Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1993-09-21
1995-09-19
Young, W. R.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 61, G11B 509, G11B 1512
Patent
active
054521475
ABSTRACT:
Each track on a recording medium 1 is divided into a plurality of sectors, each of which comprises a head positioning information area and a data area. Signals read out of the recording medium 1 undergo wave shaping by a low-pass filter 4 and a differentiating circuit 5. An index pulse generator 8 generates an index pulse indicating the reference position of each track on the basis of an index hole detected by a detector 7. A control circuit 20, on the basis of the index pulse, generates a control signal for distinguishing the head positioning information area and the data area from each other. The low-pass filter 4 and the differentiating circuit 5, each in accordance with a control signal, switch between their two frequency characteristics.
REFERENCES:
patent: 4244008 (1981-01-01), Holt
patent: 4644419 (1987-02-01), Iinuma et al.
patent: 4656533 (1987-04-01), Sakai et al.
patent: 4870514 (1989-09-01), Enami et al.
patent: 5321559 (1994-06-01), Nguyen et al.
JP reference No. 3-42517, Abstract, Ishii et al., May 14, 1991.
Miyazaki Osamu
Nakashima Hiroshi
Yamashita Mitsunori
Kim Won Tae C.
NEC Corporation
Young W. R.
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