Abstract In one embodiment of the invention described herein, synchronous blue and red color carrier correction signals of proper phase are developed from an encoded color television signal. The carrier signals have introduced therein fixed increments of correction to produce thereby blue and red black level correction signals. The signals are also supplied to a set of modulator circuits wherein the signals are modulated by decoded blue and red color component signals. The resulting gain control signals, which have amplitudes proportional to the instantaneous amplitudes of the decoded signals, are also corrected in increments. Furthermore, the signals are supplied to another set of modulator circuits wherein the signals are modulated by signals comprising the differences between gamma corrected and linear decoded blue and red color component signals. The resulting gamma correction signals have introduced therein fixed increments of correction and are thereafter combined with the color black level and gain control signals and added to the encoded color television signal.
Apparatus for correcting input encoded color television signals which includes a color reference hase signal comprising: means for decoding said encoded color television signals to produce decoded primary color component signals; means for generating primary color correction signals which are in a phased relationship with the color reference phase signal of said encoded color television signals; means responsive to said decoded color component signals for encoding said correction signals; and means for adding said encoded correction signals to said input encoded color television signals to produce corrected output color encoded color television signal.
Claim 2
Dependent Claim
93 words
Apparatus for correcting input encoded color television signals which includes a color reference hase signal comprising: means for decoding said encoded color television signals to produce decoded primary color component signals; means for generating primary color correction signals which are in a phased relationship with the color reference phase signal of said encoded color television signals; means responsive to said decoded color component signals for encoding said correction signals; and means for adding said encoded correction signals to said input encoded color television signals to produce corrected output color encoded color television signal.
Claim 3
Dependent Claim
19 words
Apparatus as defined by claim 1 wherein said means for encoding said correction signals comprise a plurality of modulators.
Claim 4
Dependent Claim
51 words
Apparatus as defined by claim 2 wherein said plurality of modulators is responsive to at least two decoded primary color component signals and to at least two primary color correction signals for varying the amplitudes of said correction signals in proportion to the instantaneous amplitudes of the primary color component signals.
Claim 5
Dependent Claim
84 words
Apparatus as defined by claim 3 further comprising a plurality of gamma correction means responsive to at least two decoded primary color component signals for providing difference signals representative of the difference between linear and nonlinear reproductions of said decoded primary color component signals, and a plurality of modulator means responsive to the difference signals and to at least two primary color correction signals for varying the amplitudes of the primary color correction signals in proportion to the instantaneous amplitudes of the difference signals.