EP 2022046 A1 20090211 - CONVERSION BETWEEN SUBBAND FIELD REPRESENTATIONS FOR TIME-DEPENDENT FILTER BANKS
Title (en)
CONVERSION BETWEEN SUBBAND FIELD REPRESENTATIONS FOR TIME-DEPENDENT FILTER BANKS
Title (de)
UMWANDLUNG ZWISCHEN SUBBANDFELDDARSTELLUNGEN FÜR ZEITABHÄNGIGE FILTERBANKEN
Title (fr)
CONVERSION ENTRE REPRESENTATIONS EN DOMAINES DE SOUS-BANDES POUR DES BANCS DE FILTRES VARIANT DANS LE TEMPS
Publication
Application
Priority
- FR 2007051266 W 20070514
- FR 0604507 A 20060519
Abstract (en)
[origin: WO2007135319A1] Conversion between sub-band field representations for time-dependent filter banks. The invention relates to a transcoding processing operation between different sub-band fields, aiming to compact the application of a first vector representing the signal in a first sub-band field to a synthesis filter bank, and then to an analysis filter bank, in order to obtain a second vector representing the signal in a second sub-band field. In particular, the synthesis bank and /or the analysis bank are time-dependent. Within the scope of the invention, matrix filtering of the first vector is anticipated in order to directly obtain the second vector, this matrix filtering being represented by a global conversion matrix comprising pre-calculated sub-blocks of matrices (A<SUB>i0</SUB>, , A<SUB>ip2-1</SUB>) taking into consideration possible time-dependent variations in the filter banks, then stored into memory. The global conversion matrix is then constructed by calls to the memory in order to obtain the sub-blocks at pre-calculated successive instants.
IPC 8 full level
G10L 19/02 (2006.01); G10L 19/14 (2006.01); G10L 19/16 (2013.01)
CPC (source: EP US)
G10L 19/0208 (2013.01 - EP US); G10L 19/173 (2013.01 - EP US)
Citation (search report)
See references of WO 2007135319A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
FR 2901433 A1 20071123; EP 2022046 A1 20090211; US 2009307294 A1 20091210; WO 2007135319 A1 20071129
DOCDB simple family (application)
FR 0604507 A 20060519; EP 07766042 A 20070514; FR 2007051266 W 20070514; US 22724107 A 20070514