发明名称 |
Waveform equalizer for obtaining a corrected signal and apparatus for reproducing information |
摘要 |
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.
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申请公布号 |
US7196997(B2) |
申请公布日期 |
2007.03.27 |
申请号 |
US20030481145 |
申请日期 |
2003.12.17 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
STEK AALBERT;LINOTTE PETER MARCHEL;JANSEN THEODORUS PETRUS HENRICUS GERARDUS |
分类号 |
G11B5/09;G11B20/10;H03H17/02;H03H17/06 |
主分类号 |
G11B5/09 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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