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The term skew, generally referring to some difference from an expected or optimal value, is common in both telecommunications and mathematics.


Note: Skew is usually interpreted to mean the difference in reading times between bits recorded on the tracks at the extremities, or edges, of the tape.

  • In facsimile systems, the angular deviation of the received frame from rectangularity caused by asynchronism between the scanner and the recorder.

Note: Skew is expressed numerically as the tangent of the deviation angle.

  • In facsimile, the angle between the scanning line, or recording line, and the perpendicular to the paper path.
File:Skew 1 degree.png
Example of +1 degree (counter-clockwise) skew in a facsimile image. The red line is perfectly horizontal.

Source: from Federal Standard 1037C and from MIL-STD-188