Importance

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Abstract

A circuit for selectively converting a color bar pattern, comprising a switching means for selectively converting the circuit to the EIA mode or SMPTE mode, a line selecting means for counting the input number of the horizontal control signal reset by means of the vertical control signal and outputting the reversed chrominance forming signal in the line on which the reversed chrominance set is to be formed and outputting the pedestal forming signal in the line on which the pedestal set is to be formed, on said SMPTE color bar pattern by combining counting value thereof with the chrominance control signal, a reversed chroma set forming means for outputting said chrominance signal as it is if the reversed chrominance forming signal is not input from the line selecting means, and for outputting said chrominance forming after converting the color signal into the converting color signal forming said reversed chroma set if the reversed chrominance forming signal is input, a pedestal position selecting means for distributing a interval between said horizontal control signals as the reference, said reference pulse being reset by means of the horizontal control signal, and for outputtting the set-up level forming signal in the position where said pedestal set is to be formed on the SMPTE color bar pattern if the pedestal signal is input from the line selecting means, and a pedestal level forming means for receiving the set-up level forming signal of the pedestal position selecting means and for outputting the level up/down signal so that said pedestal set can be formed.

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First Claim