| 摘要 |
<p>Magnetic head (49) for reading digital magnetic information on a magnetic recording support (9), in which three or more magnetic sensors (12, 13, 14) are provided per recording track. An increase in the recording density of signals on the magnetic recording support (9) is achieved by equalization of the playback signals in the local region. The desired reduction in the half amplitude width (33) of playback signals is achieved by the interconnection of the output signals which differ in value and polarity from at least three sensors (12 to 14), which simultaneously scan the environment of a magnetic flux change in the information carrier. The distance between the sensors (12 to 14) in the recording direction (11) corresponds approximately to half of the half amplitude width (33) of the local resolution of the central sensor (12). The differing value of the output signals (32, 34, 35) occurs because of the differing geometrical dimensions of the sensors (12 to 14). The different polarity of the signal (32) of the central sensor (12) compared with the signals (34, 35) of the adjacent sensors (13, 14) can be obtained, in the case of magnetoresistive sensors by the choice of the operating points (68, 69, 70) in the regions of increases in the characteristic curve having differing signs. The equalization in this magnetic head arrangement operates irrespective of the speed at which the magnetic recording carrier (9) moves.</p> |
