Processing

Please wait...

Settings

Settings

Goto Application

1. WO2001061687 - WIDEBAND SPEECH CODEC USING DIFFERENT SAMPLING RATES

Publication Number WO/2001/061687
Publication Date 23.08.2001
International Application No. PCT/IB2001/000134
International Filing Date 02.02.2001
Chapter 2 Demand Filed 06.09.2001
IPC
G10L 19/02 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech 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
02using spectral analysis, e.g. transform vocoders or subband vocoders
G10L 19/12 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech 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
04using predictive techniques
08Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
12the excitation function being a code excitation, e.g. in code excited linear prediction vocoders
G10L 21/02 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
21Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
02Speech enhancement, e.g. noise reduction or echo cancellation
CPC
G10L 19/0208
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech or audio signals 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
02using spectral analysis, e.g. transform vocoders or subband vocoders
0204using subband decomposition
0208Subband vocoders
G10L 19/12
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech or audio signals 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
04using predictive techniques
08Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
12the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders
G10L 21/038
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
21Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
02Speech enhancement, e.g. noise reduction or echo cancellation
038using band spreading techniques
Applicants
  • NOKIA CORPORATION [FI]/[FI]
  • NOKIA INC. [US]/[US] (LC)
Inventors
  • ROTOLA-PUKKILA, Jani
  • MIKKOLA, Hannu
  • VAINIO, Janne
Agents
  • MAGUIRE, Francis, J.
Priority Data
09/505,41116.02.2000US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) WIDEBAND SPEECH CODEC USING DIFFERENT SAMPLING RATES
(FR) CODEC DE PAROLE A LARGE BANDE UTILISANT DIFFERENTES FREQUENCES D'ECHANTILLONNAGE
Abstract
(EN)
Wideband (WB) system includes a linear predictive (LP) analysis module (11) responsive to the nth frame of the wideband speech signal, for providing LP analysis filter characteristics; a WB LP analysis filter (12a), also responsive to the nth frame of the WB speech signal, for providing a filtered WB speech input; a band-splitting module (14), responsive to the filtered WB speech input for the nth frame, for splitting the filtered WB speech input into k bands, the band-splitting module for providing a lower band (LB) target signal x(n); an excitation search module (16), responsive to the LB target signal x(n), for providing an LB excitation exc(n); a band-combining module (17), responsive to exc(n), for providing a WB excitation excw(n); and a WB LP synthesis filter (18), responsive to the LP analysis filter characteristics and to excw(n), for providing WB synthesized speech.
(FR)
L'invention concerne un système à large bande (WB) comprenant un module d'analyse (11) à prévision linéaire (LP) sensible à la énième trame du signal de parole à large bande, destiné à fournir des caractéristiques de filtrage de l'analyse à prévision linéaire ; un filtre d'analyse (12a) à prévision linéaire à large bande, également sensible à la énième trame du signal de parole à large bande, destiné à fournir une entrée de parole à large bande filtrée ; un module de fractionnement de bande (14), sensible à l'entrée de parole à large bande filtrée pour la énième trame, destiné à fractionner l'entrée de parole à large bande filtrée en k bandes, ce module étant destiné à fournir un signal cible x(n) à bande inférieure (LB) ; un module de recherche d'excitation (16), sensible au signal cible x(n) à bande inférieure, destiné à fournir une excitation exc(n) à bande inférieure ; un module de combinaison de bande (17), sensible à exc(n), destiné à fournir une excitation excw(n) à large bande ; et un filtre de synthèse (18) à prévision linéaire à large bande, sensible aux caractéristiques de filtrage de l'analyse à prévision linéaire et à excw(n), destiné à fournir une parole synthétisée à large bande.
Also published as
Latest bibliographic data on file with the International Bureau