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| Number | Title | Issue Date |
| 8078455 | Apparatus, method, and medium for distinguishing vocal sound from other sounds An apparatus, method, and medium for distinguishing a vocal sound. The apparatus includes: a framing unit dividing an input signal into frames, each frame having a predetermined length; a pitch extracting unit determining whether each frame is a voiced frame or an u... | 12/13/2011 |
| 8050911 | Method and apparatus for transmitting speech activity in distributed voice recognition systems A system, method, apparatus, signal-bearing medium, and means for transmitting speech activity in a distributed voice recognition (VR) system. The distributed voice recognition system includes a local VR engine in a subscriber unit (102) and a server VR engin... | 11/01/2011 |
| 8015000 | Classification-based frame loss concealment for audio signals An audio decoding system performs frame loss concealment (FLC) when portions of a bit stream representing an audio signal are lost within the context of a digital communication system. The audio decoding system employs two different FLC methods: one designed to perf... | 09/06/2011 |
| 7996215 | Method and apparatus for voice activity detection, and encoder A method and an apparatus for Voice Activity Detection (VAD) and an encoder are provided. The method for VAD includes: acquiring a fluctuant feature value of a background noise when an input signal is the background noise, in which the fluctuant feature value is use... | 08/09/2011 |
| 7941313 | System and method for transmitting speech activity information ahead of speech features in a distributed voice recognition system A system and method for transmitting speech activity in a distributed voice recognition system. The distributed voice recognition system includes a local VR engine in a subscriber unit and a server VR engine on a server. The local VR engine comprises a feature extra... | 05/10/2011 |
| 7835905 | Apparatus and method for detecting degree of voicing of speech signal In order to detect a degree of voicing of a speech signal, an input speech signal is converted to a speech signal in the frequency domain, a pitch value is calculated from the speech signal, a plurality of harmonic peaks existing in the speech signal are detected, a... | 11/16/2010 |
| 7809555 | Speech signal classification system and method Provided is a speech signal classification system and method. The speech signal classification system includes a primary recognition unit for determining using characteristics extracted from a speech frame whether the speech frame is a voice sound, a non-voice sound... | 10/05/2010 |
| 7809554 | Apparatus, method and medium for detecting voiced sound and unvoiced sound An apparatus, method, and medium for detecting a voiced sound and an unvoiced sound. The apparatus includes a blocking unit for dividing an input signal into block units; a parameter calculator for calculating a first parameter to determine the voiced sound and a se... | 10/05/2010 |
| 7792669 | Voicing estimation method and apparatus for speech recognition by using local spectral information A method and apparatus of estimating a voicing for speech recognition by using local spectral information. The voicing estimation method for speech recognition includes performing a Fourier transform on input voice signals after performing pre-processing on the inpu... | 09/07/2010 |
| 7778825 | Method and apparatus for extracting voiced/unvoiced classification information using harmonic component of voice signal An apparatus and method for extracting precise voiced/unvoiced classification information from a voice signal is provided. The apparatus extracts voiced/unvoiced classification information by analyzing a ratio of a harmonic component to a non-harmonic (or residual) ... | 08/17/2010 |
| 7657427 | Methods and devices for source controlled variable bit-rate wideband speech coding Speech signal classification and encoding systems and methods are disclosed herein. The signal classification is done in three steps each of them discriminating a specific signal class. First, a voice activity detector (VAD) discriminates between active and inactive... | 02/02/2010 |
| 7596488 | System and method for real-time jitter control and packet-loss concealment in an audio signal An “adaptive audio playback controller” operates by decoding and reading received packets of an audio signal into a signal buffer. Samples of the decoded audio signal are then played out of the signal buffer according to the needs of a player device. Jitter cont... | 09/29/2009 |
| 7596487 | Method of detecting voice activity in a signal, and a voice signal coder including a device for implementing the method A method of detecting voice activity in a signal smoothes the “voice” or “noise” decision to avoid loss of speech segments. The method is particularly suitable for situations in which the noise level is high. Unlike the prior art method which favors optimizi... | 09/29/2009 |
| 7590524 | Method of filtering speech signals to enhance quality of speech and apparatus thereof The present invention relates to enhancing a quality of speech wherein speech quality degradation is reduced by removing noise from an unvoiced speech. The present invention comprises dividing an input speech into a voiced speech and an unvoiced speech, performing a... | 09/15/2009 |
| 7577565 | Adaptive voice playout in VOP Packetized CELP-encoded speech playout with frame truncation during silence and frame expansion method dependent upon voicing classification with voiced frame expansion maintaining phasealignment. ... | 08/18/2009 |
| 7424427 | Systems and methods for classifying audio into broad phoneme classes An audio classification system classifies sounds in an audio stream as belonging to one of a relatively small number of classes. The audio classification system includes a signal analysis component [301] and a decoder [302]. The decoder [302] in... | 09/09/2008 |
| 7412379 | Time-scale modification of signals Techniques utilising Time Scale Modification (TSM) of signals are described. The signal is analysed and divided into frames of similar signal types. Techniques specific to the signal type are then applied to the frames thereby optimising the modification process. Th... | 08/12/2008 |
| 7386444 | Hybrid speech coding and system Hybrid linear predictive speech coding system with phase alignment predictive quantization zero phase alignment of speech prior to waveform coding aligns synthesized speech frames of a waveform coder with frames synthesized with a parametric coder. Inter-frame inter... | 06/10/2008 |
| 7376557 | Method and apparatus of overlapping and summing speech for an output that disrupts speech A privacy apparatus adds a privacy sound based on a speaker's own voice into the environment, thereby confusing listeners as to which of the sounds is the real source. This permits disruption of the ability to understand the source speech of the user by eliminating ... | 05/20/2008 |
| 7369991 | Speech recognition system, speech recognition method, speech synthesis system, speech synthesis method, and program product having increased accuracy The object of the present invention is to keep a high success rate in recognition with a low-volume of sound signal, without being affected by noise. The speech recognition system comprises a sound signal processor 10 configured to acquire a sound sign... | 05/06/2008 |
| 7366658 | Noise pre-processor for enhanced variable rate speech codec An enhanced noise pre-processor in a speech codec smoothes channel energy estimate moving toward a first smoothing constant if a prior signal to noise ratio estimate for more than five channels are above a threshold and toward a second smaller smoothing constant oth... | 04/29/2008 |
| 7366661 | Information extracting device The present invention relates to an information extraction apparatus capable of analyzing an acoustic signal with accuracy and high efficiency. An amplitude analysis section 32 determines whether or not an attack or release is contained on the basis of... | 04/29/2008 |
| 7363217 | Method for analyzing energy consistency to process data A method for analyzing energy consistency to process data, for use with an electronic apparatus, includes the steps of analyzing energy consistency to process data, performing a data-buffering process for outputting a data frame, performing a data-processing process... | 04/22/2008 |
| 7363231 | Coding device, decoding device, and methods thereof A coding device capable of improving the coding efficiency and a decoding device for decoding a code sequence generated by the coding device are provided. In the coding device, for each of the possible block combinations obtained when dividing a frame, a coding unit... | 04/22/2008 |
| 7353168 | Method and apparatus to eliminate discontinuities in adaptively filtered signals A method to eliminate discontinuities in an adaptively filtered signal includes filtering a beginning portion of a current signal frame using a past set of filter coefficients, thereby producing a first filtered frame portion. The method also includes filtering the ... | 04/01/2008 |
| 7343284 | Method and system for speech processing for enhancement and detection A method for discriminating noise from signal in a noise-contaminated signal involves decomposing a frame of samples of the signal into decorrelated components, and using a difference between probability distributions of the noise contributions and the signal contri... | 03/11/2008 |
| 7337115 | Systems and methods for providing acoustic classification A speech recognition system receives an audio signal and detects various features of the audio signal. For example, the system classifies the audio signal into speech and non-speech portions, genders of speakers corresponding to the speech portions, and channel band... | 02/26/2008 |
| 7337108 | System and method for providing high-quality stretching and compression of a digital audio signal An adaptive “temporal audio scaler” is provided for automatically stretching and compressing frames of audio signals received across a packet-based network. Prior to stretching or compressing segments of a current frame, the temporal audio scaler first computes ... | 02/26/2008 |
| 7337107 | Perceptual harmonic cepstral coefficients as the front-end for speech recognition Pitch estimation and classification into voiced, unvoiced and transitional speech were performed by a spectro-temporal auto-correlation technique. A peak picking formula was then employed. A weighting function was then applied to the power spectrum. The harmonics we... | 02/26/2008 |
| 7333929 | Modular scalable compressed audio data stream Methods and apparatus are provided for the creation and utilization of unique compressed data stream compositions, structures and formats which allow for the alteration of the data stream's data rate without first decoding the data stream back to its uncompressed fo... | 02/19/2008 |
| 7325023 | Method of making a window type decision based on MDCT data in audio encoding Preliminary Modified Discrete Cosine Transform (MDCT) coefficients are computed for a current frame of data and a next frame of data using a long window type. The computed preliminary MDCT coefficients of the current and next frames are then used to determine the wi... | 01/29/2008 |
| 7324783 | Method, arrangement and communication receiver for SNIR estimation A method, arrangement (512) and communication receiver (500) for SNIR estimation of a received signal, by: deriving (512A) an estimation {circumflex over (Z)} of SNIR of the received signal in accordance with the relation ... | 01/29/2008 |
| 7318028 | Method and apparatus for determining an estimate For determining an estimate of a need for information units for encoding a signal, a measure for the distribution of the energy in the frequency band is taken into account in addition to the admissible interference for a frequency band and an energy of the frequency... | 01/08/2008 |
| 7318032 | Speaker recognition method based on structured speaker modeling and a “Pickmax” scoring technique A technique for improved score calculation and normalization in a framework of recognition with phonetically structured speaker models. The technique involves determining, for each frame and each level of phonetic detail of a target speaker model, a non-interpolated... | 01/08/2008 |
| 7315815 | LPC-harmonic vocoder with superframe structure An enhanced low-bit rate parametric voice coder that groups a number of frames from an underlying frame-based vocoder, such as MELP, into a superframe structure. Parameters are extracted from the group of underlying frames and quantized into the superframe which all... | 01/01/2008 |
| 7305337 | Method and apparatus for speech coding and decoding The present invention includes a method for speech encoding and decoding and a design of speech coder and decoder. The characteristic of speech encoding method relies on the type of data with high compression rate after the whole speech data is compressed. The prese... | 12/04/2007 |
| 7295968 | Device and method for processing an audio signal The invention concerns audio signal processing, comprising: a first processing of an audio source signal, using at least a mathematical transform applied on first sequences of samples obtained by applying first segmentation windows on the audio source signal; and a ... | 11/13/2007 |
| 7295974 | Encoding in speech compression Linear predictive system with classification of LP residual Fourier coefficients into two or more overlapping classes, and each class has its own vector quantization codebook(s). The use of strong and weak predictors minimizes codebook size by only quantizing the di... | 11/13/2007 |
| 7295982 | System and method for automatic verification of the understandability of speech The present invention relates to a system and method for automatically verifying that a message received from a user is intelligible. In an exemplary embodiment, a message is received from the user. A speech level of the user's message may be measured and compared t... | 11/13/2007 |
| 7289951 | Method for improving the coding efficiency of an audio signal The invention relates to a method for improving the coding accuracy and transmission efficiency of an audio signal. According to the method, a part of the audio signal to be coded is compared with earlier stored samples of the audio signal and a reference sequence o... | 10/30/2007 |
