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| Number | Title | Issue Date |
| 7797156 | Speech analyzing system with adaptive noise codebook Presented herein are systems and methods for generating an adaptive noise codebook for use with electronic speech systems. The noise codebook includes a plurality of entries which may be updated based on environmental noise sounds. The speech system includes a speec... | 09/14/2010 |
| 7769585 | System and method of voice activity detection in noisy environments An efficient voice activity detection method and system suitable for real-time operation in low SNR (signal-to-noise) environments corrupted by non-Gaussian non-stationary background noise. The method utilizes rank order statistics to generate a binary voice detecti... | 08/03/2010 |
| 7761294 | Speech distinction method A speech distinction method, which includes dividing an input voice signal into a plurality of frames, obtaining parameters from the divided frames, modeling a probability density function of a feature vector in state j for each frame using the obtained parameters, ... | 07/20/2010 |
| 7756707 | Signal processing apparatus and method A signal processing apparatus and method for performing a robust endpoint detection of a signal are provided. An input signal sequence is divided into frames each of which has a predetermined time length. The presence of the signal in the frame is detected. After th... | 07/13/2010 |
| 7752042 | Methods and apparatus to operate an audience metering device with voice commands Methods and apparatus to operate an audience metering device with voice commands are described herein. An example method to identify audience members based on voice, includes: obtaining an audio input signal including a program audio signal and a human voice signal;... | 07/06/2010 |
| 7729909 | Block-diagonal covariance joint subspace tying and model compensation for noise robust automatic speech recognition Model compression is combined with model compensation. Model compression is needed in embedded ASR to reduce the size and the computational complexity of compressed models. Model-compensation is used to adapt in real-time to changing noise environments. The present ... | 06/01/2010 |
| 7729908 | Joint signal and model based noise matching noise robustness method for automatic speech recognition A noise robustness method operates jointly in a signal domain and a model domain. For example, energy is added in the signal domain for frequency bands where an actual noise level of an incoming signal is lower than a noise level used to train models, thus obtaining... | 06/01/2010 |
| 7725315 | Minimization of transient noises in a voice signal A voice enhancement system is provided for improving the perceptual quality of a processed voice signal. The system improves the perceptual quality of a received voice signal by removing unwanted noise from a voice signal recorded by a microphone or from some other ... | 05/25/2010 |
| 7725314 | Method and apparatus for constructing a speech filter using estimates of clean speech and noise A method and apparatus identify a clean speech signal from a noisy speech signal. To do this, a clean speech value and a noise value are estimated from the noisy speech signal. The clean speech value and the noise value are then used to define a gain on a filter. Th... | 05/25/2010 |
| 7720679 | Speech recognition apparatus, speech recognition apparatus and program thereof Provided is a method for canceling background noise of a sound source other than a target direction sound source in order to realize highly accurate speech recognition, and a system using the same. In terms of directional characteristics of a microphone array, due t... | 05/18/2010 |
| 7711558 | Apparatus and method for detecting voice activity period An apparatus and method for detecting a voice activity period. The apparatus for detecting a voice activity period includes a domain conversion module that converts an input signal into a frequency domain signal in the unit of a frame obtained by dividing the input ... | 05/04/2010 |
| 7698135 | Voice detecting method and apparatus using a long-time average of the time variation of speech features, and medium thereof A first filter (2061 in FIG. 1) calculates a long-time average of first change quantities based on a difference between a line spectral frequency of an input voice signal and a long-time average thereof. A second filter (2062 in FIG. 1) c... | 04/13/2010 |
| 7684983 | Speech recognition apparatus and vehicle incorporating speech recognition apparatus When a voice input is detected as being applied to a directional microphone, sounds output from selected loudspeakers from among a plurality of loudspeakers, which otherwise would obstruct the speech recognition process, are attenuated, and sound signals supplied to... | 03/23/2010 |
| 7684982 | Noise reduction and audio-visual speech activity detection A noise reduction system including an audio-visual user interface combines visual features extracted from a digital video sequence with audio features extracted from an analog audio sequence. The digital video sequence may show the face of a speaker, and the analog ... | 03/23/2010 |
| 7680656 | Multi-sensory speech enhancement using a speech-state model A method and apparatus determine a likelihood of a speech state based on an alternative sensor signal and an air conduction microphone signal. The likelihood of the speech state is used, together with the alternative sensor signal and the air conduction microphone s... | 03/16/2010 |
| 7680657 | Auto segmentation based partitioning and clustering approach to robust endpointing Possible segmentations for an audio signal are scored based on distortions for feature vectors of the audio signal and the total number of segments in the segmentation. The scores are used to select a segmentation and the selected segmentation is used to identify a ... | 03/16/2010 |
| 7680655 | Method and apparatus for measuring the quality of speech transmissions that use speech compression A method and apparatus are provided for determining the quality of a speech transmission, including temporal clipping, delay and jitter, using a carefully constructed test signal (300) and digital signal processing techniques. The test signal that is to be tr... | 03/16/2010 |
| 7676363 | Automated speech recognition using normalized in-vehicle speech A speech recognition method includes the steps of receiving speech in a vehicle, extracting acoustic data from the received speech, and applying a vehicle-specific inverse impulse response function to the extracted acoustic data to produce normalized acoustic data. ... | 03/09/2010 |
| 7664637 | Audio-visual codebook dependent cepstral normalization An arrangement for yielding enhanced audio features towards the provision of enhanced audio-visual features for speech recognition. Input is provided in the form of noisy audio-visual features and noisy audio features related to the noisy audio-visual features. ... | 02/16/2010 |
| 7630891 | Voice region detection apparatus and method with color noise removal using run statistics The present invention relates to a voice region detection apparatus and method capable of accurately detecting a voice region even in a voice signal with color noise. The voice region detection method comprises the steps of, if a voice signal is input, dividing the ... | 12/08/2009 |
| 7610199 | Method and apparatus for obtaining complete speech signals for speech recognition applications The present invention relates to a method and apparatus for obtaining complete speech signals for speech recognition applications. In one embodiment, the method continuously records an audio stream comprising a sequence of frames to a circular buffer. When a user co... | 10/27/2009 |
| 7596496 | Voice activity detection apparatus and method A voice activity detection method comprising the steps of (a) Estimating in a noise power estimator the noise power within a signal having a speech component and a noise component, and (b) Calculating a likelihood ratio for the presence of speech in the signal from ... | 09/29/2009 |
| 7593852 | Speech compression system and method The invention improves the encoding and decoding of speech by focusing the encoding on the perceptually important characteristics of speech. The system analyzes selected features of an input speech signal, and first performing a common frame based speech coding of a... | 09/22/2009 |
| 7584097 | System and method for noisy automatic speech recognition employing joint compensation of additive and convolutive distortions A system for, and method of, noisy automatic speech recognition employing joint compensation of additive and convolutive distortions and a digital signal processor incorporating the system or the method. In one embodiment, the system includes: (1) an additive distor... | 09/01/2009 |
| 7571095 | Method and apparatus for recognizing speech in a noisy environment An apparatus and a concomitant method for recognizing speech in a noisy environment are provided. The present method includes applying a first interpolation weight to a clean speech model to produce a weighted clean speech model, applying a second interpolation weig... | 08/04/2009 |
| 7567900 | Harmonic structure based acoustic speech interval detection method and device A harmonic structure acoustic signal detection device not depending on the level fluctuation of the input signal including: an FFT unit which performs FFT on an input signal and calculates a power spectrum component for each frame; a harmonic structure extraction un... | 07/28/2009 |
| 7552050 | Speech recognition system and method utilizing adaptive cancellation for talk-back voice A voice recognition system includes an adaptive filter and a subtractor. The adaptive filter generates a simulated talk-back voice y(n) by setting a filter coefficient simulating a transfer system in which an input voice corresponding to a voice command and a talk-b... | 06/23/2009 |
| 7539616 | Speaker authentication using adapted background models Speaker authentication is performed by determining a similarity score for a test utterance and a stored training utterance. Computing the similarity score involves determining the sum of a group of functions, where each function includes the product of a posterior p... | 05/26/2009 |
| 7529664 | Signal decomposition of voiced speech for CELP speech coding An approach for improving quality of synthesized speech is presented. The input speech or residual is first separated into a voiced portion and a noise portion. The voice portion is coded using CELP methods. The noise portion of the input speech may be estimated at ... | 05/05/2009 |
| 7516069 | Middle-end solution to robust speech recognition A method for performing time and frequency Signal-to-Noise Ratio (SNR) dependent weighting in speech recognition is described that includes for each period t estimating the SNR to get time and frequency SNR information ηt,f; calculating the time and freq... | 04/07/2009 |
| 7509256 | Feature extraction apparatus and method and pattern recognition apparatus and method It is intended to increase the recognition rate in speech recognition and image recognition. An observation vector as input data, which represents a certain point in the observation vector space, is mapped to a distribution having a spread in the feature vector spac... | 03/24/2009 |
| 7480614 | Energy feature extraction method for noisy speech recognition The present invention provides an energy feature extraction method for noisy speech recognition. At first, noisy speech energy of an input noisy speech is computed. Next, the noise energy in the input noisy speech is estimated. Then, the estimated noise energy is su... | 01/20/2009 |
| 7478041 | Speech recognition apparatus, speech recognition apparatus and program thereof Provided is a method for canceling background noise of a sound source other than a target direction sound source in order to realize highly accurate speech recognition, and a system using the same. In terms of directional characteristics of a microphone array, due t... | 01/13/2009 |
| 7478042 | Speech decoder that detects stationary noise signal regions A first determiner 121 tentatively determines whether the current processing unit represents a stationary noise period, based on stationary properties of a decoded signal. Based on the tentative determination result and a determination result of the periodici... | 01/13/2009 |
| 7478043 | Estimation of speech spectral parameters in the presence of noise A speech analysis system includes a codebook (230) that stores speech spectral parameters corresponding to a speech spectral hypothesis. The speech spectral hypothesis may be combined with a noise spectral hypothesis and the combined hypothesis compared to a ... | 01/13/2009 |
| 7475012 | Signal detection using maximum a posteriori likelihood and noise spectral difference Robust signal detection against various types of background noise is implemented. According to a signal detection apparatus, the feature amount of an input signal sequence and the feature amount of a noise component contained in the signal sequence are extracted. Af... | 01/06/2009 |
| 7454335 | Method and system for reducing effects of noise producing artifacts in a voice codec There is provided a method of reducing effect of noise producing artifacts in silence areas of a speech signal for use by a speech decoding system. The method comprises obtaining a plurality of incoming samples of a speech subframe; summing an absolute value of an e... | 11/18/2008 |
| 7451083 | Removing noise from feature vectors A method and computer-readable medium are provided for identifying clean signal feature vectors from noisy signal feature vectors. One aspect of the invention includes using an iterative approach to identify the clean signal feature vector. Another aspect of the inv... | 11/11/2008 |
| 7451082 | Noise-resistant utterance detector A method and detector for providing a noise resistant utterance detector is provided by extracting a noise estimate (15) to augment the signal-to-noise ratio of the speech signal, inverse filtering (17) of the speech signal to focus on the periodic exc... | 11/11/2008 |
| 7440891 | Speech processing method and apparatus for improving speech quality and speech recognition performance A speech processing apparatus which, in the process of performing echo canceling by using a pseudo acoustic echo signal, continuously uses an impulse response used for the previous frame as an impulse response to generate the pseudo acoustic echo signal when a voice... | 10/21/2008 |
