| 摘要 |
A gamma correction circuit to adjust the output of a video signal to the particular picture tube used including an exponential impedance changing element for gamma-correcting a non-gamma corrected input signal to produce a gamma-corrected signal. A current adder circuit adds the gamma-corrected signal to the non-gamma corrected input signal and includes a double balance type adder coupled to a series arrangement of variable and fixed DC voltage sources. The adder circuit has a combination of resistance means to add the gamma-corrected signal to the non-gamma corrected input signal at the desired adding ratio, while maintaining the signal levels of the gamma-corrected signal and the non-gamma corrected input signal coincident.
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