ADV7321 datasheet(59/88 Pages) AD

59 / 88 page

ADV7320/ADV7321

Rev. 0 | Page 59 of 88

FILTER C

FILTER B

FILTER A

FILTER D

FREQUENCY (Hz)

0.2

0.4

0.6

0.8

1.0

Figure 81. DNR Input Select

DNR MODE CONTROL

[Address 0x65, Bit 4]

This bit controls the DNR mode selected. Logic 0 selects DNR

mode; Logic 1 selects DNR sharpness mode.

DNR works on the principle of defining low amplitude, high

frequency signals as probable noise and subtracting this noise

from the original signal.

In DNR mode, it is possible to subtract a fraction of the signal

that lies below the set threshold, assumed to be noise, from the

original signal. The threshold is set in DNR Register 1.

When DNR sharpness mode is enabled, it is possible to add a

fraction of the signal that lies above the set threshold to the

original signal, since this data is assumed to be valid data and

not noise. The overall effect is that the signal will be boosted

(similar to using Extended SSAF filter).

BLOCK OFFSET CONTROL

[Address 0x65, Bits 7 to 4]

Four bits are assigned to this control, which allows a shift of the

data block of 15 pixels maximum. Consider the coring gain

positions fixed. The block offset shifts the data in steps of one

pixel such that the border coring gain factors can be applied at the

same position regardless of variations in input timing of the data.

SD ACTIVE VIDEO EDGE

[Subaddress 0x42, Bit 7]

When the active video edge feature is enabled, the first three

pixels and the last three pixels of the active video on the luma

channel are scaled so that maximum transitions on these pixels

are not possible. The scaling factors are ×1/8, ×1/2, and ×7/8.

All other active video passes through unprocessed.

SAV/EAV STEP EDGE CONTROL

The ADV7320/ADV7321 have the capability of controlling fast

rising and falling signals at the start and end of active video to

minimize ringing.

An algorithm monitors SAV and EAV and determines when the

edges are rising or falling too fast. The result is reduced ringing

at the start and end of active video for fast transitions.

Subaddress 0x42, Bit 7 = 1, enables this feature.

100 IRE

0 IRE

100 IRE

12.5 IRE

87.5 IRE

0 IRE

50 IRE

LUMA CHANNEL WITH

ACTIVE VIDEO EDGE

DISABLED

LUMA CHANNEL WITH

ACTIVE VIDEO EDGE

ENABLED

Figure 82. Example of Active Video Edge Functionality

ADV7321 Datasheet(PDF) 59 Page - Analog Devices

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