Hue correction for a chroma channel

Claim 2

In a color television receiver having an image reproduction device and a chroma channel whIch develops three color signals, the improvement comprising: three color stages corresponding to a red output stage, a green output stage, and a blue output stage for coupling the three color signals to the image reproduction device, switchable feedback means coupled to the green output stage for selectively altering the green output signal therefrom, including gain control means for altering the gain of said green output stage, and a switchable device responsive to a predetermined combination of color signals which indicate a green hue is to be reproduced for enabling the gain control means.

Claim 3

The improvement of claim 1 including further feedback means coupled to the red and blue output stages for altering the red and blue output signals in response to color signals occurring in the second and fourth quadrants of a color vector diagram.

Claim 4

In a color television receiver having an image reproduction device and a chroma channel which develops three color signals, the improvement comprising: three color stages each including an active semiconductor device having first and second electrodes and a control electrode, means respectively coupling the control electrodes to the three color signals, means coupling the first electrodes to the image reproduction device, switchable feedback means coupled to the second electrode of one of the three color stages for selectively altering a color output signal therefrom, including gain control means for altering the gain of said one color stage, and a switchable device responsive to a predetermined combination of color signals for enabling the gain control means.

Claim 5

In a color television receiver having an image reproduction device and a chroma channel which develops three color signals, the improvement comprising: three color stages each including an active semiconductor device having first and second electrodes and a control electrode, means respectively coupling the control electrodes to the three color signals, means coupling the first electrodes to the image reproduction device, switchable feedback means coupled to the second electrode of one of the three color stages for selectively altering a color output signal therefrom, including gain control means for altering the gain of said one color stage, and a switchable device responsive to a predetermined combination of color signals for enabling the gain control means.

Claim 6

The improvement of claim 3 including further feedback means coupled between the second electrodes of the remaining color stages for altering the output thereof.

Claim 7

The improvement of claim 4 wherein said active device comprises transistors having collector and emitter electrodes corresponding respectively to said first and second electrodes and a base electrode corresponding to said control electrode, said switchable feedback means comprises resistive means corresponding to said gain control means and diode means corresponding to said switchable device, said resistive means and diode means being in series between the emitter electrode of said one output stage and further resistive means coupled to the emitter electrodes of the remaining stages, said further resistive means corresponding to said further feedback means.

Claim 8

In a color television receiver having an image reproduction device and a chroma channel which develops three color signals, the improvement comprising: three color stages each including a transistor having first, second and base electrodes, means individually coupling the base electrodes to the three color signals, means individually coupling the first electrodes to the image reproduction device, a common feedback line, switchable feedback means located between the second electrode of said one output stage and the common feedback line for selectively altering a color output signal therefrom, including gain control means for altering the gain of said one color stage, a switchable device responsive to a predetermined combination of color signals for enabling the gain control means, and impedance means for coupling the second electrodes of the remaining color output stages to the common feedback line.

Claim 9

In a color television receiver having an image reproduction device and a chroma channel which develops three color signals, the improvement comprising: three color stages each including a transistor having first, second and base electrodes, means individually coupling the base electrodes to the three color signals, means individually coupling the first electrodes to the image reproduction device, a common feedback line, switchable feedback means located between the second electrode of said one output stage and the common feedback line for selectively altering a color output signal therefrom, including gain control means for altering the gain of said one color stage, a switchable device responsive to a predetermined combination of color signals for enabling the gain control means, and impedance means for coupling the second electrodes of the remaining color output stages to the common feedback line.

Claim 10

The improvement of claim 6 wherein said switchable feedback means includes first resistive means corresponding to said switchable device, said first resistive means and said diode being in series between the second electrode of said one color output stage and said common feedback line.

Claim 11

The improvement of claim 7 wherein said impedance means comprises second and third resistive means coupled between the second electrodes of the remaining color output stages and said common feedback line.