EP 1692686 A1 20060823 - AUDIO SIGNAL CODING
Title (en)
AUDIO SIGNAL CODING
Title (de)
AUDIOSIGNAL-CODIERUNG
Title (fr)
CODAGE DE SIGNAL AUDIO
Publication
Application
Priority
- IB 2004052602 W 20041130
- EP 03104535 A 20031204
- EP 04799284 A 20041130
Abstract (en)
[origin: WO2005055203A1] One aspect of the invention provides a decoder for MPEG-1 layer III data signals. In the preferred embodiment, the decoder performs a single inverse MDCT on all 576 frequency lines of a respective granule for type 0, 1 and 3 MP3 window functions, and performs three inverse MDCTs on three sets of 192 frequency lines for type 2 window functions. It is found that the use of "long" inverse MDCTs provides an adequate approximation of a hybrid filterbank which comprises a plurality of "short" inverse MDCTs and a synthesis filterbank. As a result, an output signal may be constructed without the need for a filterbank. Another aspect of the invention provides an encoder for generating MPEG-1 layer III type data signals in which "long" MDCTs are used to replace the hybrid filterbank. As a result, MPEG-1 layer III type data signals may be generated without the need for a filterbank.
IPC 8 full level
G06F 17/14 (2006.01); G06T 9/00 (2006.01); G10L 19/02 (2013.01); H04B 1/66 (2006.01)
CPC (source: EP KR)
G06F 17/147 (2013.01 - EP); G10L 19/02 (2013.01 - KR); G10L 19/0212 (2013.01 - EP); G10L 19/022 (2013.01 - KR); H03M 7/30 (2013.01 - KR); G10L 19/0204 (2013.01 - EP)
Citation (search report)
See references of WO 2005055203A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005055203 A1 20050616; CN 1890712 A 20070103; EP 1692686 A1 20060823; JP 2007515672 A 20070614; KR 20060131767 A 20061220
DOCDB simple family (application)
IB 2004052602 W 20041130; CN 200480035931 A 20041130; EP 04799284 A 20041130; JP 2006542091 A 20041130; KR 20067010745 A 20060601