Processing

Please wait...

Settings

Settings

Goto Application

1. WO2002041302 - ENHANCING THE PERFORMANCE OF CODING SYSTEMS THAT USE HIGH FREQUENCY RECONSTRUCTION METHODS

Publication Number WO/2002/041302
Publication Date 23.05.2002
International Application No. PCT/SE2001/002533
International Filing Date 14.11.2001
Chapter 2 Demand Filed 13.06.2002
IPC
G10L 13/00 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
13Speech synthesis; Text to speech systems
G10L 19/18 2013.01
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
16Vocoder architecture
18Vocoders using multiple modes
G10L 21/038 2013.01
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
038using band spreading techniques
H03M 7/30 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING, DECODING OR CODE CONVERSION, IN GENERAL
7Conversion of a code where information is represented by a given sequence or number of digits to a code where the same information is represented by a different sequence or number of digits
30Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
CPC
G10L 19/18
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
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
  • CODING TECHNOLOGIES SWEDEN AB [SE]/[SE] (AE, AG, AL, AM, AT, AU, AZ, BA, BB, BE, BF, BG, BJ, BR, BY, BZ, CA, CF, CG, CH, CI, CM, CN, CO, CR, CU, CY, CZ, DE, DK, DM, DZ, EE, ES, FI, FR, GA, GB, GD, GE, GH, GM, GN, GQ, GR, GW, HR, HU, ID, IE, IL, IN, IS, IT, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MC, MD, MG, MK, ML, MN, MR, MW, MX, MZ, NE, NL, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, SN, SZ, TD, TG, TJ, TM, TR, TT, TZ, UA, UG, UZ, VN, YU, ZA, ZW)
  • HENN, Fredrik [CH]/[SE] (UsOnly)
  • EHRET, Andreas [DE]/[DE] (UsOnly)
  • SCHUG, Michael [DE]/[DE] (UsOnly)
Inventors
  • HENN, Fredrik
  • EHRET, Andreas
  • SCHUG, Michael
Agents
  • ZINKLER, Franz
Priority Data
0004187-115.11.2000SE
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) ENHANCING THE PERFORMANCE OF CODING SYSTEMS THAT USE HIGH FREQUENCY RECONSTRUCTION METHODS
(FR) AMELIORATION DES PERFORMANCES DE SYSTEMES DE CODAGE UTILISANT DES PROCEDES DE RECONSTRUCTION HAUTE FREQUENCE
Abstract
(EN)
The present invention relates to digital audio coding systems that employ high freuqency reconstruction (HFR) methods. It teaches how to improve the overall perforamcne of such systems, by means of an adaptation over time of the crossover frequency between the lowband coded by a core codec, and the highband coded by an HFR system. Different methods of establishing the instantaneous optimum choice of crossover frequency are introduced.
(FR)
La présente invention concerne des systèmes de codage audio numérique qui emploient des procédés de reconstruction haute fréquence (HFR). L'invention permet d'améliorer les performances générales de tels systèmes par une adaptation dans le temps de la fréquence de coupure entre la bande basse codée par un codeur-décodeur à tores, et la bande haute codée par un système HFR. L'invention concerne également différents procédés permettant de faire le choix optimal instantané de la fréquence de coupure.
Latest bibliographic data on file with the International Bureau