Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Data Detection System

IP.com Disclosure Number: IPCOM000096764D
Original Publication Date: 1963-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Brady, RL: AUTHOR [+2]

Abstract

This magnetic drum or disc system, in which addresses appearing on one track identify associated records appearing on other tracks, has devices allowing the use of addresses which comprise bursts of 1 bits. The number of such bursts corresponds to the identity of the associated record. By using bursts of 1 bits, the system tolerates a number of missing bits from the bursts so long as a sufficient number of bits remain to identify a burst.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Page 1 of 2

Data Detection System

This magnetic drum or disc system, in which addresses appearing on one track identify associated records appearing on other tracks, has devices allowing the use of addresses which comprise bursts of 1 bits. The number of such bursts corresponds to the identity of the associated record. By using bursts of 1 bits, the system tolerates a number of missing bits from the bursts so long as a sufficient number of bits remain to identify a burst.

When a particular record is desired, the record number is entered in record number register 10. As the bursts are detected by read head 11, amplifier 12 and burst detector circuit 13, counter 14 is advanced once for each burst, not once for each bit. Compare logic 15 continually matches the bit by bit status of counter 14 with register 10. Upon the occurrence of a match, logic 15 provides an output signal on line 16 for the duration of the matched condition. The output of detector 13 also drives group detector 17, which is a fast set, slow dropout circuit. As successive bursts, in the same group, occur before the dropout period elapses, the circuit continues to remain set over the entire group. Dropout then occurs approximately 200 microseconds after the end of a group. The output is obtained from the off side of the circuit and, therefore, is active only during the space time between groups. The space signal operates sample timer 18 which transmits a 12 microsecond gating signal to And 19, thus gating line...