公开(公告)号：EP1495548B1

公开(公告)日：2006-02-22

申请号：EP03747407.9

申请日：2003-04-07

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

发明人： HOMM, Daniel ,  SPERSCHNEIDER, Ralph

IPC分类号： H03M13/03 ,  H03M13/41 ,  G10L19/00 ,  G06F17/00 ,  G06T9/00

CPC分类号： G10L19/005 ,  H03M13/03 ,  H03M13/41 ,  H03M13/6516 ,  H04N19/60 ,  H04N19/69 ,  H04N19/895 ,  H04N19/91

摘要： A device for masking a fault in a faulty or potentially faulty information unit generates output values of a forward decoder (14) and of a backward decoder (16), which differ from one another thereby indicating (18) a fault masking area. The different values for one and the same information unit are checked with regard to a predetermined criterion in order to select (22) the value that fulfills, i.e. is plausible for, the predetermined criterion. This enables, without impairing a compression rate, an elimination or reduction of the continuation faults introduced during a decoding of blocks comprised of reversible code words of a variable length.

公开(公告)号：EP1155498B1

公开(公告)日：2004-03-10

申请号：EP00912430.6

申请日：2000-01-17

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

发明人： SPERSCHNEIDER, Ralph ,  DIETZ, Martin ,  HOMM, Daniel ,  BÖHM, Reinhold

IPC分类号： H03M7/40

CPC分类号： H03M7/40

摘要： The invention relates to an entropy encoder (10) for generating a data flow, which has two reference points consisting of variable-length code words. Said device comprises a first unit (16) for writing at least one portion of a code word into the data flow in a first direction of writing, starting from a first reference point, and comprises a second device (18) for writing at least one portion of a code word into the data flow in a second direction of writing which is opposite to the first directions of writing, starting from the other reference point. In particular, if a raster with multiple segments is used to write the variable-length code words into the data flow, then in the best-case scenario the number of code words that can be written, beginning at the raster points, is doubled in such a way that the data flow of variable-length code words is resistant with regard to the propagation of sequence errors.

公开(公告)号：EP1145227B1

公开(公告)日：2002-07-24

申请号：EP00926896.2

申请日：2000-04-12

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

发明人： LAUBER, Pierre ,  DIETZ, Martin ,  HERRE, Jürgen ,  BÖHM, Reinhold ,  SPERSCHNEIDER, Ralph ,  HOMM, Daniel

IPC分类号： G10L19/00

CPC分类号： G10L19/005

摘要： A method for error concealment in an encoded audio signal, whereby a set of spectral coefficients are divided into at least two sub-bands(14), whereupon said sub-bands undergo reverse transformation (16). A specific prediction is performed (18) for each quasi- time signal of a sub-band in order to obtain an estimated temporal representation for a sub-band of a set of spectral coefficients following on from a real set. Forward transformation (20) of the time signal of each sub-band provides estimated spectral coefficients that can be used (28) instead of defective spectral coefficients of a subsequent set of spectral coefficients in order to conceal transmission errors, for example. Sub-band transformation provides independence from transformation characteristics such as frame length, window type or MDCT algorithm, while at the same time ensuring that spectral processing is maintained for error concealment, whereby the spectral characteristics of audio signals can also be taken into account during said error concealment.