ANALOG VIDEO SIGNAL
Signal in which the output varies as a continuous function of the input, while the values of the transmitted information are within defined limits. Any variation in an analog video signal may represent a specific video parameter, e.g., when the luminance signal is high (0.7 V above black level) the picture is very bright. When the signal is low (0.1 V), the picture is very dark, at 0 V the picture is totally black. TTL digital signals, in contrast, are predefined as only 0 or 5 V or other fixed logic levels, and do not vary.
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