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Analog Noise Signal Injector

IP.com Disclosure Number: IPCOM000049419D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Monson, RP: AUTHOR

Abstract

In order to project hard and soft errors in a disk storage file for a computer system, large levels of noise are injected into the file. The large noise levels cause the errors in a very short period of time compared to past techniques. The noise is generated by an analog noise signal injector 20 (Fig. 1) which receives random digital values from IBM Series/1 computer 10. Upon receipt of the digital values from Series/1, a digital to analog converter 21 (Fig. 2) in analog noise signal injector 20 converts the digital value into an analog voltage. The analog voltage is then sent to electronic switch 22 which either lets the analog voltage pass through to the low-pass filter 23 or else blocks the voltage. The analog switch is controlled by the rigid file access control signal on line 24.

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Analog Noise Signal Injector

In order to project hard and soft errors in a disk storage file for a computer system, large levels of noise are injected into the file. The large noise levels cause the errors in a very short period of time compared to past techniques. The noise is generated by an analog noise signal injector 20 (Fig. 1) which receives random digital values from IBM Series/1 computer 10. Upon receipt of the digital values from Series/1, a digital to analog converter 21 (Fig. 2) in analog noise signal injector 20 converts the digital value into an analog voltage. The analog voltage is then sent to electronic switch 22 which either lets the analog voltage pass through to the low-pass filter 23 or else blocks the voltage. The analog switch is controlled by the rigid file access control signal on line 24. The control signal turns off the electronic switch whenever file 30 (Fig. 1) is accessing, but turns on electronic switch 22 whenever file 30 is in a track-following mode.

When file 30 is in a track-following mode, electronic switch 22 is on, and the analog voltage goes from the digital to analog converter 21 directly to the low- pass filter 23. The function of the low-pass filter is to slowly allow the analog voltage generated by the digital to analog converter 21 to enter into the rigid file servo injection electronics. If the analog voltage was not slowly allowed to enter the servo injection electronics, the rapid voltage change would cause the servo...