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1. WO2008014853 - DEVICE AND METHOD FOR PROCESSING A REAL SUBBAND SIGNAL FOR REDUCING ALIASING EFFECTS

Publication Number WO/2008/014853
Publication Date 07.02.2008
International Application No. PCT/EP2007/005659
International Filing Date 26.06.2007
Chapter 2 Demand Filed 02.06.2008
IPC
G10L 19/02 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
02using spectral analysis, e.g. transform vocoders or subband vocoders
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
H03G 3/00
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
GCONTROL OF AMPLIFICATION
3Gain control in amplifiers or frequency changers ; without distortion of the input signal
H03H 17/0266
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
17Networks using digital techniques
02Frequency selective networks
0248Filters characterised by a particular frequency response or filtering method
0264Filter sets with mutual related characteristics
0266Filter banks
H03H 2218/04
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
2218Indexing scheme relating to details of digital filters
04In-phase and quadrature [I/Q] signals
Applicants
  • FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. [DE]/[DE] (AllExceptUS)
  • EDLER, Bernd [DE]/[DE] (UsOnly)
  • POPP, Harald [DE]/[DE] (UsOnly)
Inventors
  • EDLER, Bernd
  • POPP, Harald
Agents
  • ZINKLER, Franz
Priority Data
10 2006 035 613.631.07.2006DE
10 2006 047 197.005.10.2006DE
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DEVICE AND METHOD FOR PROCESSING A REAL SUBBAND SIGNAL FOR REDUCING ALIASING EFFECTS
(FR) DISPOSITIF ET PROCÉDÉ DE TRAITEMENT D'UN SIGNAL DE SOUS-BANDE RÉEL POUR RÉDUIRE LES EFFETS DE REPLIEMENT
Abstract
(EN)
In order to process a subband signal of a plurality of real subband signals which are a representation of a real discrete-time signal generated by an analysis filter bank, a weighter (10) for weighting a subband signal by a weighting factor determined for the subband signal is provided to obtain a weighted subband signal (11). In addition, a correction term is calculated by a correction term determiner (12), the correction term determiner being implemented to calculate the correction term using at least one other subband signal and using another weighting factor provided for the other subband signal, the two weighting factors differing. The correction term is then combined with the weighted subband signal to obtain a corrected subband signal, resulting in reduced aliasing, even if subband signals are weighted to a different extent.
(FR)
Afin de traiter un signal de sous-bande d'une pluralité de signaux de sous-bande réels qui sont une représentation d'un signal temporel discret réel créé par une banque de filtres d'analyse, on utilise un pondérateur (10) destiné à pondérer un signal de sous-bande selon un facteur de pondération déterminé pour le signal de sous-bande, ceci de manière à obtenir un signal de sous-bande pondéré (11). En outre, un terme de correction est calculé par un dispositif de détermination de terme de correction (12), le dispositif de détermination de terme de correction étant mis en oeuvre pour calculer le terme de correction par utilistion d'au moins un autre signal de sous-bande et d'un autre facteur de pondération donné pour l'autre signal de sous-bande, les deux facteurs de pondération étant différents l'un de l'autre. Le terme de correction est ensuite combiné au signal de sous-bande pondéré pour obtenir un signal de sous-bande corrigé, ce qui se traduit par une réduction du repliement, même si les signaux de sous-bande sont pondérés à un degré différent.
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