In 1958, Panel 6 (Levels of Picture Quality) of the Television Allocations Study Organization conducted a comprehensive study of the subjective effects on picture quality of a number of types of interfering signals and noise, as functions of the levels of interference. These tests were designed and carried out by teams of engineers and experimental psychologists using a selective group of lay observers. This paper deals with the design of the tests and with the laboratory facilities used in the tests.
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Fredendall et al. (1960) studied this question.