Datasheet

Peak
Detector
Bandpass
Filter
Peaking
Filter
Delay
IN
Gain
OUT
+
x
TVP5158, TVP5157, TVP5156
www.ti.com SLES243G –JULY 2009–REVISED APRIL 2013
Figure 3-6. Chroma Trap Filter Frequency Response, NTSC ITU-R BT.601 Sampling
Figure 3-7. Chroma Trap Filter Frequency Response, PAL ITU-R BT.601 Sampling
3.2.4 Luminance Processing
The digitized composite video signal passes through either a luminance comb filter or a chroma trap filter,
either of which removes chrominance information from the composite signal to generate a luminance
signal. The luminance signal is then fed into the input of a peaking circuit. Figure 3-8 shows the basic
functions of the luminance data path. A peaking filter (edge enhancer) amplifies high-frequency
components of the luminance signal. Figure 3-9 shows the characteristics of the peaking filter at four
different gain settings that are user-programmable via the I
2
C interface.
Figure 3-8. Luminance Edge-Enhancer Peaking Block Diagram
Copyright © 2009–2013, Texas Instruments Incorporated Functional Description 19
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