H - Electricity – 04 – N
Patent
H - Electricity
04
N
330/38, 350/73
H04N 9/12 (2006.01) H03G 1/00 (2006.01) H04N 5/58 (2006.01) H04N 9/64 (2006.01)
Patent
CA 1066401
Abstract of the Invention In a color television receiver, first and second amplifiers are respectively included in the luminance and chrominance channels to permit control of contrast and saturation. The amplifiers have gain versus control voltage characteristics including linear portions extrapolated to cut off at predetermined voltages which may or may not be the same. A first potentiometer is coupled between a source of fixed voltage equal to the extrapolated cut off voltage of the first amplifier and a gain controlling voltage source. The gain controlling voltage may be produced by a circuit including an element responsive to ambient light. The wiper of the first potentiometer is coupled to the first amplifier to couple a voltage developed at a predetermined point of the first potentiometer to the first amplifier to control its gain. A second potentiometer is coupled between a source of voltage equal to the extrapolated cut off voltage of the second amplifier and the gain control- ling voltage source to receive a portion of the gain controlling voltage in accordance with the ratio of the extrapolated cut off voltages of the first and second amplifiers. The wiper of the second potentiometer is coupled to the second amplifier to couple a voltage developed at a predetermined point of the second potentio- meter to the second amplifier to control its gain. In this manner, the contrast of the receiver may be varied over a relatively wide range while saturation is main- tained substantially constant.
252914
Avins Jack
Yorkanis Bernard J.
LandOfFree
Gain control arrangement useful in a television signal... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gain control arrangement useful in a television signal..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gain control arrangement useful in a television signal... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-16704