TVP5031 datasheet(21/85 Pages) TI

21 / 85 page

2–5

2.2.2

Y/C Separation

Figure 2–4 illustrates the luminance/chrominance (Y/C) separation process in the TVP5031. The 9-bit composite

video is multiplied by subcarrier signals in the quadrature demodulator to generate color difference signals U and V.

U and V are then low-pass filtered to achieve the desired bandwidth. An adaptive 3-line comb filter separates UV from

Y based on the unique property of color phase shift from line to line. Chroma is remodulated through a quadrature

modulator and subtracted from line-delayed composite video to generate luma. This form of Y/C separation is

completely complementary, thus there is no loss of information. However in some applications, it is desirable to limit

the U/V bandwidth to avoid crosstalk. In that case, notch filters can be turned on. To accommodate some viewing

preferences, a peaking filter is also available in the luma path. Contrast, brightness, hue, and saturation are

programmable.

Line

Delay

TVP5031 Y/C SEPARATION

–

Peaking

Quadrature

Modulation

Composite

Quadrature

Demodulation

Subcarrier

Generation

Notch

Filter

Color

LPF

Burst

Accum

3-Line

Adaptive

Comb

Filter

Color

LPF

Burst

Accum

Notch

Filter

Notch

Filter

Notch

Filter

Sync Block

Delay

Contrast

Brightness

Saturation

Control

Delay

Figure 2–4. Y/C Separation Block Diagram

TVP5031 Datasheet(PDF) 21 Page - Texas Instruments

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