Digital color generator

Details Digital color generator Digital color generator

1982-10-15

1984-09-25

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 950

Patent

active

044738382

ABSTRACT:
The invention relates to a sinusoidal subcarrier phase shifter for a television color generator. In accordance with the invention, the sinusoidal subcarrier 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 amplitude of the signal corresponding with the desired phase shift. The pulse width is varied by an arrangement consisting 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.

REFERENCES:
patent: 4003078 (1977-01-01), Owen
patent: 4040086 (1977-08-01), Wellhausen et al.
patent: 4051520 (1977-09-01), Davidse et al.
patent: 4329710 (1982-05-01), Taylor

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