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1. 发明公开

EP1451934A2 SIGNAL PROCESSING METHOD, AND CORRESPONDING ENCODING METHOD AND DEVICE 审中-公开
标题翻译：信号处理，以及相关的设备和方法编码
公开(公告)号：EP1451934A2
公开(公告)日：2004-09-01
申请号：EP02781518.2
申请日：2002-11-14
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine , CHABBOUH, Slim
IPC分类号： H03M7/40
CPC分类号： H03M7/40 , G06T9/005
摘要： The invention relates to a method of defining a new set of codewords for use in a variable length coding algorithm, and to a data encoding method using such a code. Said coding method comprises at least the steps of applying to said data a transform and coding the obtained coefficients by means of the variable length coding algorithm. The code used in said algorithm is built with the same length distribution as the binary Huffman code distribution, and is constructed by implementation of specific steps : (a) creating a synchronization tree structure of the codes with decreasing depths for each elementary branch of said tree, with initialized parameters D = lmax, K = nlmax/2, and current l = lcur = lmax, (D and K being integers representing respectively the maximum length of a string of zeros and the maximum length of a string of ones, lmax the greatest codeword length, and nlmax the number of codewords of length lmax in the Huffman code); (b) for each length lcur beginning from lmax, if n'lcur ≠nlcur, using the codeword 1k as prefix and anchor to it the maximal size elementary branch of depth D' = lcur - K; (c) if 1k cannot be used as prefix, find a suitable prefix by choosing the minimal length codeword that is in excess with respect to the desired distribution.

2. 发明公开

EP1397869A1 METHOD OF DECODING A VARIABLE-LENGTH CODEWORD SEQUENCE 有权
标题翻译：方法用于解码可变长度码字的序列
公开(公告)号：EP1397869A1
公开(公告)日：2004-03-17
申请号：EP02730624.0
申请日：2002-05-21
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine , POTHIER, Olivier
IPC分类号： H03M13/41 , H03M13/45 , H03M7/40
CPC分类号： H03M7/40 , H03M13/3944 , H03M13/3955 , H03M13/6318
摘要： The present invention relates to a method of source decoding variable-length codeword sequences, said decoding being based on an associated state diagram comprising a plurality of states (S) and on a code (C). It is characterized in that it comprises a step of reducing the states (S) in the state diagram in such a way that, at a bit time (Bj), only a number N of states in a group (G) of states is saved on the basis of a criterion derived from a partial metric computation and otherwise independently of an alphabet of said code (C), a group (G) being associated with a bit time (Bj). A group (G) corresponds to all the states (S) calculated at each bit time (Bj).

3. 发明公开

EP1611687A1 METHOD AND DEVICE FOR BUILDING A VARIABLE-LENGTH ERROR-CORRECTING CODE 审中-公开
标题翻译：方法和设备为建设一个可变长度编码纠错
公开(公告)号：EP1611687A1
公开(公告)日：2006-01-04
申请号：EP04722917.4
申请日：2004-03-24
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine
IPC分类号： H03M13/03 , H03M7/40
CPC分类号： H03M13/6318 , H03M7/40 , H03M13/036 , H03M13/21
摘要： The invention relates to the construction of variable-length error-correcting (VLEC) code, using the main steps of: defining all the needed parameters, generating a code having a fixed length L1, storing in a set W thus obtained all the possible L1-tuples distant of the minimum diverging distance d'min! from the codewords (one extra-bit being affixed at the end of all words if the new set W thus obtained is not empty), deleting all words of W that do not satisfy a distance criterion with all codewords, and verifying that all words of the final set W satisfy another distance criterion. When the codeword deletion is done not anymore only in the last obtained group of the code, but in the group of a given length value Ls to which the algorithm will skip back to in the codeword deletion operation, the beginning of the best VLEC structure of each Ls is, according to the invention, kept in memory and re-used within the next search.

4. 发明授权

EP1397869B1 METHOD OF DECODING A VARIABLE-LENGTH CODEWORD SEQUENCE 有权
标题翻译：方法用于解码可变长度码字的序列
公开(公告)号：EP1397869B1
公开(公告)日：2006-11-02
申请号：EP02730624.0
申请日：2002-05-21
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine , POTHIER, Olivier
IPC分类号： H03M13/41 , H03M13/45 , H03M7/40
CPC分类号： H03M7/40 , H03M13/3944 , H03M13/3955 , H03M13/6318
摘要： The present invention relates to a method of source decoding variable-length codeword sequences, said decoding being based on an associated state diagram comprising a plurality of states (S) and on a code (C). It is characterized in that it comprises a step of reducing the states (S) in the state diagram in such a way that, at a bit time (Bj), only a number N of states in a group (G) of states is saved on the basis of a criterion derived from a partial metric computation and otherwise independently of an alphabet of said code (C), a group (G) being associated with a bit time (Bj). A group (G) corresponds to all the states (S) calculated at each bit time (Bj).

5. 发明授权

EP1449306B1 METHOD OF DECODING A VARIABLE-LENGTH CODEWORD SEQUENCE 有权
标题翻译：方法用于解码序列码字变量长度
公开(公告)号：EP1449306B1
公开(公告)日：2005-11-16
申请号：EP02781522.4
申请日：2002-11-13
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine , MEILHAC, Lisa
IPC分类号： H03M13/45
CPC分类号： H03M7/40

6. 发明公开

EP1556954A1 METHOD AND DEVICE FOR BUILDING A VARIABLE-LENGTH ERROR CODE 审中-公开
标题翻译：方法和设备用于构建一个可变长度的错误代码WITH
公开(公告)号：EP1556954A1
公开(公告)日：2005-07-27
申请号：EP03748448.2
申请日：2003-10-14
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine
IPC分类号： H03M13/03
CPC分类号： H03M13/03
摘要： The invention relates to a variable-length error-correcting (VLEC) code technique, in which the main steps are : defining all the needed parameters, generating a code having a fixed length L1, storing in a set W thus obtained all the possible L1-tuples distant of the minimum diverging distance d[min] from the codewords (one extra-bit being affixed at the end of all words if the new set W thus obtained is not empty), deleting all words of W that do not satisfy a distance criterion with all codewords, and verifying that all words of the final set W satisfy another distance criterion. Assuming that most good codes do not have jump of length, the method according to the invention allows to reduce the set of examined VLEC codes. Following this hypothesis, a new construction method, called no hole optimization, is defined, in which it is avoided to add more than one bit at the end of each word of the set W. The new algorithm does not consider very unlikely code structures and thus allows to gain in complexity.

7. 发明公开

EP1540829A1 METHOD AND DEVICE FOR SOURCE DECODING A VARIABLE-LENGTH SOFT-INPUT CODEWORDS SEQUENCE 审中-公开
标题翻译：一条柔软-ENTER码字的源代码End方法和设备序列变量长度
公开(公告)号：EP1540829A1
公开(公告)日：2005-06-15
申请号：EP03795146.4
申请日：2003-09-04
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine
IPC分类号： H03M13/45 , H03M7/30 , H03M7/40 , H03M13/00
CPC分类号： H03M13/3977 , H03M7/30 , H03M7/40 , H03M13/6312 , H03M13/6318
摘要： The invention concerns a method for source decoding a variable-length soft-input codewords sequence (y [1: T]) into a soft-output bit sequence (Lv [1: T]),the variable-length soft-input input codewords sequence (y [1: T]) encoded in accordance with a VLC codewords table.It comprises- a first stage (100) of implementing a stack decoding algorithm for a sequential estimation of an hard-output bit sequence of said variable length soft-input codewords sequence, including storage of intermediate data contained in the stack and generated by the stack decoding algorithm ; and- a second subsequent stage (102) of post-processing the stored intermediate data for generating the soft-output bit sequence (Lv [1: T]), a soft-output (L(x [t])) being provided for each bit.

8. 发明公开

EP1512241A1 METHOD OF CORRECTING AN ERRONEOUS FRAME BY A RECEIVER 审中-公开
标题翻译：程序有故障的框架的接收器来纠正
公开(公告)号：EP1512241A1
公开(公告)日：2005-03-09
申请号：EP03722999.4
申请日：2003-05-19
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine , MERIGEAULT, Sandrine
IPC分类号： H04L1/00
CPC分类号： H04L1/0051 , H04L1/0061
摘要： The present invention relates to a method of processing a received data unit (UDR) by a receiver via a network, the method comprising a channel decoding stage (CDEC1, CDEC2) of the received data unit (UDR), intended to deliver a hard bit string (TBD), a transformation stage for transforming said hard bit string into a hard frame (TD), said hard frame comprising at least an error detector code and a test stage (TST) intended to test with said error correcting code if said hard frame (TD) is correct or incorrect. Said method is characterized in that it further comprises a frame correction stage (COR) intended to correct an incorrect frame (TE) into a correct frame (TCo). In the preferred embodiment of the invention said frame correction stage (COR) utilizes soft data delivered by a soft output channel decoding stage (CDEC2). The advantage of such a method is that rejects and retransmissions of frames are avoided.

9. 发明公开

EP1459493A1 SYSTEM FOR TRANSMITTING ADDITIONAL INFORMATION VIA A NETWORK 审中-公开
标题翻译：系统发送附加信息网络
公开(公告)号：EP1459493A1
公开(公告)日：2004-09-22
申请号：EP02804640.7
申请日：2002-12-06
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine , MERIGEAULT, Sandrine , MEILHAC, Lisa
IPC分类号： H04L29/06 , H04L12/56 , H04N7/24
CPC分类号： H04N21/654 , H04L69/16 , H04L69/161 , H04L69/164 , H04L69/167 , H04L69/22 , H04L69/32 , H04N21/234327 , H04N21/2383 , H04N21/4382 , H04N21/6332 , H04N21/6377 , H04N21/6437 , H04N21/64707 , H04N21/6473 , H04N21/64753 , H04N21/64761 , H04N21/658
摘要： The present invention relates to a transmission system for transmitting source application data units to a destination application via a network comprising a plurality of network protocol stacks. Such a transmission system provides a solution for transmitting additional information from a layer of a first network protocol stack to a layer of a second network protocol stack, without disturbing the way in which ordinary streams are processed. To this end, it further comprises: generating means for generating additional information at a layer of a first network protocol stack to be sent to a layer of a second network protocol stack via at least said first and second network protocol stacks, adapting means for converting said additional information into at least one additional data unit compliant with network protocol rules, marking means for marking said additional data units, retrieving means for retrieving said additional information within said additional data units when said additional data units arrive at said layer of said second network protocol stack. More generally, the invention deals with all the possible exchanges of additional information between layers of network protocol stacks within a transmission system. Said transmission system may also include some routers.

10. 发明公开

EP1449306A1 METHOD OF DECODING A VARIABLE-LENGTH CODEWORD SEQUENCE 有权
标题翻译：方法用于解码序列码字变量长度
公开(公告)号：EP1449306A1
公开(公告)日：2004-08-25
申请号：EP02781522.4
申请日：2002-11-13
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMY, Catherine , MEILHAC, Lisa
IPC分类号： H03M13/45
CPC分类号： H03M7/40
摘要： The present invention relates to a method of source decoding of a variable-length codeword sequence, said decoding being based on an associated codeword table. It is characterized in that it comprises the steps of, a) creating a tree with tree-paths (T_PTH) and branches (B), b) decoding a received sequence (SQr), said step comprising the sub-steps of, 1) extending the best tree-paths (BT PTH) in the tree by computing first cumulative metrics (CM LPTH) of the succeeding branches (B), 2) selecting the codewords (CWDi) corresponding to the best tree-paths (BT_PTH), and saving corresponding data in paths (PTH), the corresponding data comprising second cumulative metrics (CM_STCK), 3) reordering the saved paths (PTH) in accordance with their second cumulative metrics (CM_STCK), 4) testing a priori conditions on top path (TOP_PTH), and if they are verified, outputting said top path, or otherwise returning to the extension sub-step.

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