Title :
Hilbert filter for double-layer perpendicular recording media
Author :
Muraoka, H. ; Hassner, M. ; Sonobe, Y. ; Nemoto, H. ; Yamamoto, S. ; Berman, D. ; Rossi, A. ; Nakamura, Y.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
Abstract :
Summary form only given. Readback waveforms from GMR heads in perpendicular magnetic recording are completely different from the regular longitudinal recording waveforms. Proper signal equalization is therefore critical. For this purpose a Hilbert filter is discussed. This filter is known to transform the dipulse response from a single layer perpendicular media into a longitudinal signal, however, for double layer perpendicular media with a soft magnetic underlayer its properties have not been reported yet. In this paper the authors discuss the performance of the Hilbert filter for double-layer perpendicular recording media.
Keywords :
FIR filters; Hilbert transforms; digital filters; equalisers; perpendicular magnetic recording; signal processing; FIR filter; GMR heads; Hilbert filter; dipulse response transformation; double layer perpendicular media; longitudinal signal; perpendicular magnetic recording; readback waveforms; signal equalization; soft magnetic underlayer; transfer function; Equalizers; Finite impulse response filter; Frequency; Ground penetrating radar; Magnetic heads; Magnetic separation; Microelectronics; Perpendicular magnetic recording; Semiconductor device measurement; Transfer functions;
Conference_Titel :
Magnetics Conference, 2002. INTERMAG Europe 2002. Digest of Technical Papers. 2002 IEEE International
Conference_Location :
Amsterdam, The Netherlands
Print_ISBN :
0-7803-7365-0
DOI :
10.1109/INTMAG.2002.1001446
