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Signal Recorder Testing employing Error Detection and Timed Amplitude Testing

IP.com Disclosure Number: IPCOM000083496D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Andresen, R: AUTHOR [+3]

Abstract

Testing a unit, such as a rotating head magnetic tape recorder, is enhanced by simultaneously reading data patter s from the unit under test and sampling amplitudes in a predetermined phase relationship to signals being read from the unit. The detected data and amplitudes are forwarded in timed relationship to an analysis system, not shown, such as a programmed digital computer.

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Signal Recorder Testing employing Error Detection and Timed Amplitude Testing

Testing a unit, such as a rotating head magnetic tape recorder, is enhanced by simultaneously reading data patter s from the unit under test and sampling amplitudes in a predetermined phase relationship to signals being read from the unit. The detected data and amplitudes are forwarded in timed relationship to an analysis system, not shown, such as a programmed digital computer.

The unit under test supplies an analog signal and a detected digital data signal to the analysis system. The analog signal has periodic data byte cycles. A clock is slaved to the analog signal for defining the data byte cycles and timing the serial digital data signal.

An amplitude sampler, as shown at the bottom of the drawing, receives the analog signal in synchronism with the serial digital data signal and clock. The sampler includes differential amplifier 1, two voltage comparators, a pair of differentially connected transistors, and isolating amplifier 2.

An output analog-to-digital converter is timed by the clock to supply a set of digital signals signifying the amplitude at the amplitude sample time, for comparison analysis with respect to data. These amplitude converted signals are then multiplexed into a deserialized digital data pattern. Finally, the data is presented to a programmed digital computer as timed by the clock.

A computer, not shown, is programmed to detect digital data errors and to analyz...