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6473733 |
Signal enhancement for voice coding
An adaptive noise suppression system includes an input A/D converter, an analyzer, a filter, and a output D/A converter. The analyzer includes both feed-forward and feedback signal paths that allow...
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6470312 |
Speech coding apparatus, speech processing apparatus, and speech processing method
The invention enables a source speech signal to be coded in an optimal way. An adaptive codebook (Ba) stores a series of signal vectors of a past speech signal. A vector extraction means extracts a...
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6460016 |
Audio decoding device for decoding coded audio information with multiple channels
An audio decoding device for decoding audio information with multiple channels includes a coded information memory section for storing the coded audio information; an information transmission...
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6456935 |
Voice guidance intonation in a vehicle navigation system
A method and apparatus are described for providing route guidance to a user of a vehicle navigation system. A route is generated which corresponds to a plurality of maneuvers. Each of the maneuvers...
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6456963 |
Block length decision based on tonality index
A converting portion converts each of blocks of an input digital audio signal into a number of spectral frequency-band components, the blocks being produced from the signal along a time axis. A...
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6453281 |
Portable audio database device with icon-based graphical user-interface
A method and apparatus for storing and retrieving information to and from a memory of a hand-held audio database device. The audio database device includes a graphics display provided on a...
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6452517 |
DSP for two clock cycle codebook search
A device for performing a search for the optimum code vector in a codebook having N code vectors indexed by i has a controller which considers each ith code vector, and a processor which determines...
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6453291 |
Apparatus and method for voice activity detection in a communication system
In order for the Voice Activity Detector (VAD) decision to overcome the problem of being over-sensitive to fluctuating, non-stationary background noise conditions, a bias factor is used to increase...
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6446037 |
Scalable coding method for high quality audio
Scalable coding of audio into a core layer in response to a desired noise spectrum established according to psychoacoustic principles supports coding augmentation data into augmentation layers in...
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6442209 |
Digital radio communication station
The station includes a coded speech signal source having a given digital rate, a modulator for producing a radio signal from the coded speech signal provided by the source, and a redundancy encoder...
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6438236 |
Audio signal identification using digital labelling signals
Apparatus for labelling a stereophonic signal includes a plurality of notch filters having selected center frequencies to form notches at the selected frequencies in the channels of a stereophonic...
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6430529 |
System and method for efficient time-domain aliasing cancellation
The invention comprises an efficient system and method for performing the modified discrete cosine transform (MDCT) in support of time-domain aliasing cancellation (TDAC) perceptive encoding...
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6430528 |
Method and apparatus for demixing of degenerate mixtures
A method and system for blind channel estimation comprises acquiring two mixtures of at least one at least weakly W-disjoint orthogonal source signal, calculating point-by-point ratios of a...
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6424936 |
Block size determination and adaptation method for audio transform coding
A method for identifying and categorizing an audio signal into subclasses to determine a subframe block size of a transform coder. A number of block sizes available for the transform coder is...
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6418440 |
System and method for performing automated dynamic dialogue generation
A customized method or algorithm for holding an interactive dialogue session between a (human) user and a machine (hereinafter referred to simply as a “dialogue”) is generated, such that the...
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6418404 |
System and method for effectively implementing fixed masking thresholds in an audio encoder device
A system and method for effectively implementing fixed masking thresholds in an audio encoder device comprises a filter bank for filtering source audio data to produce frequency sub-bands, a lookup...
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6415251 |
Subband coder or decoder band-limiting the overlap region between a processed subband and an adjacent non-processed one
If all original subbands are not selected for processing in conventional subband coders or decoders aliasing distortion is generated by the characteristics of their subband band-splitting filters...
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6411925 |
Speech processing apparatus and method for noise masking
A speech processing apparatus is provided in which the distribution of energy with frequency within each frame of an input speech signal is determined and any energy components which are less than...
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6393394 |
Method and apparatus for interleaving line spectral information quantization methods in a speech coder
A method and apparatus for interleaving line spectral information quantization methods in a speech coder includes quantizing line spectral information with two vector quantization techniques, the...
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6385571 |
High quality audio encoding/decoding apparatus and digital versatile disc
An input separator separates the whole digital audio signal into a first audio signal belonging to the basic region and a second audio signal belonging to the extended region. A lossless encoder...
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6385572 |
System and method for efficiently implementing a masking function in a psycho-acoustic modeler
A system comprises a refined psycho-acoustic modeler for efficient perceptive encoding compression of digital audio. Perceptive encoding uses experimentally derived knowledge of human hearing to...
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6385570 |
Apparatus and method for detecting transitional part of speech and method of synthesizing transitional parts of speech
An apparatus and method for detecting transitional parts of speech, and a method of synthesizing transitional parts of speech, are provided. This apparatus includes a residual signal preprocessor...
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6370499 |
Method of encoding digital data
Encoding digital data in the present invention enables change of minimum limit of audibility characteristics and/or masking characteristics, which are usually set on the basis of the...
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6370504 |
Speech recognition on MPEG/Audio encoded files
A technique to perform speech recognition directly from audio files compressed using the MPEG/Audio coding standard. The technique works in the compressed domain and does not require the MPEG/Audio...
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6366578 |
Systems and methods for multiple mode voice and data communications using intelligently bridged TDM and packet buses and methods for implementing language capabilities using the same
Systems and methods by which voice/data communications may occur in multiple modes/protocols are disclosed. In particular, systems and methods are provided for multiple native mode/protocol voice...
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6363338 |
Quantization in perceptual audio coders with compensation for synthesis filter noise spreading
Many perceptual split-band coding systems that use analysis and synthesis filters assume the quantization noise introduced by quantizing split-band signals is substantially the same as the noise...
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6358055 |
Method and apparatus for teaching prosodic features of speech
A system and apparatus for teaching prosodic features of speech senses and extracts prosodic or suprasegmental variables of a user's speech segment. Prosodic features of speech include pitch and...
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6339756 |
System for compression and decompression of audio signals for digital transmission
A audio digital CODEC is provided with various parameters that when changed affect the quality of the resultant audio. These psycho-acoustic parameters include the standard ISO parameters and...
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6332119 |
Adjustable CODEC with adjustable parameters
An audio digital CODEC can be connected to a plurality of digital transmission facilities. The CODEC has a plurality of programmable compression schemes which are upgradeable and downloadable. One...
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6330532 |
Method and apparatus for maintaining a target bit rate in a speech coder
A method and apparatus for maintaining a target bit rate in a speech coder includes a speech coder for encoding a frame at a preselected encoding rate, computing a running average bit rate for a...
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6324503 |
Method and apparatus for providing feedback from decoder to encoder to improve performance in a predictive speech coder under frame erasure conditions
A method and apparatus for providing feedback from the decoder to the encoder to improve performance in a predictive speech coder under frame erasure conditions includes notifying an encoder in a...
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6324504 |
System and method for bit interleaving of full-rate speech data
A memory-efficient system and method for generating data blocks "on demand" for TDMA data bursts. In one embodiment of the present invention, a GSM transmitter module converts forward error...
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6308150 |
Dynamic bit allocation apparatus and method for audio coding
Provided is a dynamic bit allocation apparatus and method for audio coding which can be used widely for almost all digital audio compression systems and besides implemented simply with low cost....
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6308154 |
Method of natural language communication using a mark-up language
A method and apparatus are provided for encoding a spoken language. The method includes the steps recognizing a verbal content of the spoken language, measuring an attribute of the recognized...
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6301555 |
Adjustable psycho-acoustic parameters
An audio digital CODEC is provided with various parameters that when changed affect the quality of the resultant audio. These psycho-acoustic parameters include the standard ISO parameters and...
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6298322 |
Encoding and synthesis of tonal audio signals using dominant sinusoids and a vector-quantized residual tonal signal
Tonal audio signals can be modeled as a sum of sinusoids with time-varying frequencies, amplitudes, and phases. An efficient encoder and synthesizer of tonal audio signals is disclosed. The encoder...
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6285982 |
Sound decompressing apparatus providing improved sound quality during special reproducing such as forward search reproducing and reverse search reproducing
A sound decompressing apparatus which achieves special reproducing, also known as trick play, two examples of which are forward search reproducing and reverse search reproducing, by selecting and...
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6275589 |
Method and apparatus for error masking in multi-channel audio signals
For audio coding, the MPEG-2 standard provides for a spatial representation by multi-channel reproduction. In order to ensure backwards compatibility with MPEG-1 signals, the signals of the...
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6266644 |
Audio encoding apparatus and methods
An audio encoding system includes quantization, phase matching, compressed domain processing and other improvements enabling high fidelity, low bit rate encoding systems to be formed. In a...
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6260016 |
Speech synthesis employing prosody templates
Prosody templates, constructed during system design, store intonation (F0) and duration information based on syllabic stress patterns for the target word. The prosody templates are constructed so...
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6256628 |
Data charting
A method of displaying clustered data points in detail and in context within a data set. The method includes the step of identifying one or more clustered sets of data points within a data set. The...
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6243671 |
Device and method for analysis and filtration of sound
A device for analysis and filtration of sound which comprises at least one frequency-linear filter, at least one frequency-logarithmic filter and a weighting means for the combining and non-linear...
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6241612 |
Voice communication during a multi-player game
Real-time synchronized voice communications during a multi-player game is disclosed. A server is connected to client computers, players. Players can speak into a microphone and have their voice...
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6240379 |
System and method for preventing artifacts in an audio data encoder device
A system and method for preventing artifacts in an audio data encoder device comprises a filter bank for filtering source audio data to produce frequency sub-bands, a psycho-acoustic modeler for...
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6240380 |
System and method for partially whitening and quantizing weighting functions of audio signals
The coder/decoder (codec) system of the present invention includes a coder and a decoder. The coder includes a multi-resolution transform processor, such as a modulated lapped transform (MLT)...
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6237047 |
Signal processing system including plurality of processing cards communicating with plurality of independent CPU
A voice processing architecture is disclosed wherein a plurality of voice processing cards are resident on a network but which are not deployed within a resident host computer. The host computers...
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6230141 |
Synchronization of a two-channel audio decoder with a multichannel audio decoder
Dolby AC-3 and MPEG-2 audio permit the transmission of audio signals with more than two independent audio channels. If a reproduction device has only a two-channel audio decoder (DEC1) then an...
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6226608 |
Data framing for adaptive-block-length coding system
An audio encoder applies an adaptive block-encoding process to segments of audio information to generate frames of encoded information that are aligned with a reference signal conveying the...
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6224383 |
Method and system for computer assisted natural language instruction with distracters
A method of computerized language instruction for a student. Based on data regarding past performance of the student, an adjustable speech recognizer is adjusted. An utterance is received from the...
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6219634 |
Efficient watermark method and apparatus for digital signals
Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum...
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