Color TV receiver using quadrature-phase synchronous detector fo

Details Color TV receiver using quadrature-phase synchronous detector fo Color TV receiver using quadrature-phase synchronous detector fo

1994-11-04

1995-10-10

Groody, James J.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348618, 348727, H04N 5213

Patent

active

054575001

ABSTRACT:
In a television system including a source of an intermediate frequency (IF) signal, which signal includes an IF picture carrier amplitude modulated with video information, synchronous demodulator means responds to the IF signal, for providing an in-phase first output video signal that has both luminance and chrominance components, and for providing a quadrature-phase second output video signal that has a chrominance component but substantially no luminance component. Chroma circuitry is responsive to the quadrature-phase second output video signal for generating first and second color-difference signals.

REFERENCES:
patent: 4689695 (1987-08-01), Urata
patent: 4821120 (1989-04-01), Tomlinson
patent: 4870480 (1989-09-01), Chao
patent: 4920425 (1990-04-01), Sekimoto et al.
patent: 5075774 (1991-12-01), Gibson et al.
patent: 5369445 (1994-11-01), Harford

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