Abstract
This chapter focuses on measurement of TV camera noise. The measurement of noise at the output of a TV camera, or its camera tube, has always been a problem. The TV system requires a scanning waveform that has a maximum useful scan time and a minimum return time. Signals including noise usually appear different when read from the storage surface during return scan from what they do during the forward scan. This is particularly true if there is significant dark current, for then the average signal level is different. For a physical measurement of noise by a thermal-power meter these blanking pulses and all spurious signals during return must be gated out, but by a method which introduces a switching signal power which is insignificant compared with the noise power to be measured. Because there are available today transistors with sufficiently low input to output capacitance, it is quite possible to build a video gate which gates out the blanking pulses at the output of a TV camera or camera tube. This makes possible the direct measurement of noise by means of a thermal-power meter in the conventional manner.
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