Patents
Sitemap › G10 - Musical instruments; Acoustics › G10L - Speech analysis or synthesis; Speech recognition; Speech or voice processing; Speech or audio coding or decoding › G10L 19 - Speech or audio signal analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
Patents for G10L 19 - Speech or audio signal analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis (31,960)
11/1991
11/26/1991US5068899 Transmission of wideband speech signals
11/26/1991CA2043133A1 Digital signal encoding device
11/21/1991EP0457391A1 Encoding method and encoding system comprising a subband coder, and a transmitter comprising an encoding system
11/21/1991EP0457390A1 Encoding system comprising a subband coder, and a transmitter comprising an encoding system
11/21/1991EP0457161A2 Speech encoding apparatus and related decoding apparatus
11/21/1991EP0456742A1 Speech processing machine
11/19/1991US5067158 Linear predictive residual representation via non-iterative spectral reconstruction
11/13/1991EP0455738A1 Low bit rate transform coder, decoder and encoder/decoder for high-quality audio.
11/05/1991CA1291824C Adpcm encoding and decoding circuits
10/1991
10/31/1991WO1991016769A1 Adaptive-block-length, adaptive-transform, and adaptive-window transform coder, decoder, and encoder/decoder for high-quality audio
10/30/1991EP0454552A2 Method and apparatus for low bitrate speech coding
10/30/1991CN1055830A Adaptive-block-lenght, adaptive-transform, and adaptive-window transform coder, decoder, and encoder/decoder for high-quality audio
10/28/1991WO1991017541A1 Method and device for low-speed speech coding
10/28/1991CA2079884A1 Method and device for low-speed speech coding
10/23/1991EP0453282A2 Digital subband encoding apparatus
10/22/1991US5060269 Hybrid switched multi-pulse/stochastic speech coding technique
10/22/1991US5060268 Speech coding system and method
10/15/1991US5058165 Speech excitation source coder with coded amplitudes multiplied by factors dependent on pulse position
10/09/1991EP0450533A2 Speech synthesis by segmentation on linear formant transition region
10/09/1991EP0450367A2 Speech analysis method and apparatus
10/09/1991EP0450064A1 Digital speech coder having improved sub-sample resolution long-term predictor
10/08/1991US5056143 Speech processing system
10/02/1991EP0449043A2 Method and apparatus for speech digitizing
10/01/1991US5054073 Voice analysis and synthesis dependent upon a silence decision
10/01/1991US5054072 Coding of acoustic waveforms
10/01/1991US5053983 Filter system having an adaptive control for updating filter samples
09/1991
09/25/1991EP0447495A1 Low time-delay transform coder, decoder, and encoder/decoder for high-quality audio.
09/18/1991EP0446917A2 Circuit for controlling tap gains at rapid speed in an adaptive filter
09/18/1991EP0446817A2 Method for reducing the search complexity in analysis-by-synthesis coding
09/11/1991EP0446037A2 Hybrid perceptual audio coding
09/11/1991EP0371032A4 Protection of energy information in sub-band coding
09/10/1991US5048088 Linear predictive speech analysis-synthesis apparatus
09/05/1991WO1991013432A1 Dynamic codebook for efficient speech coding based on algebraic codes
09/04/1991EP0444993A1 Quantifying device with a variable digital coding flow
08/1991
08/28/1991EP0443548A2 Speech coder
08/22/1991WO1991013515A1 Video telephone system
08/22/1991CA2076364A1 Video telephone system
08/21/1991EP0290581B1 Process for transmitting digital audio-signals
08/20/1991US5042069 Methods and apparatus for reconstructing non-quantized adaptively transformed voice signals
08/13/1991US5040217 Perceptual coding of audio signals
08/07/1991EP0440335A2 Encoding speech
08/06/1991US5038377 ROM circuit for reducing sound data
07/1991
07/10/1991EP0436397A2 Sound synthesizer
07/03/1991EP0237561A4 Audio and video digital recording and playback system
07/03/1991CA2031965A1 Sound synthesizer
06/1991
06/25/1991US5027405 Communication system capable of improving a speech quality by a pair of pulse producing units
06/25/1991US5027404 Pattern matching vocoder
06/23/1991CA2025307A1 Fading bit error protection for digital cellular multi-pulse speech coder
06/19/1991EP0433015A2 Variable bit rate coding system
06/18/1991CA1285071C Voice coding process and device for implementing said process
06/12/1991EP0431608A1 A reflective binary encoder for vector quantization
06/12/1991CA2031801A1 Variable bit rate coding system
06/11/1991US5023910 Vector quantization in a harmonic speech coding arrangement
06/04/1991US5021971 Reflective binary encoder for vector quantization
05/1991
05/29/1991EP0235180B1 Voice synthesis utilizing multi-level filter excitation
05/22/1991EP0428445A1 Method and apparatus for coding of predictive filters in very low bitrate vocoders
05/22/1991EP0428156A2 Adaptive transform coding by selecting optimum block lengths according to variations between successive blocks
05/21/1991US5018200 Communication system capable of improving a speech quality by classifying speech signals
05/21/1991US5018199 Code-conversion method and apparatus for analyzing and synthesizing human speech
05/16/1991WO1991006945A1 Speech compression system
05/16/1991WO1991006944A1 Speech waveform compression technique
05/14/1991US5016279 Speech analyzing and synthesizing apparatus using reduced number of codes
05/14/1991US5016278 Method and device for coding the energy of a vocal signal in vocoders with very low throughput rates
05/02/1991WO1991006093A1 Digital speech decoder having a postfilter with reduced spectral distortion
05/01/1991CN1051101A Digital speech decoder having a postfilter with diminished time variant spectral tilt
05/01/1991CN1051100A Lpc based speech synthesis with adaptive pitch prefilter
05/01/1991CN1051099A Digital speech coder having optimized signal energy parameters
04/1991
04/30/1991US5012518 Low-bit-rate speech coder using LPC data reduction processing
04/30/1991US5012517 Adaptive transform coder having long term predictor
04/24/1991EP0424161A2 System for coding and decoding an orthogonally transformed audio signal
04/24/1991EP0424121A2 Speech coding system
04/24/1991EP0424016A2 Perceptual coding of audio signals
04/24/1991EP0423800A2 Speech recognition system
04/24/1991EP0166592B1 Encoding method
04/23/1991US5010574 Vector quantizer search arrangement
04/18/1991WO1991006943A2 Digital speech coder having optimized signal energy parameters
04/18/1991WO1991006091A1 Lpc based speech synthesis with adaptive pitch prefilter
04/18/1991WO1991005333A1 Error detection/correction scheme for vocoders
04/18/1991CA2066568A1 Lpc based speech synthesis with adaptive pitch prefilter
04/17/1991EP0423050A1 Compression apparatus for transformed digital audio signal with adaptive quantization based on psycho-acoustic criterium
04/17/1991EP0422232A1 Voice encoder
04/14/1991WO1991006092A1 Sound synthesizer
04/14/1991CA2066610A1 Sound synthesizer
04/10/1991EP0421360A2 Speech analysis-synthesis method and apparatus therefor
04/10/1991CN1050633A Digital speech coder having improved long-term predictor
04/09/1991US5007095 System for synthesizing speech having fluctuation
04/09/1991US5007094 Multipulse excited pole-zero filtering approach for noise reduction
04/09/1991US5007092 Method and apparatus for dynamically adapting a vector-quantizing coder codebook
03/1991
03/27/1991EP0418958A2 Method and device for converting an analog input signal into control codes and for synthesizing a corresponding output signal under the control of those control codes
03/26/1991US5003604 Voice coding apparatus
03/20/1991EP0417739A2 Speech coding apparatus using multimode coding
03/20/1991CN1050116A Digital transmission system using subband coding of digital signal
03/19/1991US5001759 Method and apparatus for speech coding
03/19/1991US5001758 Voice coding process and device for implementing said process
03/13/1991EP0416036A1 Improved adaptive transform coding
03/06/1991EP0415675A2 Constrained-stochastic-excitation coding
03/06/1991EP0415163A2 Digital speech coder having improved long term lag parameter determination
03/06/1991EP0414838A1 Process for transmitting a signal.
03/02/1991WO1991003790A1 Digital speech coder having improved sub-sample resolution long-term predictor
02/1991
02/20/1991EP0413391A2 Speech coding system and a method of encoding speech
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