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| Number | Title | Issue Date |
| 7835912 | Signal processing method, processing apparatus and voice decoder The present invention discloses a signal processing method adapted to process a synthesized signal in packet loss concealment. The method includes the following steps: receiving a good frame following a lost frame, obtaining an energy ratio of energy of a signal in ... | 11/16/2010 |
| 7711563 | Method and system for frame erasure concealment for predictive speech coding based on extrapolation of speech waveform A method and system are provided for synthesizing a corrupted frame output from a decoder including one or more predictive filters. The corrupted frame is representative of one segment of a decoded signal output from the decoder. The method comprises extrapolating a... | 05/04/2010 |
| 7707034 | Audio codec post-filter Techniques and tools are described for processing reconstructed audio signals. For example, a reconstructed audio signal is filtered in the time domain using filter coefficients that are calculated, at least in part, in the frequency domain. As another example, prod... | 04/27/2010 |
| 7359409 | Packet loss concealment for voice over packet networks A method to reduce memory requirements for a packet loss concealment algorithm in the event of packet loss in a receiver of pulse code modulated voice signals. Packet losses are concealed by using the spectral analysis filter memory to smooth a signal gap and by usi... | 04/15/2008 |
| 7353177 | System and method of providing conversational visual prosody for talking heads A system and method of controlling the movement of a virtual agent while the agent is listening to a human user during a conversation is disclosed. The method comprises receiving speech data from the user, performing a prosodic analysis of the speech data and contro... | 04/01/2008 |
| 7349852 | System and method of providing conversational visual prosody for talking heads A system and method of controlling the movement of a virtual agent while the agent is listening to a human user during a conversation is disclosed. The method comprises receiving speech data from the user, performing a prosodic analysis of the speech data and contro... | 03/25/2008 |
| 7330813 | Speech processing apparatus and mobile communication terminal A speech processing apparatus able to enhance formants more naturally, wherein a speech analyzing unit analyzes an input speech signal to find LPCs and converts the LPCs to LSPs, a speech decoding unit calculates a distance between adjacent orders of the LSPs by an ... | 02/12/2008 |
| 7328162 | Source coding enhancement using spectral-band replication The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction (101) prior to or in the encoder (103), followed by spectral-band replication (105) at the decoder ... | 02/05/2008 |
| 7308406 | Method and system for a waveform attenuation technique for predictive speech coding based on extrapolation of speech waveform A method and system are provided for processing an extrapolated signal including a number of consecutive replacement frames. The method comprises attenuating a portion of the extrapolated signal when the extrapolated signal reaches a predetermined duration. The atte... | 12/11/2007 |
| 7305339 | Restoration of high-order Mel Frequency Cepstral Coefficients A method for estimating high-order Mel Frequency Cepstral Coefficients, the method comprising initializing any of N−L high-order coefficients (HOC) of an MFCC vector of length N having L low-order coefficients (LOC) to a predetermined value, thereby forming a cand... | 12/04/2007 |
| 7295939 | Hardware implementation of the pseudo-spectral time-domain method A computer hardware configuration for performing the pseudo-spectral time-domain (PSTD) method on data. The hardware configuration includes a forward fast Fourier transform (FFT) unit that calculates a forward fast Fourier transform (FFT) from the data, and a comple... | 11/13/2007 |
| 7283967 | Encoding device decoding device An encoding device (100) includes (i) a first encoding unit (132) that encodes spectral data in the lower frequency band represented by a plularity of parameters, out of the spectral data obtained by transforming an audio signal inputted for a fixed ti... | 10/16/2007 |
| 7283961 | High-quality speech synthesis device and method by classification and prediction processing of synthesized sound There is disclosed a speech processing device in which prediction taps for finding prediction values of the speech of high sound quality are extracted from the synthesized sound obtained on affording linear prediction coefficients and residual signals, generated fro... | 10/16/2007 |
| 7283957 | Multi-channel signal encoding and decoding A multi-channel linear predictive analysis-by-synthesis signal encoding method detects (S26, S27) inter-channel correlation and select one of several possible encoding modes (S24, S29, S30) based on the detected correlation. ... | 10/16/2007 |
| 7283955 | Source coding enhancement using spectral-band replication The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction (101) prior to or in the encoder (103), followed by spectral-band replication (105) at the decoder ... | 10/16/2007 |
| 7280959 | Indexing pulse positions and signs in algebraic codebooks for coding of wideband signals The indexing method comprises forming a set of tracks of pulse positions, restraining the positions of the non-zero-amplitude pulses of the combinations of the codebook in accordance with the set of tracks of pulse positions, and indexing in the codebook each non-ze... | 10/09/2007 |
| 7269559 | Speech decoding apparatus and method using prediction and class taps The present invention relates to a data processing apparatus capable of obtaining high-quality sound, etc. A tap generation section 121 generate a prediction tap from synthesized speech data for 40 samples in a subframe of subject data of interest within the ... | 09/11/2007 |
| 7240005 | Method of controlling high-speed reading in a text-to-speech conversion system A method of high-speed reading in a text-to-speech conversion system including a text analysis module (101) for generating a phoneme and prosody character string from an input text; a prosody generation module (102) for generating a synthesis parameter... | 07/03/2007 |
| 7228272 | Continuous time warping for low bit-rate CELP coding A signal modification technique facilitates compact voice coding by employing a continuous, rather than piece-wise continuous, time warp contour to modify an original residual signal to match an idealized contour, avoiding edge effects caused by prior art techniques... | 06/05/2007 |
| 7200557 | Method of reducing index sizes used to represent spectral content vectors A method identifies a codeword to represent a vector derived from an audio signal by applying the vector to first and second decision trees. The first decision tree is associated with a first type of audio sound and produces a first codeword. The second decision tre... | 04/03/2007 |
| 7191384 | Method and apparatus for transmitting and receiving a block of data in a communication system A method and apparatus for transmitting and receiving data provide for efficient use communication resources by encoding data in accordance with a first code to produce a block of data, determining transmission data rate of a time frame, selecting a portion of the b... | 03/13/2007 |
| 7184958 | Speech synthesis method A speech synthesis method subjects a reference speech signal to windowing to extract a speech pitch wave having a window function of a window length double a pitch period of the reference speech signal from the reference speech signal. A linear prediction coefficien... | 02/27/2007 |
| 7181404 | Method and apparatus for audio compression A method and apparatus for audio compression receives an audio signal. Transform coding is applied to the audio signal to generate a sequence of transform frequency coefficients. The sequence of transform frequency coefficients is partitioned into a plurality of non... | 02/20/2007 |
| 7177804 | Sub-band voice codec with multi-stage codebooks and redundant coding Techniques and tools related to coding and decoding of audio information are described. For example, redundant coded information for decoding a current frame includes signal history information associated with only a portion of a previous frame. As another example, ... | 02/13/2007 |
| 7155386 | Adaptive correlation window for open-loop pitch An approach for adaptively adjusting the correlation window for open-loop pitch determination is presented. Correlation between a windowed reference signal (or target signal) and a candidate signal is maximized under most conditions by sliding the reference window b... | 12/26/2006 |
| 7152032 | Voice enhancement device by separate vocal tract emphasis and source emphasis A voice intensifier capable of reducing abrupt changes in the amplification factor between frames and realizing excellent sound quality with less noise feeling by dividing input voices into the sound source characteristic and the vocal tract characteristic, so as to... | 12/19/2006 |
| 7143029 | Apparatus and method for changing the playback rate of recorded speech An apparatus for changing the playback rate of recorded speech includes memory storing a plurality of recorded speech messages and a plurality of feature tables. Each feature table is associated with an individual one of the speech messages and includes speech frame... | 11/28/2006 |
| 7143038 | Speech synthesis system A speech synthesizing system producing a speech of an improved quality of voice by selecting a combination of speech segment most suitable for a synthesis speech unit sequence. The speech synthesizing system comprises a speech segment storage section where speech se... | 11/28/2006 |
| 7133411 | Apparatus and method to compensate for unsynchronized transmission of synchrous data by counting low energy samples Maintaining a count of the number of samples below a predefined energy level that are in the sample queue. This count is then utilized by a circuit that is removing samples from the sample queue to determine which samples to delete in order to maintain a synchronous... | 11/07/2006 |
| 7130793 | System and method for minimizing overrun and underrun errors in packetized voice transmission When it is determined that a sample queue exceeds a first predefined level, samples being received from a IP switched network are modified such that samples are removed within the voiced region of the samples by removing whole pitch periods of samples. If the sample... | 10/31/2006 |
| 7130799 | Speech synthesis method A speech synthesizing method which synthesizes speech naturally is disclosed. Standardized frame power values of an n-th frame is calculated when frame power values at head and tail frames in a phoneme are standardized. An average value of the power values sampled f... | 10/31/2006 |
| 7123661 | Datastream transmitters for discrete multitone systems A method for transmitting an analog datastream includes coding data input into a data input device. The resulting coded data is assembled into coded data blocks. These blocks are transformed into at least one discrete multitone symbol. An initial filter value extrac... | 10/17/2006 |
| RE39336 | Formant-based speech synthesizer employing demi-syllable concatenation with independent cross fade in the filter parameter and source domains The concatenative speech synthesizer employs demi-syllable subword units to generate speech. The synthesizer is based on a source-filter model that uses source signals that correspond closely to the human glottal source and that uses filter parameters that correspon... | 10/10/2006 |
| 7096180 | Method and apparatuses for improving quality of digitally encoded speech in the presence of interference Methods and apparatuses for encoding speech signals in the presence of interference that accurately establishes a speech signal value subsequent to lost transmission packets. For one embodiment of the present invention, the initial bits of a speech transmission pack... | 08/22/2006 |
| 7085282 | Method and apparatus for providing forward error correction The disclosed embodiments relate to a system for generating forward error correction (FEC) packets. The system includes a first FEC encoder that receives data and encodes first FEC data with the data to form FEC encoded data. Also included in the system is a second ... | 08/01/2006 |
| 7072832 | System for speech encoding having an adaptive encoding arrangement In accordance with one aspect of the invention, a selector supports the selection of a first encoding scheme or the second encoding scheme based upon the detection or absence of the triggering characteristic in the interval of the input speech signal. The first enco... | 07/04/2006 |
| 7072291 | Devices, softwares and methods for redundantly encoding a data stream for network transmission with adjustable redundant-coding delay Devices, softwares and methods are provided for redundantly encoding a data stream into frames for network transmission as packets. A main encoder encodes a data stream into main frames, while a redundant encoder encodes it into redundant frames. The redundant frame... | 07/04/2006 |
| 7058066 | Controlling the transition glitch that occurs when a gateway switches from voice over IP to voice band data In a gateway router the length of the play-out buffer in VBD mode is not set at a previously established value. Instead the length of the play-out buffer in VBD mode is determined by the length of the buffer in the previous audio mode. When the system switches from ... | 06/06/2006 |
| 7050969 | Distributed speech recognition with codec parameters A method extracts speech recognition features from a speech signal coded as a bitstream. First, the bitstream is decoded to recover linear predictive coding filter parameters, and a residual signal. Then, the linear predictive coding filter parameters and the residu... | 05/23/2006 |
| 7035794 | Compressing and using a concatenative speech database in text-to-speech systems A method and apparatus are provided for compressing and using a concatenative speech database in TTS systems to improve the quality of speech output generated by handheld TTS systems by allowing synthesis to occur on the client. According to one embodiment of the pr... | 04/25/2006 |
