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A System For Deskewing Tape Signals

IP.com Disclosure Number: IPCOM000095464D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Scherr, AL: AUTHOR [+2]

Abstract

To eliminate tape skew in the information signals transduced from a multitrack tape, the time base of the signals is converted to store the signals dynamically. In the system, delay lines having fixed time periods within them are utilized as the dynamic storage media. The total fixed time of the delay line cannot exceed the total time difference between bits of a given track. The number of bits which can be stored in the delay line should be sufficient to accommodate the maximum number of bits of skew.

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A System For Deskewing Tape Signals

To eliminate tape skew in the information signals transduced from a multitrack tape, the time base of the signals is converted to store the signals dynamically. In the system, delay lines having fixed time periods within them are utilized as the dynamic storage media. The total fixed time of the delay line cannot exceed the total time difference between bits of a given track. The number of bits which can be stored in the delay line should be sufficient to accommodate the maximum number of bits of skew.

Each track 1, 2 and 3 of the tape has a pair of delay lines 1, 2 and 3, 4 and 5, 6, respectively, associated with it. The delay lines have recirculating circuitry which can include synchronizing and timing circuits. Data from each tape track is gated into its respective delay lines, e.g., track 1 data is gated into delay lines 1 and 2, with all bits of a character entered into the same relative bit position.

A pair of delay lines is utilized for each track of information for the encoding of the data in corresponding time periods of the paired delay lines. The code which is employed is as follows: Contents of Upper Contents of Lower Information

Delay Line Delay Line Represented

0 0 No bit

0 1 Binary Zero

1 0 Binary One

1 1 Mark The Mark representation is employed in the time period of the paired delay lines immediately preceding the first time period in the delay lines containing information signals transduced from the tape. The No Bit representation indicates that the particular...