VDP313XY datasheet(16/76 Pages) MICRONAS

16 / 76 page

VDP 313xY

ADVANCE INFORMATION

Micronas

2.10.3.Dynamic Peaking

Especially with decoded composite signals and notch

filter luminance separation, as input signals, it is nec-

essary to improve the luminance frequency character-

istics. With transparent, high-bandwidth signals, it is

sometimes desirable to soften the image.

the

VDP 313xY,

the

luminance

response

improved by dynamic peaking. The algorithm has been

optimized regarding step and frequency response. It

adapts to the amplitude of the high frequency part.

Small AC amplitudes are processed, while large AC

amplitudes stay nearly unmodified.

The dynamic range can be adjusted from

−14 to

+14 dB for small high frequency signals. There is sep-

arate adjustment for signal overshoot and for signal

undershoot. For large signals, the dynamic range is

limited by a non-linear function that does not create

any visible alias components. The peaking can be

switched over to “softening” by inverting the peaking

term by software.

The center frequency of the peaking filter is switchable

from 2.5 MHz to 3.2 MHz. For S-VHS and notch filter

color decoding, the total system frequency responses

for both PAL and NTSC are shown in Fig. 2–13.

Transients, produced by the dynamic peaking when

switching to the picture frame can be suppressed

optionally

Fig. 2–12: Dynamic peaking frequency response

Fig. 2–13: Total frequency response for peaking filter and S-VHS, PAL, NTSC

MHz

–5

–10

–15

–20

MHz

−5

−10

−15

−20

MHz

−5

−10

−15

−20

MHz

−5

−10

−15

−20

MHz

−5

−10

−15

−20

MHz

−5

−10

−15

−20

MHz

−5

−10

−15

−20

CF=2.5 MHz

CF=3.2 MHz

NTSC

PAL/SECAM

S-VHS

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