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t.v. test patterns
Asked by: gschofield728
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when did they use them
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Back in the fifties and sixties, test patterns were used to adjust the contrast, vertical and horizontal holds and sharpness on black & white T.V.'s They were on the screen before programming began and after programming was over - no 24/7 programming back then!
Answer Date: 10:12am 09/30/08
