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1. WO2010003491 - AUDIO ENCODER AND DECODER FOR ENCODING AND DECODING FRAMES OF SAMPLED AUDIO SIGNAL

Publication Number WO/2010/003491
Publication Date 14.01.2010
International Application No. PCT/EP2009/004015
International Filing Date 04.06.2009
IPC
G06F 17/14 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
17Digital computing or data processing equipment or methods, specially adapted for specific functions
10Complex mathematical operations
14Fourier, Walsh or analogous domain transformations
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 19/0212
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
0212using orthogonal transformation
G10L 19/08
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
G10L 19/20
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
20using sound class specific coding, hybrid encoders or object based coding
Applicants
  • FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. [DE]/[DE] (AllExceptUS)
  • VOICEAGE CORPORATION [CA]/[CA] (AllExceptUS)
  • GEIGER, Ralf [DE]/[DE] (UsOnly)
  • GRILL, Bernhard [DE]/[DE] (UsOnly)
  • BESSETTE, Bruno [CA]/[CA] (UsOnly)
  • GOURNAY, Philippe [FR]/[CA] (UsOnly)
  • FUCHS, Guillaume [FR]/[DE] (UsOnly)
  • MULTRUS, Markus [DE]/[DE] (UsOnly)
  • NEUENDORF, Max [DE]/[DE] (UsOnly)
  • SCHULLER, Gerald [DE]/[DE] (UsOnly)
Inventors
  • GEIGER, Ralf
  • GRILL, Bernhard
  • BESSETTE, Bruno
  • GOURNAY, Philippe
  • FUCHS, Guillaume
  • MULTRUS, Markus
  • NEUENDORF, Max
  • SCHULLER, Gerald
Agents
  • SCHOPPE, Fritz
Priority Data
08017661.308.10.2008EP
61/079,86211.07.2008US
61/103,82508.10.2008US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AUDIO ENCODER AND DECODER FOR ENCODING AND DECODING FRAMES OF SAMPLED AUDIO SIGNAL
(FR) ENCODEUR ET DÉCODEUR AUDIO D’ENCODAGE ET DE DÉCODAGE DE TRAMES DE SIGNAL AUDIO ÉCHANTILLONNÉ
Abstract
(EN)
An audio encoder (10) adapted for encoding frames of a sampled audio signal to obtain encoded frames, wherein a frame comprises a number of time domain audio samples. The audio encoder (10) comprises a predictive coding analysis stage (12) for determining information on coefficients of a synthesis filter and a prediction domain frame based on a frame of audio samples. The audio encoder (10) further comprises a time-aliasing introducing transformer (14) for transforming overlapping prediction domain frames to the frequency domain to obtain prediction domain frame spectra, wherein the time-aliasing introducing transformer (14) is adapted for transforming the overlapping prediction domain frames in a critically-sampled way. Moreover, the audio encoder (10) comprises a redundancy reducing encoder (16) for encoding the prediction domain frame spectra to obtain the encoded frames based on the coefficients and the encoded prediction domain frame spectra.
(FR)
L'invention concerne un encodeur audio (10) conçu pour encoder les trames d'un signal audio échantillonné pour obtenir des trames encodées, une trame comprenant un certain nombre d'échantillons audio de domaine temporel. L'encodeur audio (10) comprend un étage d'analyse de codage prédictif (12) pour déterminer des informations concernant les coefficients d'un filtre de synthèse et une trame de domaine de prédiction sur la base d'une trame d'échantillons audio. L'encodeur audio (10) comprend en outre un transformateur introduisant un repliement temporel (14) pour transformer les trames de domaine de prédiction superposées dans le domaine fréquentiel pour obtenir des spectres de trames de domaine de prédiction, le transformateur introduisant un repliement temporel (14) étant conçu pour transformer les trames de domaine de prédiction superposées d'une manière échantillonnée de façon critique. De plus, l'encodeur audio (10) comprend un encodeur à réduction de redondance (16) pour encoder les spectres de trames de domaine de prédiction pour obtenir les trames encodées sur la base des coefficients et des spectres de trames de domaine de prédiction encodés.
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