation unit configured to estimate azimuths of a sound source in a plane in which the sound collection unit is arranged based on the sound signals which are recorded by the sound collection unit at least at two times; and an elevation angle estimation unit configured to estimate an elevation angle of the sound source with respect to the plane in which the sound collection unit is arranged based on the tilt information acquired by the tilt information acquisition unit and the azimuths estimated by the azimuth estimation unit at least at two times. | 03-05-2015 |
20150066500 | SPEECH PROCESSING DEVICE, SPEECH PROCESSING METHOD, AND SPEECH PROCESSING PROGRAM - A speech processing device includes a speech recognition unit configured to sequentially recognize recognition segments from an input speech, a reverberation influence storage unit configured to store a degree of reverberation influence indicating an influence of a reverberation based on a preceding speech to a subsequent speech subsequent to the preceding speech and a recognition segment group including a plurality of recognition segments in correlation with each other, a reverberation influence selection unit configured to select the degree of reverberation influence corresponding to the recognition segment group which includes the plurality of recognition segments recognized by the speech recognition unit from the reverberation influence storage unit, and a reverberation reduction unit configured to remove a reverberation component weighted with the degree of reverberation influence from the speech from which at least a part of recognition segments of the recognition segment group is recognized. | 03-05-2015 |
20150066507 | SOUND RECOGNITION APPARATUS, SOUND RECOGNITION METHOD, AND SOUND RECOGNITION PROGRAM - A sound recognition apparatus can include a sound feature value calculating unit configured to calculate a sound feature value based on a sound signal, and a label converting unit configured to convert the sound feature value into a corresponding label with reference to label data in which sound feature values and labels indicating sound units are correlated. A sound identifying unit is configured to calculate a probability of each sound unit group sequence that a label sequence is segmented for each sound unit group with reference to segmentation data. The segmentated data indicates a probability that a sound unit sequence will be segmented into at least one sound unit group. The sound identity unit can also identify a sound event corresponding to the sound unit group sequence selected based on the calculated probability. | 03-05-2015 |
20150088497 | SPEECH PROCESSING APPARATUS, SPEECH PROCESSING METHOD, AND SPEECH PROCESSING PROGRAM - A speech processing apparatus includes a sound collecting unit configured to collect sound signals, a sound source direction estimating unit configured to estimate a direction of a sound source of each sound signal collected by the sound collecting unit, a reverberation reducing filter calculating unit configured to calculate a reverberation reducing filter to be applied to the sound signals collected by the sound collecting unit, and a reduction processing unit configured to apply the reverberation reducing filter calculated by the reverberation reducing filter calculating unit to the sound signals, and the reverberation reducing filter calculating unit calculates the reverberation reducing filter to be applied based on the directions of the sound sources estimated by the sound source direction estimating unit. | 03-26-2015 |