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    • 12. 发明申请
    • WAVEFORM EQUALIZER FOR OBTAINING A CORRECTED SIGNAL AND APPARATUS FOR REPRODUCING INFORMATION
    • 波形均衡器,用于获取更正信息的校正信号和设备
    • WO2003005356A2
    • 2003-01-16
    • PCT/IB2002/002372
    • 2002-06-20
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.STEK, AalbertLINOTTE, Peter, M.JANSEN, Theodorus, P., H., G.
    • STEK, AalbertLINOTTE, Peter, M.JANSEN, Theodorus, P., H., G.
    • G11B20/00
    • 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.
    • 波形均衡器(6)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'。 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)以及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的限幅装置(62) 信号S除以预定的幅度限制值。 提供第二滤波器(63),其能够对所述限幅读取信号SLIM执行滤波处理。 此外,存在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而获得的信号相加的加法器(64),其能够生成加法结果作为所述校正的读取信号S' 。 所述波形均衡器(6)对幅度小于所述预定幅度限制值的信号的信号频率响应在从零到信号频率响应处于最大幅度的频率的第一频率区域中具有陷波。 用于再现记录在具有波形均衡器(6)的信息载体(1)上的信息的设备能够读取具有较高S / N比和较低数据抖动的信息。 结果,信息再现设备可以用于更高的比特密度并且同时具有可接受的S / N比和数据抖动。
    • 14. 发明申请
    • MAGNETIC SENSOR DEVICE WITH ROBUST SIGNAL PROCESSING
    • 具有稳健信号处理的磁性传感器装置
    • WO2008075274A3
    • 2008-08-21
    • PCT/IB2007055114
    • 2007-12-14
    • KONINKL PHILIPS ELECTRONICS NVVEEN JEROENJANSEN THEODORUS P H GDE BOER BART MKAHLMAN JOSEPHUS A H M
    • VEEN JEROENJANSEN THEODORUS P H GDE BOER BART MKAHLMAN JOSEPHUS A H M
    • G01N33/543G01R33/09G01R33/12
    • G01R33/093B82Y25/00G01R33/1269
    • The invention relates to a magnetic sensor device (100) comprising a magnetic field generator (1) driven with an excitation current of a first frequency (f 1 ) and a magnetic sensor element (e.g. a GMR sensor (2)) driven with a sensor current (I 2 ) of a second frequency (f 2 ) for measuring reaction fields (H B ) generated by magnetized particles (3). In an associated evaluation unit (10), a reference component (u Q ) of the measurement signal (u GMR ) is separated that depends on the excitation current (I 1 ) and the sensor current (I 2 ) but not on the presence of magnetized particles (3). The reference component (u Q ) may particularly be produced by a combination of the self- magnetization (H 2 ) of the magnetic sensor element (2) and cross-talk related currents. The reference component (u Q ) may be isolated based on its phase with respect to a particle-dependent component of the measurement signal (u GMR ) or based on its scaling with one of the current frequencies. Monitoring of the reference component (u Q ) reveals variations in operating conditions, for example in the sensor gain, that can be used to calibrate the measurement results.
    • 本发明涉及一种磁传感器装置(100),该磁传感器装置(100)包括利用第一频率(f 1)的激励电流驱动的磁场发生器(1)和磁传感器元件(例如GMR传感器 2))以第二频率(f 2 )的传感器电流(I 2 )驱动,以测量产生的反应场(H B ) 通过磁化粒子(3)。 在相关的评估单元(10)中,测量信号(u GMR )的参考分量(u Q )被分开,其取决于激励电流(I 1 )和传感器电流(I 2 ),但不存在磁化粒子(3)。 特别地,参考分量(u Q)可以通过磁传感器元件(2)的自磁化(H 2 SUB)和串扰相关 电流。 可以基于其相对于测量信号的微粒相关分量(u GMR )的相位或基于其相对于其测量信号的缩放来隔离参考分量(u Q 当前频率之一。 监测参考组分(u Q )可以发现运行条件的变化,例如传感器增益,可用于校准测量结果。
    • 18. 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。