Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Comparing counts
Patent
1995-07-03
1996-07-23
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Comparing counts
360 51, 360 7708, 377 56, G11B 5596, H03K 2110
Patent
active
055397956
ABSTRACT:
A sector pulse generating apparatus for multiple zone recording includes only first and second counters. The first counter counts reference clock pulses and outputs a present position signal. The second counter is incremented in response to a increment signal and outputs a next sector number signal. A first register stores the sector length of a zone in which a head is located. A multiplier outputs a next sector position signal representative of a multiplication of the next sector number and the sector length. A first comparator compares the magnitude of the present position and the next sector position. When the present position and the next sector position match, a sector pulse generating device generates a sector pulse and a first increment device outputs the increment signal.
REFERENCES:
patent: 3944858 (1976-03-01), Pettersson
patent: 4079234 (1978-03-01), Kashio
patent: 5048063 (1991-09-01), Isobe et al.
patent: 5367550 (1994-11-01), Ishida
patent: 5430781 (1995-07-01), Miyake et al.
patent: 5440474 (1995-08-01), Hetzler
Heyman John S.
NEC Corporation
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