公开(公告)号：DE69415088D1

公开(公告)日：1999-01-21

申请号：DE69415088

申请日：1994-05-31

Applicant: IBM

Inventor： COMEAUX WAYNE THOMAS ,  GRAVES DAVID CONRAD ,  JOHNSON DOUGLAS WAYNE

IPC: G11B5/09 ,  G11B5/55 ,  G11B5/584 ,  G11B20/12

Abstract: A magnetic tape (21) has three evenly spaced-apart longitudinally-extending servo track areas (40-42). Four equal-sized longitudinally-extending data track areas (45-48) are disposed between said servo track areas (40-42) and between longitudinal edges of the tape (21) and one of said data track areas (45-48). All servo track areas (40-42) are simultaneously sensed for producing one head positioning signal (100). Data tracks are arranged into four groups of tracks (45-48), one-half of the data tracks in each group are concurrently accessed. The data tracks on the tape are arranged in clusters. Each cluster has one track from each of the groups of tracks. Two laterally-adjacent track clusters constitute four data track wraps for serpentine scanning of data tracks. The concurrent track accessing respectively occurs in first and second halves of a data track wrap. Each servo area indicates two lateral positions of the tape to the head (27). The lateral spacing between the lateral positions is equal to about a data track width. This arrangement makes the servo areas field writable.

公开(公告)号：DE69415088T2

公开(公告)日：1999-07-15

申请号：DE69415088

申请日：1994-05-31

Applicant: IBM

Inventor： COMEAUX WAYNE THOMAS ,  GRAVES DAVID CONRAD ,  JOHNSON DOUGLAS WAYNE

IPC: G11B5/09 ,  G11B5/55 ,  G11B5/584 ,  G11B20/12

Abstract: A magnetic tape (21) has three evenly spaced-apart longitudinally-extending servo track areas (40-42). Four equal-sized longitudinally-extending data track areas (45-48) are disposed between said servo track areas (40-42) and between longitudinal edges of the tape (21) and one of said data track areas (45-48). All servo track areas (40-42) are simultaneously sensed for producing one head positioning signal (100). Data tracks are arranged into four groups of tracks (45-48), one-half of the data tracks in each group are concurrently accessed. The data tracks on the tape are arranged in clusters. Each cluster has one track from each of the groups of tracks. Two laterally-adjacent track clusters constitute four data track wraps for serpentine scanning of data tracks. The concurrent track accessing respectively occurs in first and second halves of a data track wrap. Each servo area indicates two lateral positions of the tape to the head (27). The lateral spacing between the lateral positions is equal to about a data track width. This arrangement makes the servo areas field writable.

公开(公告)号：DE3472323D1

公开(公告)日：1988-07-28

申请号：DE3472323

申请日：1984-10-16

Applicant: IBM

Inventor： GRAVES DAVID CONRAD ,  SCHNEIDER RICHARD CRANE ,  ZIMMERMANN VOLKER

IPC: H03H21/00 ,  G11B5/035 ,  G11B20/10 ,  H04B3/04

Abstract: @ An adaptive equalization circuit for magnetic recording channels which derives an error signal to change the equalizer compensation value from the timing of random signal data and provides continuous feedback compensation.In the Figure data from read head (21a) is amplified by amplifier (22a) and partially equalized in fixed equalizer (23a). The signal is applied to summation circuit (49) which receives a variable correction input signal. The summed signal is applied to data pulser circuit (24a) which provides output pulses to detector circuit (26a) and variable frequency clock (25a) at times of positive or negative peaks in the . received signal. The correction signal is derived from an equalization filter circuit (48) controlled by the output of a variable gain amplifier (47), the gain of which is set by the voltage on line (65). This voltage is determined by circuitry (69) from the three input supplied thereto.