Effective Sum of Multiple Echoes in Television
A. D. Fowler, H. N. Christopher · Journal of the Society of Motion Picture and Television Engineers · 1952
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.