EP 2347411 A1 20110727 - PRE-ECHO ATTENUATION IN A DIGITAL AUDIO SIGNAL
Title (en)
PRE-ECHO ATTENUATION IN A DIGITAL AUDIO SIGNAL
Title (de)
VOR-ECHO-DÄMPFUNG IN EINEM DIGITALAUDIOSIGNAL
Title (fr)
ATTENUATION DE PRE-ECHOS DANS UN SIGNAL AUDIONUMERIQUE
Publication
Application
Priority
- FR 2009051724 W 20090915
- FR 0856248 A 20080917
Abstract (en)
[origin: WO2010031951A1] The invention relates to a method for attenuating pre-echoes in a digital audio signal generated from a transform encoding, wherein the method comprises, upon decoding and for a current frame of said digital audio signal, a step of defining (CONC) a concatenated signal from at least the reconstructed signal of the current frame, a step of dividing (DIV, 301) said concatenated signal into subunits of samples having a predetermined length, a step of calculating (ENV, 302) the time envelope of the concatenated signal, a step of detecting (DETECT, 304) the transition of the time envelope towards a high-energy area, a step of determining (DTECT, 304) the low-energy sub-units preceding a subunit in which a transition has been detected, and an attenuation step (ATT) in said determined subunits. The method is such that the attenuation is carried out according to an attenuation factor calculated for each of the determined subunits, based on the time envelope of the concatenated signal. The invention also relates to a device for implementing said method, and to a decoder including such a device.
IPC 8 full level
G10L 19/14 (2006.01); G10L 19/02 (2006.01); G10L 19/26 (2013.01); G10L 19/025 (2013.01)
CPC (source: EP US)
G10L 19/26 (2013.01 - EP US); G10L 19/0212 (2013.01 - EP US); G10L 19/025 (2013.01 - EP US)
Citation (search report)
See references of WO 2010031951A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated extension state (EPC)
AL BA RS
DOCDB simple family (publication)
WO 2010031951 A1 20100325; CN 102160114 A 20110817; CN 102160114 B 20120829; EP 2347411 A1 20110727; EP 2347411 B1 20121205; ES 2400987 T3 20130416; JP 2012503214 A 20120202; JP 5295372 B2 20130918; KR 101655913 B1 20160908; KR 20110076936 A 20110706; RU 2011115003 A 20121027; RU 2481650 C2 20130510; US 2011178617 A1 20110721; US 8676365 B2 20140318
DOCDB simple family (application)
FR 2009051724 W 20090915; CN 200980136327 A 20090915; EP 09747881 A 20090915; ES 09747881 T 20090915; JP 2011527373 A 20090915; KR 20117008793 A 20090915; RU 2011115003 A 20090915; US 200913063002 A 20090915