Browse Prior Art Database

Digital Tape Recording

IP.com Disclosure Number: IPCOM000052131D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Rohen, JE: AUTHOR [+3]

Abstract

Magnetic tape 1 is wound onto takeup spool 2, driven at relatively constant angular velocity by capstan 3. This winding produces a linear tape velocity past recording head 4 that increases with the diameter of tape wound onto spool 2. To obtain uniformly spaced bit recordings for short records, the current average velocity of tape 1 is determined through the use of read head 5, which is spaced a predetermined distance downstream of head 4.

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Digital Tape Recording

Magnetic tape 1 is wound onto takeup spool 2, driven at relatively constant angular velocity by capstan 3. This winding produces a linear tape velocity past recording head 4 that increases with the diameter of tape wound onto spool 2. To obtain uniformly spaced bit recordings for short records, the current average velocity of tape 1 is determined through the use of read head 5, which is spaced a predetermined distance downstream of head 4.

At the start of a recording operation, head 4 records a transition and initiates the operation of a free-running counter 6. When head 5 senses the transition, counter 6 is stopped, thereby indicating by its accumulated count the average velocity of tape 1. The count is applied to logic circuit 7 which controls clock oscillator 8 to produce clock bits on line 9 for control of the rate of delivery of record bits to recording head 4, such that bits are recorded at intervals which are the same regardless of the diameter of the tape wound on spool 2.

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