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    • 2. 发明申请
    • METHOD OF ENCODING AND DECODING
    • 编码和解码的方法
    • WO03061139A2
    • 2003-07-24
    • PCT/IB0205413
    • 2002-12-12
    • KONINKL PHILIPS ELECTRONICS NVSTEK AALBERTSCHEP CORNELIS MBLUM MARTINUS W
    • STEK AALBERTSCHEP CORNELIS MBLUM MARTINUS W
    • G06F11/10G11B20/14G11B20/18H03M13/09H03M13/15
    • H03M13/616G06F11/10G11B20/1833H03M13/1515H03M13/2942H03M13/3761H03M13/63H03M13/6516
    • The invention relates to a method of encoding user data into codevectors and to a corresponding method of decoding codevectors into user data. In order to be able to use the same ECC decoder for decoding of more than one type of data a method of encoding is proposed comprising the steps of: a) generating a first block of a fixed first number of data symbols by taking a fixed second number, being smaller than said first number, of user data symbols, and a fixed third number of dummy data symbols, and by arranging said user data symbols and said dummy data symbols in a predetermined order, b) encoding said first block of data symbols using an ECC encoder (2) to obtain a codeword having a fixed number of symbols, said codeword comprising said first block of data symbols and a second block of a fixed forth number of parity symbols, and c) generating a codevector by selecting a fifth predetermined number of user data symbols and a sixth predetermined number of parity symbols from said codeword, the sum of said fifth and sixth number being predetermined and smaller than the sum of said second and forth number.
    • 本发明涉及一种将用户数据编码为码向量的方法以及将码向量解码为用户数据的对应方法。 为了能够使用相同的ECC解码器来解码多于一种类型的数据,提出了一种编码方法,包括以下步骤:a)通过采取固定的第二数据符号来产生固定的第一数量的数据符号的第一块 数字,小于所述第一数量的用户数据符号,以及固定的第三数量的虚拟数据符号,并且以预定顺序布置所述用户数据符号和所述虚拟数据符号,b)编码所述第一数据符号块 使用ECC编码器(2)来获得具有固定数目符号的码字,所述码字包括所述第一数据符号块和固定的第三数量的奇偶校验符号的第二块,以及c)通过选择第五 预定数量的用户数据符号和来自所述码字的第六预定数量的奇偶校验符号,所述第五和第六数字的总和是预定的并且小于所述第二和第四数目之和。
    • 4. 发明申请
    • WAVEFORM EQUALIZER FOR OBTAINING A CORRECTED SIGNAL AND APPARATUS FOR REPRODUCING INFORMATION
    • 用于获取校正信号的波形均衡器和重现信息的装置
    • WO03005356A3
    • 2003-05-22
    • PCT/IB0202372
    • 2002-06-20
    • KONINKL PHILIPS ELECTRONICS NVSTEK AALBERTLINOTTE PETER MJANSEN THEODORUS P H G
    • STEK AALBERTLINOTTE PETER MJANSEN THEODORUS P H G
    • G11B20/10H03H17/02H03H17/06
    • G11B20/10009
    • The waveform equalizer (6) for obtaining a corrected signal S' by performing a waveform equalization to a read signal S read out from an information carrier (1). The waveform equalizer (6) has a first filter (61) able to perform a filtering process to said read signal S, and an amplitude limiting means (62) able to obtain an amplitude limited read signal SLIM by limiting an amplitude level of said read signal S by a predetermined amplitude limitation value. A second filter (63) is provided which is able to perform a filtering process to said amplitude limited read signal SLIM. Further, an adder (64) is present which is able to add the signals obtained by performing the filtering process by each of said first (61) and second filters (63), able to generate an addition result as said corrected read signal S'. The signal frequency response of said waveform equalizer (6) to signals having an amplitude smaller than said predetermined amplitude limitation value, has a notch in a first frequency region from zero to a frequency at which the signal frequency response is at a maximum amplitude. The apparatus for reproducing information recorded on an information carrier (1), having the waveform equalizer (6) is able to read the information with a higher S/N ratio and a lower data jitter. As a result the information reproducing apparatus can be applied for a higher bit density and at the same time having a acceptable S/N ratio and data jitter.
    • 用于通过对从信息载体(1)读出的读取信号S执行波形均衡来获得校正信号S'的波形均衡器(6)。 波形均衡器(6)具有能够对所述读取信号S执行滤波处理的第一滤波器(61)和能够通过限制所述读取的幅度电平来获得限幅读取信号SLIM的幅度限制装置(62) 信号S以预定的幅度限制值。 提供了能够对所述限幅读取信号SLIM执行滤波处理的第二滤波器(63)。 此外,存在加法器(64),其能够将通过执行所述第一(61)和第二滤波器(63)中的每一个的滤波处理获得的信号相加,能够产生作为所述校正的读取信号S' 。 所述波形均衡器(6)对具有小于所述预定幅度限制值的振幅的信号的信号频率响应在从零到信号频率响应处于最大振幅的频率的第一频率区域具有陷波。 用于再现记录在具有波形均衡器(6)的信息载体(1)上的信息的装置能够以较高的S / N比和较低的数据抖动来读取信息。 因此,信息再现装置可以应用于较高的比特密度,同时具有可接受的S / N比和数据抖动。