Digital color generator

Details Digital color generator Digital color generator

H - Electricity

04

N

350/41

H04N 9/04 (2006.01) H04N 9/45 (2006.01)

Patent

CA 1191247

Abstract of the Disclosure The invention relates to a sinusoidal sub-carrier phase shifter for a television color generator. In accord- ance with the invention, the sinusoidal sub-carrier is first converted to a corresponding rectangular wave. The pulse width of the rectangular wave is then varied in accordance with a signal of varying amplitude, the ampli- tude of the signal corresponding with the desired phase shift. The pulse width is varied by an arrangement con- sisting of interconnected one shot multivibrators and operational amplifiers. The rectangular wave form is then converted to a square wave, and the square wave is, in turn, converted to a phase shifted sinusoidal wave. The phase shifter for a PAL system consists of two channels, one of the channels producing one of the PAL phases and the other channel producing the complementary PAL phase.

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