参数资料
型号: TVP5031PFP
厂商: TEXAS INSTRUMENTS INC
元件分类: 颜色信号转换
英文描述: COLOR SIGNAL DECODER, PQFP80
封装: POWER, PLASTIC, TQFP-80
文件页数: 14/92页
文件大小: 415K
代理商: TVP5031PFP
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
Accumulator
3-Line
Adaptive
Comb
Filter
Color
LPF
Notch
Filter
Notch
Filter
Notch
Filter
To
Sync Block
Delay
Contrast
Brightness
Saturation
Control
Delay
V
Y
U
UV
Y
Burst
Accumulator
Figure 2–4. Y/C Separation Block Diagram
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