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| Number | Title | Issue Date |
| 7016488 | Method and apparatus for non-linear processing of an audio signal A communication system having an echo canceller is disclosed. One embodiment of the echo canceller includes an adaptive filter used to provide an estimate of reflected echo which is removed from the send signal. The echo canceller may also include a near-end talker ... | 03/21/2006 |
| 7013271 | Method and system for implementing a low complexity spectrum estimation technique for comfort noise generation A method and system for implementing a low complexity spectrum estimation technique for comfort noise generation are disclosed. Another aspect of the present invention involves segregating filter parameter encoding from an adaptation process for transmission in the ... | 03/14/2006 |
| 7013268 | Method and apparatus for improved weighting filters in a CELP encoder There is provided a speech encoder comprising a first weighting means for performing an error weighting on a speech input. The first weighting means is configured to reduce an error signal resulting from a difference between a first synthesized speech signal and the... | 03/14/2006 |
| 7013266 | Method for determining speech quality by comparison of signal properties In a method for determining speech quality using an objective measure, in order to enhance prediction reliability of the evaluated quality parameters, distortions of the mean spectral envelope are extensively corrected with a weighting function WT(f) befo... | 03/14/2006 |
| 7012901 | Devices, software and methods for generating aggregate comfort noise in teleconferencing over VoIP networks Devices, software and methods are provided for generating aggregate comfort noise for teleconferencing over IP networks. A transcoding component includes a decoder for decoding streams of packets. A summing component has a summer with summing inputs to receive the d... | 03/14/2006 |
| 7012683 | Apparatus and methods for optically inspecting a sample for anomalies Disclosed are methods and apparatus for detecting a relatively wide dynamic range of intensity values from a beam (e.g., scattered light, reflected light, or secondary electrons) originating from a sample, such as a semiconductor wafer. In other words, the inspectio... | 03/14/2006 |
| 7010483 | Speech processing system A speech processing system is provided which is operable to receive sets of signal values representative of a speech signal generated by a speech source. The system is operable to determine a measure of the quality of the speech signal by performing a statistical an... | 03/07/2006 |
| 7010130 | Noise level updating system A noise level of an input signal is detected, and a detected noise level is held in a noise level holding section. The held noise level is updated when a subsequent noise level largely changes. ... | 03/07/2006 |
| 7010129 | Method and device for operating voice-controlled systems in motor vehicles A device for operating voice-controlled systems, such as communication and/or intercommunication systems in motor vehicles, includes a plurality of microphones and at least one loudspeaker. Voice signals received by the microphones are transmitted to the at least on... | 03/07/2006 |
| 7006967 | System and method for automating transcription services A system for substantially automating transcription services for multiple users (10, 11, 12) including a manual transcription station (50), speech recognition program (40) and a routing program (200). A uniquely identified voice dictation... | 02/28/2006 |
| 7003464 | Dialog recognition and control in a voice browser A voice browser dialog enabler for multimodal dialog uses a multimodal markup document with fields have markup-based forms associated with each field and defining fragments. A voice browser driver resides on a communication device and provides the fragments and iden... | 02/21/2006 |
| 7003455 | Method of noise reduction using correction and scaling vectors with partitioning of the acoustic space in the domain of noisy speech A method and apparatus are provided for reducing noise in a training signal and/or test signal. The noise reduction technique uses a stereo signal formed of two channel signals, each channel containing the same pattern signal. One of the channel signals is “cleanâ... | 02/21/2006 |
| 7003452 | Method and device for detecting voice activity The invention concerns a method for detecting voice activity in a digital speech signal, in at least a frequency band, for example by means of a detecting automaton whereof the status is controlled on the basis of an energy analysis of the signal. The control of sai... | 02/21/2006 |
| 7003451 | Apparatus and method applying adaptive spectral whitening in a high-frequency reconstruction coding system The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilizing high frequency reconstruction (HFR). It utilizes adaptive filtering to reduce artifacts due to different tonal characteristics in different frequ... | 02/21/2006 |
| 7003039 | Dictionary generation method for video and image compression This invention relates to the creation of dictionary functions for the encoding of video signals using matching pursuit compression techniques. After an initial set of reference dictionary images is chosen, training video sequences are selected, and motion residuals... | 02/21/2006 |
| 6999924 | System and method for characterizing voiced excitations of speech and acoustic signals, removing acoustic noise from speech, and synthesizing speech The present invention is a system and method for characterizing human (or animate) speech voiced excitation functions and acoustic signals, for removing unwanted acoustic noise which often occurs when a speaker uses a microphone in common environments, and for synth... | 02/14/2006 |
| 6999921 | Audio overhang reduction by silent frame deletion in wireless calls To address the need for reducing audio overhang in wireless communication systems (e.g., 100), the present invention provides for the deletion of silent frames before they are converted to audio by the listening devices. The present invention only provides fo... | 02/14/2006 |
| 6999920 | Exponential echo and noise reduction in silence intervals Method for the reduction of echo and/or noise signals in TK systems for the transmission of useful acoustic signals, in which, when a silence interval is present, the distorted useful signal is modified by a time-dependent control signal ao(t) or by a con... | 02/14/2006 |
| 6999775 | Method of controlling load in mobile communication system by DTX period modification The present invention relates to a method of controlling load in a mobile communication system in a system in which mobile stations include means for utilizing discontinuous transmission. In order to utilize the traffic capacity of the system more efficiently than b... | 02/14/2006 |
| 6996527 | Linear discriminant based sound class similarities with unit value normalization A common requirement in automatic speech recognition is to recognize a set of words for any speaker without training the system for each new speaker. A speech recognition system is provided utilizing linear discriminant based phonetic similarities with inter-phoneti... | 02/07/2006 |
| 6996525 | Selecting one of multiple speech recognizers in a system based on performance predections resulting from experience A method for selecting a speech recognizer from a number of speech recognizers in a speech recognition system. The speech recognition system receives an audio stream from an application and derives enabling information. The speech recognition system then enables at ... | 02/07/2006 |
| 6996068 | Audio testing in a packet switched network An audio test system for analyzing and quantifying audio data losses during network-based telephony sessions between communication devices such as telephony-enabled computers and Internet telephones. A transmit device converts an input audio signal to a stream of da... | 02/07/2006 |
| 6993484 | Speech synthesizing method and apparatus An amplitude altering magnification (r) applied to sub-phoneme units of a voiced portion and an amplitude altering magnification s to be applied to sub-phoneme units of an unvoiced portion are determined based upon a target phoneme average power (p0) of s... | 01/31/2006 |
| 6993481 | Detection of speech activity using feature model adaptation According to the invention, a method for detecting speech activity for a signal is disclosed. In one step, a plurality of features is extracted from the signal. An active speech probability density function (PDF) of the plurality of features is modeled, and an inact... | 01/31/2006 |
| 6993479 | Method for the compression of recordings of ambient noise, method for the detection of program elements therein, and device thereof The amount of data produced in the process of recording even short hearing samples by means of a monitor (1) may be considerably reduced by effecting a normalization to a range of values D and a subsequent nonlinear mapping to a second, preferably smaller ran... | 01/31/2006 |
| 6990446 | Method and apparatus using spectral addition for speaker recognition A method and apparatus for speaker recognition is provided that matches the noise in training data to noise in testing data using spectral addition. Under spectral addition, the mean and variance for a plurality of frequency components are adjusted in the training d... | 01/24/2006 |
| 6990475 | Digital signal processing method, learning method, apparatus thereof and program storage medium Power spectrum data is calculated from a digital audio signal D10. A part of power spectrum data is extracted from thus calculated power spectrum data. Classification is made based on the extracted part of power spectrum data. And the digital audio signal D | 01/24/2006 |
| 6985860 | Model adaptation apparatus, model adaptation method, storage medium, and pattern recognition apparatus To achieve an improvement in recognition performance, a non-speech acoustic model correction unit adapts a non-speech acoustic model representing a non-speech state using input data observed during an interval immediately before a speech recognition interval during ... | 01/10/2006 |
| 6985858 | Method and apparatus for removing noise from feature vectors A method and computer-readable medium are provided for identifying clean signal feature vectors from noisy signal feature vectors. The method is based on variational inference techniques. One aspect of the invention includes using an iterative approach to identify t... | 01/10/2006 |
| 6983245 | Weighted spectral distance calculator A spectral distance calculator includes a calculator for performing spectral distance calculations to compare a spectrum of an an input signal in the presence of a noise signal and a reference spectrum. A memory pre-stores a noise spectrum from the noise signal. A m... | 01/03/2006 |
| 6983242 | Method for robust classification in speech coding A method for robust speech classification in speech coding and, in particular, for robust classification in the presence of background noise is herein provided. A noise-free set of parameters is derived, thereby reducing the adverse effects of background noise on th... | 01/03/2006 |
| 6980950 | Automatic utterance detector with high noise immunity An utterance detector for speech recognition is described. The detector consists of two components. The first part makes a speech/non-speech decision for each incoming speech frame. The decision is based on a frequency-selective autocorrelation function obtained by ... | 12/27/2005 |
| 6980952 | Source normalization training for HMM modeling of speech A maximum likelihood (ML) linear regression (LR) solution to environment normalization is provided where the environment is modeled as a hidden (non-observable) variable. By application of an expectation maximization algorithm and extension of Baum-Welch forward and... | 12/27/2005 |
| 6980956 | Machine apparatus and its driving method, and recorded medium Drive means for performing a behavior based on a behavioral model prescribing a behavior is controlled, and the behavioral model is changed depending on a predetermined stimulus. Therefore, by giving the stimulus, the behavioral model can be freely changed, and a me... | 12/27/2005 |
| 6978001 | Method and system for controlling audio content during multiparty communication sessions A method and system for controlling audio content during a multiparty communication session includes prompting active participants to the multiparty communication session to identify themselves. Media from a particular device from which no active participant is iden... | 12/20/2005 |
| 6970753 | Storage and transmission of one-bit data Apparatus for storing or transmitting a one-bit digital signal comprises an input inverter for inverting a subset of the data bits of an input one-bit digital signal, to generate a bit-inverted signal; a storage or transmission medium for storing or transmitting the... | 11/29/2005 |
| 6963759 | Speech recognition technique based on local interrupt detection In a wireless communication system, local detection of an interrupt indicator during a voice communication between a user of a subscriber unit and another person is provided. Responsive to the interrupt indicator, a portion of a speech recognition element is activat... | 11/08/2005 |
| 6961660 | Method and system for data detection in a global positioning system satellite receiver A data detection circuit within a global positioning system (GPS) satellite receiver operates to detect and decode data sent in a spread spectrum signal. The data detection circuit receives input from a radio receiver, the information containing data from a pluralit... | 11/01/2005 |
| 6961421 | Echo analysis for identification of hybrid induced echo in a communication link Echo return loss is analyzed to determine if the near end connection of a communication link has hybrid induced echo. If the echo return loss is above a threshold value for a predetermined period, than no echo or very little echo is present. The lack of echo is trea... | 11/01/2005 |
| 6959276 | Including the category of environmental noise when processing speech signals A method and apparatus are provided for identifying a noise environment for a frame of an input signal based on at least one feature for that frame. Under one embodiment, the noise environment is identified by determining the probability of each of a set of possible... | 10/25/2005 |
