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1. (WO2014207362) IMPROVED FREQUENCY BAND EXTENSION IN AN AUDIO SIGNAL DECODER
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2014/207362 International Application No.: PCT/FR2014/051563
Publication Date: 31.12.2014 International Filing Date: 24.06.2014
IPC:
G10L 21/038 (2013.01) ,G10L 19/06 (2013.01) ,G10L 19/08 (2013.01)
G PHYSICS
10
MUSICAL INSTRUMENTS; ACOUSTICS
L
SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
21
Processing 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
02
Speech enhancement, e.g. noise reduction or echo cancellation
038
using band spreading techniques
G PHYSICS
10
MUSICAL INSTRUMENTS; ACOUSTICS
L
SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
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
04
using predictive techniques
06
Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
G PHYSICS
10
MUSICAL INSTRUMENTS; ACOUSTICS
L
SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
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
04
using predictive techniques
08
Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
Applicants:
ORANGE [FR/FR]; 78 rue Olivier de Serres F-75015 Paris, FR
Inventors:
KANIEWSKA, Magdalena; FR
RAGOT, Stéphane; FR
Agent:
FROGER Marie-Hélène; ORANGE/IMT/OLPS/IPL/PATENTS 38-40 rue du Général Leclerc F-92794 Issy Moulineaux Cedex 9, FR
Priority Data:
1356100 25.06.2013FR
Title (EN) IMPROVED FREQUENCY BAND EXTENSION IN AN AUDIO SIGNAL DECODER
(FR) EXTENSION AMÉLIORÉE DE BANDE DE FRÉQUENCE DANS UN DÉCODEUR DE SIGNAUX AUDIOFRÉQUENCES
Abstract:
(EN) The invention relates to a method for extending the frequency band of an audio signal during a decoding or improvement process comprising a step of decoding or extracting, in a first so-called low frequency band, an excitation signal and coefficients of a linear prediction filter. The method comprises the following steps: - obtaining a signal (UHB2(k), E403)) extended in at least a second frequency band higher than the first frequency band from an oversampled excitation signal extended in at least a second frequency band (UHB1(k), E401);- scaling (E406) the extended signal by means of a gain defined by subframe on the basis of an energy ratio of a frame and of a subframe; - filtering (E404) said scaled extended signal with a linear prediction filter of which the coefficients are derived from the coefficients of the low frequency band filter. The invention also relates to a frequency band extension device implementing the described method and a decoder comprising such a device.
(FR) L'invention se rapporte à un procédé d'extension de bande de fréquence d'un signal audiofréquence lors d'un processus de décodage ou d'amélioration comportant une étape de décodage ou d'extraction, dans une première bande de fréquence dite bande basse, d'un signal d'excitation et des coefficients d'un filtre de prédiction linéaire. Le procédé comporte les étapes suivantes: - obtention d'un signal étendu (UHB2(k), E403)) dans au moins une deuxième bande de fréquence supérieure à la première bande de fréquence à partir d'un signal d'excitation sur-échantillonné et étendu dans au moins une deuxième bande de fréquence (UHB1(k), E401);- mise à l'échelle (E406) du signal étendu par un gain défini par sous-trame en fonction d'un ratio d'énergie d'une trame et d'une sous-trame; - filtrage (E404) dudit signal étendu mis à l'échelle par un filtre de prédiction linéaire dont les coefficients sont dérivés des coefficients du filtre de la bande basse. L'invention se rapporte également à un dispositif d'extension de bande de fréquence mettant en œuvre le procédé décrit et un décodeur comportant un tel dispositif.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: French (FR)
Filing Language: French (FR)