发明名称 |
Method of reading addresses on a magnetic recording medium and apparatus for putting it into effect |
摘要 |
Items of information written in a binary code on a plurality of magnetic disc tracks are read by a magnetic head. The address for each track is written in a reference zone having a plurality of cells equal to the number of bits in the address. A constant frequency cyclic reference signal H is divided by logic pulses from the head to produce a signal SYNCHRO. The bit of each address is determined by combining the SYNCHRO signals and a pulse representative of the binary value of each bit that depends on the temporal position of a pulse within a period of signal SYNCHRO. The number of cells is counted, each time a bit is determined. The address is sampled bit by bit and transferred to a storage member throughout the counting and sampling operations.
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申请公布号 |
US4134138(A) |
申请公布日期 |
1979.01.09 |
申请号 |
US19770765057 |
申请日期 |
1977.02.02 |
申请人 |
COMPAGNIE INTERNATIONALE POUR L"INFORMATIQUE CII HONEYWELL BULL |
发明人 |
CARDOT, CLAUDE R.;DROUX, JACQUES P.;OISEL, ANDRE J. |
分类号 |
G11B20/10;G11B27/10;(IPC1-7):G11B5/09 |
主分类号 |
G11B20/10 |
代理机构 |
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代理人 |
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地址 |
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