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Bit Ring Synchronization to Magnetic Recorded Data

IP.com Disclosure Number: IPCOM000081230D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Ice, WE: AUTHOR

Abstract

In read/write circuitry, it is necessary to synchronize a bit ring with data at the beginning of a record so each recorded data bit can be weighted or assigned a numeric value. Previous designs have used the binary pattern of 00001110 and 00000001. Both of these patterns depended on the first one bit to synchronize the bit ring to the data.

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Bit Ring Synchronization to Magnetic Recorded Data

In read/write circuitry, it is necessary to synchronize a bit ring with data at the beginning of a record so each recorded data bit can be weighted or assigned a numeric value. Previous designs have used the binary pattern of 00001110 and
00000001. Both of these patterns depended on the first one bit to synchronize the bit ring to the data.

A small error in sync area preceding the sync pattern will cause incorrect starting of the bit ring, with the consequent inability to read error-free data.

This method requires the entire binary pattern to be read correctly and the pattern is repeated twice, so a second chance to sync the bit ring is available. One such pattern could be: 00011001 | 11111001 | 000XXXXX

The synchronizing procedure is to sync the hit ring on detecting 11001. The first three bits following the sync of the bit ring are tested to determine which of the two sync bytes was detected. or more 11s: T he bit ring was synced by the first byte.

All 0's: The bit ring failed to sync on the first byte and is synced on the second.

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