公开(公告)号：EP2524371B1

公开(公告)日：2016-12-07

申请号：EP11700132.1

申请日：2011-01-11

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： FUCHS, Guillaume ,  MULTRUS, Markus ,  RETTELBACH, Nikolaus ,  SUBBARAMAN, Vignesh ,  WEISS, Oliver ,  GAYER, Marc ,  WARMBOLD, Patrick ,  GRIEBEL, Christian

IPC分类号： G10L19/00 ,  G10L19/002 ,  G10L19/02

CPC分类号： G10L19/02 ,  G10L19/0017 ,  G10L19/002

摘要： An audio decoder includes an arithmetic decoder for providing a plurality of decoded spectral values on the basis of an arithmetically encoded representation of the spectral values, and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using the decoded spectral values. The arithmetic decoder selects a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state described by a numeric current context value. The arithmetic decoder determines the numeric current context value in dependence on a plurality of previously decoded spectral values. The arithmetic decoder evaluates a hash table, entries of which define both significant state values and boundaries of intervals of numeric context values, in order to select the mapping rule. A mapping rule index value is individually associated to a numeric context value being a significant state value.

公开(公告)号：EP2524371A1

公开(公告)日：2012-11-21

申请号：EP11700132.1

申请日：2011-01-11

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： FUCHS, Guillaume ,  MULTRUS, Markus ,  RETTELBACH, Nikolaus ,  SUBBARAMAN, Vignesh ,  WEISS, Oliver ,  GAYER, Marc ,  WARMBOLD, Patrick ,  GRIEBEL, Christian

IPC分类号： G10L19/00

CPC分类号： G10L19/02 ,  G10L19/0017 ,  G10L19/002

摘要： An audio decoder includes an arithmetic decoder for providing a plurality of decoded spectral values on the basis of an arithmetically encoded representation of the spectral values, and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using the decoded spectral values. The arithmetic decoder selects a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state described by a numeric current context value. The arithmetic decoder determines the numeric current context value in dependence on a plurality of previously decoded spectral values. The arithmetic decoder evaluates a hash table, entries of which define both significant state values and boundaries of intervals of numeric context values, in order to select the mapping rule. A mapping rule index value is individually associated to a numeric context value being a significant state value.

公开(公告)号：EP2449554A1

公开(公告)日：2012-05-09

申请号：EP10725483.1

申请日：2010-06-24

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： NAGEL, Frederik ,  MULTRUS, Markus ,  DISCH, Sascha ,  LECOMTE, Jeremie ,  ERTEL, Christian ,  WARMBOLD, Patrick

IPC分类号： G10L19/02 ,  G10L19/14 ,  G10L21/02 ,  G10L21/04

CPC分类号： G10L21/038 ,  G10L19/0208 ,  G10L19/022 ,  G10L19/20 ,  G10L19/24 ,  G10L21/04

摘要： A bandwidth extension encoder for encoding an audio signal comprises a signal analyzer, a core encoder and a parameter calculator. The audio signal comprises a low frequency signal comprising a core frequency band and a high frequency signal comprising an upper frequency band. The signal analyzer is configured for analyzing the audio signal, the audio signal having a block of audio samples, the block having a specified length in time. The signal analyzer is furthermore configured for determining from a plurality of analysis windows an analysis window to be used for performing a bandwidth extension in a bandwidth extension decoder. The core encoder is configured for encoding the low frequency signal to obtain an encoded or frequency signal. The parameter calculator is configured for calculating bandwidth extension parameters from the high frequency signal.

公开(公告)号：EP4398246A3

公开(公告)日：2024-07-31

申请号：EP24167819.2

申请日：2011-07-07

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： LECOMTE, Jérémie ,  WARMBOLD, Patrick ,  BAYER, Stefan

IPC分类号： G10L19/00 ,  G10L19/02 ,  G10L19/04

CPC分类号： G10L19/005 ,  G10L19/0212 ,  G10L19/20 ,  G10L19/04

摘要： A codec supporting switching between time-domain aliasing cancellation transform coding mode and time-domain coding mode is made less liable to frame loss by adding a further syntax portion to the frames, depending on which the parser of the decoder may select between a first action of expecting the current frame to comprise, and thus reading forward aliasing cancellation data from the current frame and a second action of not-expecting the current frame to comprise, and thus not reading forward aliasing cancellation data from the current frame. In other words, while a bit of coding efficiency is lost due to the provision of the new syntax portion, it is merely the new syntax portion which provides for the ability to use the codec in case of a communication channel with frame loss. Without the new syntax portion, the decoder would not be capable of decoding any data stream portion after a loss and will crash in trying to resume parsing. Thus, in an error prone environment, the coding efficiency is prevented from vanishing by the introduction of the new syntax portion.

公开(公告)号：EP4398246A2

公开(公告)日：2024-07-10

申请号：EP24167819.2

申请日：2011-07-07

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： LECOMTE, Jérémie ,  WARMBOLD, Patrick ,  BAYER, Stefan

IPC分类号： G10L19/02

CPC分类号： G10L19/005 ,  G10L19/0212 ,  G10L19/20 ,  G10L19/04

摘要： A codec supporting switching between time-domain aliasing cancellation transform coding mode and time-domain coding mode is made less liable to frame loss by adding a further syntax portion to the frames, depending on which the parser of the decoder may select between a first action of expecting the current frame to comprise, and thus reading forward aliasing cancellation data from the current frame and a second action of not-expecting the current frame to comprise, and thus not reading forward aliasing cancellation data from the current frame. In other words, while a bit of coding efficiency is lost due to the provision of the new syntax portion, it is merely the new syntax portion which provides for the ability to use the codec in case of a communication channel with frame loss. Without the new syntax portion, the decoder would not be capable of decoding any data stream portion after a loss and will crash in trying to resume parsing. Thus, in an error prone environment, the coding efficiency is prevented from vanishing by the introduction of the new syntax portion.

公开(公告)号：EP2591470B1

公开(公告)日：2018-12-05

申请号：EP11730006.1

申请日：2011-07-07

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： LECOMTE, Jérèmie ,  WARMBOLD, Patrick ,  BAYER, Stefan

IPC分类号： G10L19/00 ,  G10L19/02 ,  G10L19/04

CPC分类号： G10L19/04 ,  G10L19/005 ,  G10L19/0212 ,  G10L19/20

摘要： A codec supporting switching between time-domain aliasing cancellation transform coding mode and time-domain coding mode is made less liable to frame loss by adding a further syntax portion to the frames, depending on which the parser of the decoder may select between a first action of expecting the current frame to have, and thus reading forward aliasing cancellation data from the current frame and a second action of not-expecting the current frame to have, and thus not reading forward aliasing cancellation data from the current frame. In other words, while a bit of coding efficiency is lost due to the provision of the new syntax portion, it is merely the new syntax portion which provides for the ability to use the codec in case of a communication channel with frame loss. Without the new syntax portion, the decoder would not be capable of decoding any data stream portion after a loss and will crash in trying to resume parsing. Thus, in an error prone environment, the coding efficiency is prevented from vanishing by the introduction of the new syntax portion.

公开(公告)号：EP2524372B1

公开(公告)日：2015-01-14

申请号：EP11700402.8

申请日：2011-01-11

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： FUCHS, Guillaume ,  MULTRUS, Markus ,  RETTELBACH, Nikolaus ,  SUBBARAMAN, Vignesh ,  WEISS, Oliver ,  GAYER, Marc ,  WARMBOLD, Patrick ,  GRIEBEL, Christian

IPC分类号： G10L19/00 ,  G10L19/02

CPC分类号： G10L19/02 ,  G10L19/0017 ,  G10L19/002

摘要： An audio decoder includes an arithmetic decoder for providing a plurality of decoded spectral values on the basis of an arithmetically encoded representation of the spectral values, and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using the decoded spectral values. The arithmetic decoder selects a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state described by a numeric current context value. The arithmetic decoder determines the numeric current context value in dependence on a plurality of previously decoded spectral values. The arithmetic decoder evaluates a hash table, entries of which define both significant state values and boundaries of intervals of numeric context values, in order to select the mapping rule. A mapping rule index value is individually associated to a numeric context value being a significant state value.

公开(公告)号：EP2591470A1

公开(公告)日：2013-05-15

申请号：EP11730006.1

申请日：2011-07-07

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： LECOMTE, Jérèmie ,  WARMBOLD, Patrick ,  BAYER, Stefan

IPC分类号： G10L19/00 ,  G10L19/02 ,  G10L19/04

CPC分类号： G10L19/04 ,  G10L19/005 ,  G10L19/0212 ,  G10L19/20

摘要： A codec supporting switching between time-domain aliasing cancellation transform coding mode and time-domain coding mode is made less liable to frame loss by adding a further syntax portion to the frames, depending on which the parser of the decoder may select between a first action of expecting the current frame to have, and thus reading forward aliasing cancellation data from the current frame and a second action of not-expecting the current frame to have, and thus not reading forward aliasing cancellation data from the current frame. In other words, while a bit of coding efficiency is lost due to the provision of the new syntax portion, it is merely the new syntax portion which provides for the ability to use the codec in case of a communication channel with frame loss. Without the new syntax portion, the decoder would not be capable of decoding any data stream portion after a loss and will crash in trying to resume parsing. Thus, in an error prone environment, the coding efficiency is prevented from vanishing by the introduction of the new syntax portion.

公开(公告)号：EP2517200A1

公开(公告)日：2012-10-31

申请号：EP11700401.0

申请日：2011-01-11

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： FUCHS, Guillaume ,  MULTRUS, Markus ,  RETTELBACH, Nikolaus ,  SUBBARAMAN, Vignesh ,  WEISS, Oliver ,  GAYER, Marc ,  WARMBOLD, Patrick ,  GRIEBEL, Christian

IPC分类号： G10L19/00

CPC分类号： G10L19/02 ,  G10L19/0017 ,  G10L19/002

摘要： An audio decoder includes an arithmetic decoder for providing a plurality of decoded spectral values on the basis of an arithmetically encoded representation of the spectral values, and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using the decoded spectral values. The arithmetic decoder selects a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state described by a numeric current context value. The arithmetic decoder determines the numeric current context value in dependence on a plurality of previously decoded spectral values. The arithmetic decoder evaluates a hash table, entries of which define both significant state values and boundaries of intervals of numeric context values, in order to select the mapping rule. A mapping rule index value is individually associated to a numeric context value being a significant state value.

公开(公告)号：EP4398247A3

公开(公告)日：2024-07-31

申请号：EP24167820.0

申请日：2011-07-07

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： LECOMTE, Jérémie ,  WARMBOLD, Patrick ,  BAYER, Stefan

IPC分类号： G10L19/00 ,  G10L19/02 ,  G10L19/04

CPC分类号： G10L19/005 ,  G10L19/0212 ,  G10L19/20 ,  G10L19/04

摘要： A codec supporting switching between time-domain aliasing cancellation transform coding mode and time-domain coding mode is made less liable to frame loss by adding a further syntax portion to the frames, depending on which the parser of the decoder may select between a first action of expecting the current frame to comprise, and thus reading forward aliasing cancellation data from the current frame and a second action of not-expecting the current frame to comprise, and thus not reading forward aliasing cancellation data from the current frame. In other words, while a bit of coding efficiency is lost due to the provision of the new syntax portion, it is merely the new syntax portion which provides for the ability to use the codec in case of a communication channel with frame loss. Without the new syntax portion, the decoder would not be capable of decoding any data stream portion after a loss and will crash in trying to resume parsing. Thus, in an error prone environment, the coding efficiency is prevented from vanishing by the introduction of the new syntax portion.