Graticules for Judging Television Waveforms
The following three papers deal with the subject of using a graticule or overlay on an oscilloscope to help determine whether or not a television waveform will produce a subjectively acceptable picture. Aspects of this subject have been discussed as far back as 1947–1948. The concept of echo weighting and several data involved in the concept were described in a Journal paper of May 1953 (Influence of Television Transmission Echoes). — It is interesting to see how the concept has become more definite and formalized and how the requirements have become somewhat less severe. In the early days, the communications people were scared of picture deterioration and afraid of the consequences of possible miscalulation. Present-day engineers are more firmly certain, because of the widespread experience, of their tolerances. For a long time, because of the limited precision and stability of cathode-ray oscilloscopes, it was deemed impractical to use graticules as indicators, but engineers can now predict with some confidence the result of a particular waveform adjustment. It is now reasonable to assert that the industry should settle on a standard graticule for evaluating television transmission in North America.
- Print ISSN
- 0036-1682
- Published
- 1976-06
- Content type
- Original Research
- DOI
- 10.5594/J06819