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參數資料

型號：	ADV7311
廠商：	Analog Devices, Inc.
英文描述：	Multiformat 216 MHz Video Encoder with Six NSV 12-Bit DACs
中文描述：	多格式視頻編碼器216兆赫六噪聲整形的12位DAC
文件頁數：	52/84頁
文件大小：	1099K
代理商：	ADV7311

REV. A

–52–

ADV7310/ADV7311

SD Digital Noise Reduction

[Subaddress 63h, 64h, 65h]

DNR is applied to the Y data only. A filter block selects the high

frequency, low amplitude components of the incoming signal

[DNR input select]. The absolute value of the filter output is

compared to a programmable threshold value ['DNR threshold

control]. There are two DNR modes available: DNR mode and

DNR sharpness mode.

In DNR mode, if the absolute value of the filter output is smaller

than the threshold, it is assumed to be noise. A programmable

amount [coring gain border, coring gain data] of this noise

signal will be subtracted from the original signal. In DNR sharp-

ness mode, if the absolute value of the filter output is less than

the programmed threshold, it is assumed to be noise, as before.

Otherwise, if the level exceeds the threshold, now being identi-

fied as a valid signal, a fraction of the signal [coring gain border,

coring gain data] will be added to the original signal in order to

boost high frequency components and sharpen the video image.

In MPEG systems, it is common to process the video information

in blocks of 8 pixels

8 pixels for MPEG2 systems, or 16 pixels

16 pixels for MPEG1 systems [block size control]. DNR can be

applied to the resulting block transition areas that are known to

contain noise. Generally, the block transition area contains two

pixels. It is possible to define this area to contain four pixels [bor-

der area].

It is also possible to compensate for variable block positioning

or differences in YCrCb pixel timing with the use of the [DNR

block offset].

The digital noise reduction registers are three 8-bit registers.

They are used to control the DNR processing.

BLOCK SIZE CONTROL

BORDER AREA

BLOCK OFFSET

CORING GAIN DATA

CORING GAIN BORDER

GAIN

DNR CONTROL

FILTER

OUTPUT

> THRESHOLD

INPUT FILTER

BLOCK

FILTER OUTPUT

< THRESHOLD

DNR OUT

MAIN SIGNAL PATH

ADD SIGNAL

ABOVE THRESHOLD

RANGE FROM

ORIGINAL SIGNAL

DNR

SHARPNESS

MODE

NOISE

SIGNAL PATH

Y DATA

INPUT