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| Number | Title | Issue Date |
| 6910010 | Feature extraction apparatus and method and pattern recognition apparatus and method A feature extraction and pattern recognition system in which an observation vector forming input data, which represents a certain point in the observation vector space, is mapped to a distribution having a spread in the feature vector space, and a feature distributi... | 06/21/2005 |
| 6909759 | Wireless receiver using noise levels for postscaling an equalized signal having temporal diversity A wireless receiver for receiving an incoming signal having spatial and temporal diversity. The receiver uses noise-based prescaling of multiple receiver chain signals for optimally combining the receiver chain signals in a composite equalized signal and uses noise-... | 06/21/2005 |
| 6910011 | Noisy acoustic signal enhancement A system and method for enhancing acoustic signal buried in noise. The invention matches the acoustic input to a signal model and produces a corresponding output that has very low noise. Input data are digitized, transformed to a time-frequency representation, backg... | 06/21/2005 |
| 6907436 | Method for classifying data using clustering and classification algorithm supervised A method for classifying data involves receiving a set of training data from a physical process such as a computer network (20). The training data has attribute data and target data. The target data has a class label associated with the attribute data. Dummy ... | 06/14/2005 |
| 6901363 | Method of denoising signal mixtures Disclosed is a method of denoising signal mixtures so as to extract a signal of interest, the method comprising receiving a pair of signal mixtures, constructing a time-frequency representation of each mixture, constructing a pair of histograms, one for signal-of-in... | 05/31/2005 |
| 6898566 | Using signal to noise ratio of a speech signal to adjust thresholds for extracting speech parameters for coding the speech signal There are provided speech coding methods and systems for estimating a plurality of speech parameters of a speech signal for coding the speech signal using one of a plurality of speech coding algorithms, the plurality of speech parameters includes pitch information, ... | 05/24/2005 |
| 6882969 | Variable bit rate digital circuit multiplication equipment with tandem passthrough function Digital circuit multiplication equipment (DCME) refers to coding bit rate information included in a pseudo-speech signal. In accordance with the coding bit rate information, the DCME selects either a coded speech signal extracted by a transmission bit rate restorer ... | 04/19/2005 |
| 6874045 | Digital signal processing apparatus and processing method, and digital signal reproduction/reception system A digital signal processor receives 1-bit audio signals acquired by sigma modulation and sent over a predetermined transmission line and makes a changeover between the audio signal and a mute pattern includes an IEEE 1394 interface. The IEEE 1394 interface receives ... | 03/29/2005 |
| 6865531 | Speech processing system for processing a degraded speech signal A speech processing system, such as a speech recognition or speech coding system, is capable for processing a degraded speech input signal. The system includes an input for receiving the degraded speech input signal. Means 420 are used for estimating a condit... | 03/08/2005 |
| 6862558 | Empirical mode decomposition for analyzing acoustical signals The present invention discloses a computer implemented signal analysis method through the Hilbert-Huang Transformation (HHT) for analyzing acoustical signals, which are assumed to be nonlinear and nonstationary. The Empirical Decomposition Method (EMD) and the Hilbe... | 03/01/2005 |
| 6859773 | Method and device for voice recognition in environments with fluctuating noise levels A method of voice recognition in a noise-ridden acoustic signal comprises a phase of digitizing temporal frames of the noise-ridden acoustic signal, a phase of parametrization of speech-containing temporal frames, a shape-recognition phase in which the parameters ar... | 02/22/2005 |
| 6847928 | Speech decoder and speech decoding method A decoding processing portion 11 of a speech decoder 10 is provided with an emphasis processing portion 15 for performing an emphasis process on signals to be processed (excited signals) SPC generated from coded speech signals BS. A counter port... | 01/25/2005 |
| 6842526 | Adaptive noise level estimator A process for determining an estimated value for the noise level n of a background noise superimposed on an acoustic useful signal is characterized in that the estimated value n(x) for a sampled input signal x(k) is defined as a value n1(x) which is determined by me... | 01/11/2005 |
| 6839666 | Spectrally interdependent gain adjustment techniques The spectral shape of a communication signal is preserved by filtering it into a selected number of frequency band signals representing a selected number of the frequency bands. A calculator generates a plurality of initial gain signals having initial gain values fo... | 01/04/2005 |
| 6832188 | System and method of enhancing and coding speech A system and method that enhance and code a digitized speech signal by breaking the digitized speech signal into constituent parts. The method comprises applying at least two speech enhancement processes to produce at least two enhanced digitized speech signals and ... | 12/14/2004 |
| 6829577 | Generating non-stationary additive noise for addition to synthesized speech A method for producing vowel sounds in a waveform generator using non-stationary additive noise (NSAN) can include computing a frequency spectrum for a selected group of pitch pulses in a recorded sample of a spoken vowel; identifying a set of formant values in the ... | 12/07/2004 |
| 6826528 | Weighted frequency-channel background noise suppressor A method for implementing a noise suppressor in a speech recognition system comprises a filter bank for separating source speech data into discrete frequency sub-bands to generate filtered channel energy, and a noise suppressor for weighting the frequency sub-bands ... | 11/30/2004 |
| 6826527 | Concealment of frame erasures and method A decoder for code excited LP encoded frames with both adaptive and fixed codebooks; erased frame concealment uses muted repetitive excitation, threshold-adapted bandwidth expanded repetitive synthesis filter, and jittered repetitive pitch lag. ... | 11/30/2004 |
| 6820054 | Audio signal processing for speech communication A device receives a signal that includes human-interpretable audio information. The device detects sound locally and analyzes it to determine if an intermittent component is present. If the intermittent component is present, the received signal is altered so that th... | 11/16/2004 |
| 6804640 | Signal noise reduction using magnitude-domain spectral subtraction A method and apparatus for generating a noise-reduced feature vector representing human speech are provided. Speech data representing an input speech waveform are first input and filtered. Spectral energies of the filtered speech data are determined, and a noise red... | 10/12/2004 |
| 6801889 | Time-domain noise suppression A process for noise reduction during the transmission of acoustic useful signals includes the following steps of: (a) determining when a speech pause is present; (b) branching the incoming TC signal from the main signal path and utilizing a Fourier transformation to... | 10/05/2004 |
| 6799161 | Variable bit rate speech encoding after gain suppression A speech coding apparatus having a speech input unit for receiving input speech, a speech coding rate selector for selecting an appropriate speech coding rate according to the power of the input speech, a speech analyzer for processing the input speech to estimate a... | 09/28/2004 |
| 6785648 | System and method for performing speech recognition in cyclostationary noise environments A system and method for performing speech recognition in cyclostationary noise environments includes a characterization module that may access original cyclostationary noise from an intended operating environment of a speech recognition device. The characterization ... | 08/31/2004 |
| 6782361 | Method and apparatus for providing background acoustic noise during a discontinued/reduced rate transmission mode of a voice transmission system Natural-quality synthetic noise will replace background acoustic noise during speech gaps and will achieve a better representation of the excitation signal in a noise-synthesis model by classifying the type of acoustic environment noise into one or more of a plurali... | 08/24/2004 |
| 6778955 | System and method for processing low signal-to-noise ratio signals A system and method for use in a real time system and for processing a signal with a low signal-to-noise ratio (SNR). The system comprises a model for modeling an expected signal and a filter that uses the model for filtering the signal. The filter is used for gener... | 08/17/2004 |
| 6778954 | Speech enhancement method A speech enhancement method, including the steps of: (a) segmenting an input speech signal into a plurality of frames and transforming each frame signal into a signal of the frequency domain; (b) computing the signal-to-noise ratio of a current frame, and computing ... | 08/17/2004 |
| 6775654 | Digital audio reproducing apparatus A digital audio reproducing apparatus including a receiver receiving modulated data, a demodulator demodulating the modulated data received by the receiver, an audio decoder decoding, in a unit of a frame, digital audio information contained in the modulated data de... | 08/10/2004 |
| 6768979 | Apparatus and method for noise attenuation in a speech recognition system The noise suppressor utilizes statistical characteristics of the noise signal to attenuate amplitude values of the noisy speech signal that have a probability of containing noise. In one embodiment, the noise suppressor utilizes an attenuation function having a shap... | 07/27/2004 |
| 6766293 | Method for signalling a noise substitution during audio signal coding In a method for signalling a noise substitution when coding an audio signal, the time-domain audio signal is first transformed into the frequency domain to obtain spectral values. The spectral values are subsequently grouped together to form groups of spectral value... | 07/20/2004 |
| 6766292 | Relative noise ratio weighting techniques for adaptive noise cancellation In order to enhance the quality of a communication signal comprising speech signal components due to speech and noise signal components due to noise, a filter divides the communication signal into a plurality of frequency band signals representing the speech signal ... | 07/20/2004 |
| 6757395 | Noise reduction apparatus and method A multi-band spectral subtraction scheme is proposed, comprising a multi-band filter architecture, noise and signal power detection, and gain function for noise reduction. In one embodiment, the gain function for noise reduction consists of a gain scale function and... | 06/29/2004 |
| 6754353 | Non-interference zones generated by acoustic wave cancellation system The present invention discloses an acoustic voice cancellation system for generating a non-interference zone. The acoustic system includes an input transducer for receiving an acoustic input signal from a speaker to a signal processor. The acoustic system further in... | 06/22/2004 |
| 6754622 | Method for network address table maintenance in a data-over-cable system using destination reachibility A method and system for network address maintenance in a data-over-cable system. The method includes determining whether a network device, such as a cable modem, responds to a request in a timely manner. When updating network address tables, such as Address Resoluti... | 06/22/2004 |
| 6754623 | Methods and apparatus for ambient noise removal in speech recognition Methods and apparatus for enhancing the accuracy and efficacy of speech recognition in an environment, such as the interior of an automobile or home, in which there may be significant ambient noise, such as music from loudspeakers within an automobile or programming... | 06/22/2004 |
| 6751588 | Method for performing microphone conversions in a speech recognition system A method for performing microphone conversions in a speech recognition system comprises a speech module that simultaneously captures an identical input signal using both an original microphone and a final microphone. The original microphone is also used to record an... | 06/15/2004 |
| 6750759 | Annunciatory signal generating method and device for generating the annunciatory signal When a dividing ratio data is written in a counter/timer register 530, a counter/timer circuit 534 divides a frequency of an oscillation signal of the oscillator 532 as much as the dividing ratio data. When an output enabling data is written in ... | 06/15/2004 |
| 6751587 | Efficient excitation quantization in noise feedback coding with general noise shaping In a Noise Feedback Coding (NFC) system having a corresponding ZERO-STATE filter structure, the first ZERO-STATE filter structure including multiple filters, a method of producing a ZERO-STATE response error vector. The method includes: (a) transforming the first ZE... | 06/15/2004 |
| 6744885 | ASR talkoff suppressor A system and method provide ASR talkoff suppression in a prompt-and collect voice transaction system in which a prompt signal is sent and an input signal is received. A comparison is made of a characteristic of the prompt signal and the input signal. Processing of t... | 06/01/2004 |
| 6735561 | Effective deployment of temporal noise shaping (TNS) filters In the MPEG2 Advanced Audio Coder (AAC) standard, Temporal Noise Shaping (TNS) is currently implemented by defining one filter for a given frequency band, and then switching to another filter for the adjacent frequency band when the signal structure in the adjacent ... | 05/11/2004 |
| 6732075 | Sound synthesizing apparatus and method, telephone apparatus, and program service medium In a sound synthesizer, a noise adder generates a noise signal having a frequency band of 3,400 to 4,600 Hz, adjusts the gain of the noise signal, and adds the gain-adjusted noise signal to an excitation source after being filled with zeros by a zero-filling circuit... | 05/04/2004 |
