| 摘要 |
Apparatus and method for establishing the proper signal levels for exciting the red, green, and blue inputs to a picture tube in a color television receiver are described. An R. F. signal for producing illumination of a limited portion of a color picture tube face is supplied to the color television receiver. Another signal, from the apparatus, is connected to the video amplifier of the receiver to maintain the picture tube light output level constant at one or the other of two predetermined levels. A plurality of photo diodes, color filters, and electrical circuits are used to monitor the level of red, green, and blue light produced in response to the signal. The proper color temperature is realized by adjusting the gainof the R, G, and B amplifiers while monitoring the respective levels of green, red and blue light produced by the picture tube.
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