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參數資料

型號：	ADV7300AKST
廠商：	ANALOG DEVICES INC
元件分類：	顏色信號轉換
英文描述：	Multiformat SD, Progressive Scan/HDTV Video Encoder with Six NSV⑩ 12-Bit DACs
中文描述：	COLOR SIGNAL ENCODER, PQFP64
封裝：	PLASTIC, MS-026BCD, LQFP-64
文件頁數：	47/68頁
文件大小：	1544K
代理商：	ADV7300AKST

REV. A

ADV7300A/ADV7301A

–47–

Table XXI. Adaptive Filter Control on Step Input Signal

Address

00h

01h

02h

10h

11h

15h

20h

38h

39h

3Ah

3Bh

3Ch

3Dh

FCh

38h

20h

00h

81h

80h

00h

ACh

9Ah

88h

28h

3Fh

64h

All other register settings are 00h.

When changing the Adaptive Filter Mode to Mode B

[Address 15h, Bit 6], the output in Figure 67 can be obtained.

: 674mV

@: 446mV

: 332ns

@: 12.8ms

Figure 67. Output Signal from Adaptive Filter Control

The adaptive filter control can also be demonstrated using the

internally generated crosshatch test pattern and toggling the Adap-

tive Filter Control Bit [Address 15h, Bit 7], shown in Table XXII.

Table XXII. Adaptive Filter Control on Internal Test Pattern

Address

00h

01h

02h

10h

11h

15h

20h

38h

39h

3Ah

3Bh

3Ch

3Dh

FCh

38h

20h

00h

85h

80h

00h

ACh

9Ah

88h

28h

3Fh

64h

SD DIGITAL NOISE REDUCTION

[Subaddresses 63h, 64h, and 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 Sharpness 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 identified as a valid signal, a fraction of the signal

(coring gain border, coring gain data) will be added to the origi-

nal signal in order to boost high frequency components and to

sharpen the video image.

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

in blocks of 8

8 pixels for MPEG2 systems or 16

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 pos-

sible to define this area to contain four pixels (border 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.)

16 pixels for

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