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6304842 |
Location and coding of unvoiced plosives in linear predictive coding of speech
A method of encoding signal segments which represent unvoiced plosives. The signal segments to be encoded are contained within a speech signal divided into m=1, . . . , N frames. Each frame is...
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6295520 |
Multi-pulse synthesis simplification in analysis-by-synthesis coders
Speech is synthesized by optimizing frame data containing an excitation signal and impulse response filter coefficients, and convolving the excitation signal and impulse response filter...
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6292777 |
Phase quantization method and apparatus
A phase quantization method and apparatus in which the phase information of the input signal such as at the time of the sinusoidal synthesis encoding can be quantized efficiently. The phase of the...
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6292776 |
Hierarchial subband linear predictive cepstral features for HMM-based speech recognition
A method and apparatus for first training and then recognizing speech. The method and apparatus use subband cepstral features to improve the recognition string accuracy rates for speech inputs.
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6289307 |
Codebook preliminary selection device and method, and storage medium storing codebook preliminary selection program
Prior to deriving precise evaluation values for evaluating errors between synthetic signal vectors and a target signal vector, simple evaluation values are derived. Based on the simple evaluation...
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6289306 |
Data processing of a bitstream signal
A data processing apparatus includes an input terminal for receiving an audio signal, a 1-bit A/D converter for A/D converting the audio signal so as to obtain a bitstream signal, and a prediction...
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6289305 |
Method for analyzing speech involving detecting the formants by division into time frames using linear prediction
A process for speech analysis and more specifically an automatic process for the analysis of continuous speech. The waveshape of the speech is described with the aid of the resonant frequencies,...
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6289313 |
Method, device and system for estimating the condition of a user
An improved method for estimating the status of human physiological and/or psychological conditions by observing the values of the vocal tract parameters output from a digital speech encoder. The...
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6272460 |
Method for implementing a speech verification system for use in a noisy environment
A method for implementing a speech verification system for use in a noisy environment comprises the steps of generating a confidence index for an utterance using a speech verifier, and controlling...
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6272196 |
Encoder using an excitation sequence and a residual excitation sequence
In a CELP coder, a comparison between a target signal and a plurality of synthetic signals is made. A synthetic signal is derived by filtering a plurality of excitation sequences by a synthesis...
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6272459 |
Voice signal coding apparatus
A voice signal coding apparatus includes: a voice status detector detecting whether an input signal divided at predetermined frame intervals is a voice or a non-voice signal; a linear predictive...
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6266632 |
Speech decoding apparatus and speech decoding method using energy of excitation parameter
The speech decoding apparatus decodes a speech signal that is coded into a plurality of speech parameters including an excitation parameter, using the excitation parameter. The controller controls...
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6256609 |
Method and apparatus for speaker recognition using lattice-ladder filters
A method and apparatus for speech analysis and synthesis, including speaker recognition, includes a programmable lattice-ladder notch filter which may be programmed to exhibit both filter poles and...
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6253172 |
Spectral transformation of acoustic signals
An improved method of providing a pitch shifted or frequency transformed signal includes frequency scaling the original signal (12) and generating a desired spectrum envelope of the frequency...
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6249762 |
Method for separation of data into narrowband and broadband time series components
A method for separation of acoustical data into narrowband and broadband time series components includes the steps of: constructing a data matrix in which time series samples of acoustical data are...
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6246979 |
Method for voice signal coding and/or decoding by means of a long term prediction and a multipulse excitation signal
This invention relates to a method for voice signal coding and/or decoding. According to this method, a voice signal analysis for determining the prediction parameters is carried out from a digital...
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6243673 |
Speech coding apparatus and pitch prediction method of input speech signal
The speech coding apparatus comprises a memory to store the convolution data of a pitch reproduced excitation pulse sequence extracted from an excitation pulse sequence in the pitch reproduction...
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6240385 |
Methods and apparatus for efficient quantization of gain parameters in GLPAS speech coders
In methods and apparatus for encoding a gain parameter in a generalized linear predictive analysis-by-synthesis (GLPAS) coder, a subframe gain parameter is determined for each of a plurality of...
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6240382 |
Efficient codebook structure for code excited linear prediction coding
A speech communication system using a code excited linear prediction speech decoder. The decoder using a first codebook containing a first digital value sequence selected from the set of binary...
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6240383 |
Celp speech coding and decoding system for creating comfort noise dependent on the spectral envelope of the speech signal
A speech coding and decoding system consisting of a speech coding system and a speech decoding system, the speech coding system comprises a low pass filter using an LPC parameter, and an efficient...
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6240299 |
Cellular radiotelephone having answering machine/voice memo capability with parameter-based speech compression and decompression
A method for speech encoding and decoding usable in a Digital Telephone Answering Machine/Voice Memo for a cellular radiotelephone is provided. The apparatus uses parameter-based speech compression...
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6236961 |
Speech signal coder
The spectral or pitch parameters of a speech signal are quantized, and impulse responses thereof are predicted by using a filter. An orthogonal transform is made of the speech signal, or a signal...
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6233552 |
Adaptive post-filtering technique based on the Modified Yule-Walker filter
An adaptive time-domain post-filtering technique is based on the modified Yule-Walker filter. This technique eliminates the problem of spectral tilt in speech spectrum that can be applied to...
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6226606 |
Method and apparatus for pitch tracking
In a method for tracking pitch in a speech signal, first and second window vectors are created from samples taken across first and second windows of the speech signal. The first window is separated...
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6223153 |
Variation in playback speed of a stored audio data signal encoded using a history based encoding technique
The invention relates to a voice processing system capable of varying the speed of output of digitized audio data stored therein. The digitized audio data is stored using blocks of LPC...
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6223151 |
Method and apparatus for pre-processing speech signals prior to coding by transform-based speech coders
A method and apparatus which is used to precondition a speech signal such that the signal has relatively low power at predetermined points which form the boundaries of DFT blocks in a coder. The...
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6223157 |
Method for direct recognition of encoded speech data
Digital Cellular telephony requires voice compression designed to minimize the bandwidth required for the digital cellular channel. The features used in speech recognition have similar components...
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6212546 |
Providing a modular gateway architecture which isolates attributes of the client and server systems into independent components
Method and apparatus for a new interface architecture which reduces the number of software components required to interface a variety of requester types coupled to a server with a variety of...
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6208957 |
Voice coding and decoding system
A first CELP coding circuit receiving a signal obtained by down-sampling of an input signal by a down-sampling circuit, outputs a part of coded output to a second CELP coding circuit. The second...
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6208962 |
Signal coding system
For voice and musical signal, a signal coding system which can obtain good sound quality even at a low bit rate is provided. The signal coding system predicts an input signal in a predicting...
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6205423 |
Method for coding speech containing noise-like speech periods and/or having background noise
A method of coding speech under background noise conditions or during noise-like speech periods wherein during active voice speech segments an analysis-by-synthesis method is used. However, when a...
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6202045 |
Speech coding with variable model order linear prediction
A method of coding a sampled speech signal in which the speech signal is divided into sequential frames. For each current frame, a first set of linear prediction coding (LPC) coefficients are...
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6199040 |
System and method for communicating a perceptually encoded speech spectrum signal
System efficiently communicates a perceptually encoded speech spectrum signal from a transmitter to a receiver. The transmitter includes a speech analyzer which accepts a speech signal input and...
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6192334 |
Audio encoding apparatus and audio decoding apparatus for encoding in multiple stages a multi-pulse signal
Auxiliary multi-pulse setting circuit 130 set candidates of pulse positions so that the pulse positions to which no pulse is located are selected in auxiliary multi-pulse searching circuit 131...
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6192335 |
Adaptive combining of multi-mode coding for voiced speech and noise-like signals
In producing from an original speech signal a plurality of parameters from which an approximation of the original speech signal can be reconstructed, a coded signal of the original speech signal is...
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6188884 |
Telephony device comprising a digital processing element for speech signals and method implemented in such a device
A telephony device includes a base station and a wireless handset. The base station has a responder with a memory. A processor of base station processes digital speech signals having a first code...
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6182030 |
Enhanced coding to improve coded communication signals
At a transmitter of a communication system, a target signal and a primary coded signal are produced in response to an input signal. The primary coded signal is intended to match the target signal....
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6182033 |
Modular approach to speech enhancement with an application to speech coding
A speech coder separates input digitized speech into component parts on an interval by interval basis. The component parts include gain components, spectrum components and excitation signal...
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6172965 |
Duplex transmission scheme
This invention relates to duplex and to half duplex transmission schemes and more particularly to the application of such schemes in TDMA and other multiple access environments. In accordance with...
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6173255 |
Synchronized overlap add voice processing using windows and one bit correlators
Apparatus and methods for compressing an audio signal. An analog to digital converter is used to digitize the audio signal. A linear predictor processes the digitized audio signal to attenuate...
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6173256 |
Method and apparatus for audio representation of speech that has been encoded according to the LPC principle, through adding noise to constituent signals therein
Speech is received as a sequence of segments that are coded according to an LPC principle. The segments are reproduced for concatenated read-out in audio reproduction, by exciting an all-pole...
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6169970 |
Generalized analysis-by-synthesis speech coding method and apparatus
A generalized analysis-by-synthesis method and apparatus are disclosed. A plurality of trial original signals are generated based on an original signal for coding. The trial original signals are...
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6167373 |
Linear prediction coefficient analyzing apparatus for the auto-correlation function of a digital speech signal
A sample speech is analyzed by a speech analyzing unit to obtain sample characteristic parameters, and a coding distortion is calculated from the sample characteristic parameters in each of a...
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6167372 |
Signal identifying device, code book changing device, signal identifying method, and code book changing method
A signal identifying device which can identify an input signal easily includes a pitch extracting (4Y) for extracting a pitch component of the input signal (S1), and energy calculating unit (4X)...
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6161089 |
Multi-subframe quantization of spectral parameters
Speech is encoded into a frame of bits. A speech signal is digitized into a sequence of digital speech samples that are then divided into a sequence of subframes. A set of model parameters is...
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6161086 |
Low-complexity speech coding with backward and inverse filtered target matching and a tree structured mutitap adaptive codebook search
A family of low-complexity, high quality CELP speech coders are described which use two new techniques: Backward and Inverse Filtered Target (BIFT) for fixed codebook excitation search; and...
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6157712 |
Speech immunity enhancement in linear prediction based DTMF detector
To determine whether a received signal represents a dual tone multi frequency (DTMF) code, a characteristic of the received signal is repeatedly measured over a period of time, thereby obtaining a...
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6148282 |
Multimodal code-excited linear prediction (CELP) coder and method using peakiness measure
A multimodal code-excited linear prediction (CELP) speech coder determines a pitch-lag-periodicity-independent peakiness measure from the input speech. If the measure is greater than a peakiness...
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6141639 |
Method and apparatus for coding of signals containing speech and background noise
A signal including speech and background noise is encoded by first decomposing the signal into speech and noise components. A first speech encoding algorithm is then used to generate codebook...
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6141637 |
Speech signal encoding and decoding system, speech encoding apparatus, speech decoding apparatus, speech encoding and decoding method, and storage medium storing a program for carrying out the method
A speech encoding and decoding system comprises a speech coding apparatus and a speech decoding apparatus. The speech encoding apparatus orthogonally transforms an input speech signal represented...
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