Browse Prior Art Database

Write Over Distortion Measuring System

IP.com Disclosure Number: IPCOM000074431D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Bekkers, G: AUTHOR [+3]

Abstract

Write-over distortion is encountered when reading information which was written over previous information on a magnetic medium without erasing the previously recorded information. This write-over distortion measuring system measures the amount of distortion found in such a signal. As illustrated, the signal is applied differentially to the two inputs of the automatic gain control amplifier 11 which removes the amplitude modulation from the input. The two outputs of the AGC 11 are connected to comparators 12 and 13, respectively, for comparing the positive and negative pulse outputs of AGC 11 with reference voltages 14 and 15. Whenever the reference voltage of the comparator is less than the input voltages from the AGC circuit 11 the comparator will generate a pulse.

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 100% of the total text.

Page 1 of 2

Write Over Distortion Measuring System

Write-over distortion is encountered when reading information which was written over previous information on a magnetic medium without erasing the previously recorded information. This write-over distortion measuring system measures the amount of distortion found in such a signal. As illustrated, the signal is applied differentially to the two inputs of the automatic gain control amplifier 11 which removes the amplitude modulation from the input. The two outputs of the AGC 11 are connected to comparators 12 and 13, respectively, for comparing the positive and negative pulse outputs of AGC 11 with reference voltages 14 and 15. Whenever the reference voltage of the comparator is less than the input voltages from the AGC circuit 11 the comparator will generate a pulse. Pulses appearing at the output of comparators 12 and 13 are counted by counters 16 and 17, respectively. The output of the counters indicate the write- over distortion.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]