Observers compared the interfering effect of multiple echoes with that of single echoes in black-and-white television pictures. The multiple echoes were 2, 4 or 8 echoes of equal strength but different delays. The single echoes were 40, 35 or 30 db weaker than the main signal. A method for estimating addition effects of several echoes is presented and demonstrated to be consistent with the test results.
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Fowler et al. (1952) studied this question.
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