Electronic video tape evaluator.

摘要

Video recording tape is evaluated by first recording a color bar test pattern and then playing back the recorded information to provide an r-f signal from the tape. A drop-out detector (12) generates a change in output level during the time the r-f signal drops below a predetermined level. The output of the drop-out detector is applied to a weighting and averaging circuit (14) that averages a plurality of pulses from the dropout detector over a time period that is long compared to the normal duration of signal drop-outs.