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Browse Prior Art Database

Distortion Indicator

IP.com Disclosure Number: IPCOM000096656D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Oeters, HR: AUTHOR [+2]

Abstract

The amount that incoming data is distorted is indicated. Incoming data normally occupies a span of time corresponding to fifteen positions of a sample counter SC. Each data bit starts and ends at count nine and is sampled at count one. Therefore, every transition, from 0 to 1 or viceversa, in the input data should normally occur at sample counter position nine.

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Distortion Indicator

The amount that incoming data is distorted is indicated. Incoming data normally occupies a span of time corresponding to fifteen positions of a sample counter SC. Each data bit starts and ends at count nine and is sampled at count one. Therefore, every transition, from 0 to 1 or viceversa, in the input data should normally occur at sample counter position nine.

Due to drifting of data out of synchronism with the sample counter, transitions occur at counter positions other than nine. A continuous drift in one direction or the other, over a fixed period, indicates a prohibited amount of distortion. The amount of distortion occurring on a data input is determined by regularly checking either the maximum or minimum sample counter position at which transitions occur.

As shown, a transition detector sends the sample counter contents at the time of transition to a register R, if, and only if, the counter contents are less than the current register contents. Thus, the register contains the lowest sample counter value at which an input data transition occurred. Indications are read by an operator at regular intervals to determine whether the drift, since the time of the last reading, exceeds permissible limits.

Drift toward higher counter readings are inspected by setting the switch to the R <SC position.

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