A Graticule for the Measurement of Short-Time Waveform Distortion in Television Facilities and Subjective Impairments in Television Pictures
Hans Joachim Schmid · SMPTE Journal · 1976
A Short-Time Waveform Distortion (SD) graticule was proposed by this author in September 1971. In December 1972, A. M. Lessman published echo-time weighting data that can be used as the basis for designing an oscilloscope graticule. Echo-time weighting as such is of little practical usefulness and must be converted into amplitude-time weighting to become the basis for an operational graticule. It is shown that in certain parts there is remarkably good agreement between the proposed SD graticule and the amplitude-time weighting derived from Lessman's echo-time weighting data, while other parts of the derived amplitude-time weighting are either inapplicable or of negligible significance.