参数资料
| 型号： | ADV611JSTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 45/46页 |
| 文件大小： | 0K |
| 描述： | IC CCTV DGTL VIDEO CODEC 120LQFP |
| 标准包装： | 1 |
| 类型： | 视频编解码器 |
| 数据接口： | 串行 |
| 分辨率（位）： | 8 b |
| 三角积分调变： | 无 |
| 电压 - 电源，数字： | 4.5 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 120-LQFP |
| 供应商设备封装： | 120-LQFP（14x14） |
| 包装： | 托盘 |
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ADV611/ADV612
–8–
REV. 0
41
38
35
32
26
23
29
20
17
14
8
5
11
2
Cr COMPONENT
LOW
HIGH
QUANTIZATION OF MALLAT BLOCKS
39
36
33
30
24
21
27
18
15
12
6
3
9
0
Y COMPONENT
40
37
34
31
25
22
28
19
16
13
7
4
10
1
Cb COMPONENT
Figure 10. Typical Quantization of Mallat Data Blocks (Graphed)
THE PROGRAMMABLE QUANTIZER
This block quantizes the filtered image based on the response
profile of the human visual system. In general, the human eye
cannot resolve high frequencies in images to the same level of
accuracy as lower frequencies. Through intelligent “quantiza-
tion” of information contained within the filtered image, the
ADV611/ADV612 achieves compression without compromising
the visual quality of the image. Figure 9 shows the encode and
decode data formats used by the quantizer.
Figure 10 shows how a typical quantization pattern applies over
Mallat block data. The high frequency blocks receive much
larger quantization (appear darker) than the low frequency
blocks (appear lighter). Looking at this figure, one sees some key
point concerning quantization: (1) quantization relates directly
to frequency in Mallat block data and (2) levels of quantization
range widely from high to low frequency block. (Note that the
fill is based on a log formula.) The relation between actual
ADV611/ADV612 bin width factors and the Mallat block fill
pattern in Figure 10 appears in Table III.
9.7
WAVELET
DATA
6.10
1/BW
15.17 DATA
0.5
15.0 BIN
NUMBER
QUANTIZER - ENCODE MODE
TRNC
SIGNED
UNSIGNED
1/BW
QUANTIZER - DECODE MODE
8.8 BW
23.8
DE-QUANTIZED
WAVELET DATA
9.7
WAVELET
DATA
15.0 BIN
NUMBER
SIGNED
UNSIGNED
BW
SAT
Figure 9. Programmable Quantizer Data Flow
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADV611JSTZ | 制造商:Analog Devices 功能描述:IC VIDEO CODEC |
| ADV612 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Closed Circuit TV Digital Video Codec |
| ADV612BST | 制造商:Analog Devices 功能描述:Video Compression 120-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:INDUSTRIAL GRADE CCTV DIGITAL VID CODEC - Tape and Reel |
| ADV65056509 | 制造商:LG Corporation 功能描述:Frame Assembly |
| ADV65909302 | 制造商:LG Corporation 功能描述:Frame Assembly |
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