EP 1230827 A2 20020814 - METHOD AND DEVICE FOR PROCESSING A STEREO AUDIO SIGNAL
Title (en)
METHOD AND DEVICE FOR PROCESSING A STEREO AUDIO SIGNAL
Title (de)
VERFAHREN UND VORRICHTUNG ZUM VERARBEITEN EINES STEREOAUDIOSIGNALS
Title (fr)
PROCEDE ET DISPOSITIF POUR TRAITER UN SIGNAL AUDIO STEREO
Publication
Application
Priority
- DE 19959156 A 19991208
- EP 0012352 W 20001207
Abstract (en)
[origin: WO0143503A2] The invention relates to a device for processing a stereo audio signal comprising a first channel (L) and a second channel (R). The stereo signal is analysed (12) for obtaining a measure for a bit quantity, whereby said quantity is required by a coder for coding the stereo audio signal using a coding algorithm. The first and the second channel are subsequently modified (14) when the measure for the bit quantity is greater than a predetermined value. Modification is carried out in such a way that the energy of a sum signal of the first and second modified channel (L', R') bears a predetermined ratio in relation to the energy of a sum signal of the first and second channel and that a difference signal of the first and second modified channel is muffled in relation to the difference signal of the first and second channel. The side channel is muffled, especially for audio coders that require a constant output bit rate, when the coding of stereo audio signals cannot observe the output bit rate of the coder. Stereo channel separation is thus abandoned in favour of an increased audio bandwidth or a reduction of quantisation interference.
IPC 1-7
IPC 8 full level
H04H 20/88 (2008.01); G10L 19/008 (2013.01); H03M 7/30 (2006.01); H04S 1/00 (2006.01)
CPC (source: EP US)
G10L 19/008 (2013.01 - EP US); H04S 1/00 (2013.01 - EP US)
Citation (search report)
See references of WO 0143503A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0143503 A2 20010614; WO 0143503 A3 20020510; AT E251376 T1 20031015; DE 19959156 A1 20010628; DE 19959156 C2 20020131; DE 50003945 D1 20031106; EP 1230827 A2 20020814; EP 1230827 B1 20031001; JP 2003516555 A 20030513; JP 2007316658 A 20071206; JP 4000261 B2 20071031; JP 4579273 B2 20101110; US 2003091194 A1 20030515; US 7260225 B2 20070821
DOCDB simple family (application)
EP 0012352 W 20001207; AT 00985148 T 20001207; DE 19959156 A 19991208; DE 50003945 T 20001207; EP 00985148 A 20001207; JP 2001543072 A 20001207; JP 2007165445 A 20070622; US 14924802 A 20020815