DDP3310B datasheet(7/60 Pages) MICRONAS

7 / 60 page

ADVANCE INFORMATION

DDP 3310B

Micronas

2.1.4. Dynamic Peaking

Especially with decoded composite signals and notch

filter luminance separation as input signals, it is neces-

sary to improve the luminance frequency characteris-

tics. With transparent high-bandwidth signals, it is

sometimes desirable to soften the image.

In the DDP 3310B, the luma frequency response is

improved by “dynamic” peaking. It adapts to the ampli-

tude and the frequency of the input signal. Small AC

amplitudes are sharpened while large AC amplitudes

remain 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 selectable

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

ter

color

decoding,

the

total

system

frequency

responses for both PAL and NTSC are shown in Fig.

2–1 and Fig. 2–2. (All frequencies refer to a 50/60-Hz

video signal).

Fig. 2–1: Dynamic peaking frequency response

Fig. 2–2: 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

CF= 3.2 MHz

CF= 2.5 MHz

S-VHS

MHz

-5

-10

-15

-20

MHz

-5

-10

-15

-20

CF= 3.2 MHz

CF= 2.5 MHz

PAL/SECAM

MHz

-5

-10

-15

-20

MHz

-5

-10

-15

-20

CF= 2.5 MHz

CF= 3.2 MHz

NTSC

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