Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Page scan 000599 from Journal of the Society of Motion Picture and Television Engineers

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000599
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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A. UNDISTORTED ECHO B. DIFFERENTIATED ECHO -ADVANTAGE AT UPPER CUTOFF f Fig. 17. Differing amplitudes of undistorted and differentiated echoes that are equally perceptible. TOLERANCE ON PHASE DELAY EXCURSIONS Fig. 18. Tolerance on phase delay for differentiated echoes. progressively increasing excursions with frequency. At this point we may consider how the eye compares a differentiated with a distortionless echo in its capability of impairing the picture. Diagrammatieally the two are illustrated in Fig. 17. It is found that at the cutoff frequency a substantially larger response is permitted for the differentiated than for the undistorted echo. This is called the "ad vantage at upper cutoff" in the figure. Some experimental determinations of this quantity are reported in the Mertz, Fowler and Christopher reference already noted.7 A tabulation is given herewith of the echo attenuation required for the median observers for a just perceptible echo, as plotted in two figures of that paper. The attenuation is measured in each case at 4 me. 590 May 1953 Journal of the SMPTE Vol. 60