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1. WO1996005592 - METHOD AND APPARATUS FOR SELECTING AN ENCODING RATE IN A VARIABLE RATE VOCODER

Publication Number WO/1996/005592
Publication Date 22.02.1996
International Application No. PCT/US1995/009830
International Filing Date 01.08.1995
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 19/14 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
14Details not provided for in groups G10L19/06-G10L19/1287
CPC
G10L 19/0204
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
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 19/10
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
10the excitation function being a multipulse excitation
G10L 19/22
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
16Vocoder architecture
18Vocoders using multiple modes
22Mode decision, i.e. based on audio signal content versus external parameters
G10L 19/24
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
16Vocoder architecture
18Vocoders using multiple modes
24Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
G10L 25/78
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
25Speech or voice analysis techniques not restricted to a single one of groups G10L15/00-G10L21/00
78Detection of presence or absence of voice signals
Applicants
  • QUALCOMM INCORPORATED [US/US]; 6455 Lusk Boulevard San Diego, CA 92121, US
Inventors
  • DEJACO, Andrew, P.; US
  • GARDNER, William, R.; US
Agents
  • MILLER, Russell, B.; Qualcomm Incorporated 6455 Lusk Boulevard San Diego, CA 92121, US
Priority Data
288,41310.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR SELECTING AN ENCODING RATE IN A VARIABLE RATE VOCODER
(FR) PROCEDE ET APPAREIL DE SELECTION D'UN TAUX DE CODAGE DANS UN VOCODEUR A TAUX VARIABLE
Abstract
(EN)
The present invention provides a method by which to reduce the probality of coding low energy unvoiced speech as background noise. An encoding rate is determined by dividing the input signal into subbands using digital subband filters (4) and (6) and comparing the energy in those bands to a set of thresholds in subband rate decision elements (12) and (14) and then examining those comparisons in an encoding rate selector (16). By this method, unvoiced speech can be distinguished from background noise. The present invention, also, provides a means for setting the threshold levels using the signal to noise ratio of the input signal, and the present invention provides a method for coding music through a variable rate vocoder by examining the periodicity of the input signal to distinguish the music from background noise.
(FR)
Procédé qui permet de réduire la probabilité de coder des sons non vocaux à faible énergie en tant que bruit de fond. Un taux de codage est déterminé par la division du signal d'entrée en sous-bandes à l'aide de filtres (4, 6) de sous-bandes numériques et par la comparaison de l'énergie de ces bandes à une série de seuils dans des éléments (12, 14) de décision de taux de sous-bande, puis par l'examen de ces comparaisons dans un sélectionneur (16) de taux de codage. Ce procédé permet de distinguer les sons non vocaux du bruit de fond. La présente invention concerne également un moyen de fixer les niveaux de seuil à l'aide du rapport signal/bruit du signal d'entrée, ainsi qu'un procédé de codage de musique par un vocodeur à taux variable constituant à examiner la périodicité du signal d'entrée pour distinguer la musique du bruit de fond.
Also published as
FI20050702
FI20050703
FI20050704
FI20061084
FI961112
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