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參數(shù)資料
| 型號(hào)： | saturate |
| 廠商： | Altera Corporation |
| 英文描述： | Data Word Saturator(數(shù)值數(shù)字飽和器) |
| 中文描述： | 數(shù)據(jù)字飽和（數(shù)值數(shù)字飽和器） |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 164K |
| 代理商： | SATURATE |
Altera Corporation
3
FS 6: saturate Data Word Saturator
Figure 2
is a simplified illustration of an 8-bit color channel in a digital
video system. In this example, color space conversion is performed using
the
YCrCb2RGB
function. Depending on the input values to the
function, the multiplication used in the color conversion may result in a
17-bit data word that rolls over. (For an example of data word roll over,
see Figure 4.) To avoid data word roll over, this 17-bit digital video signal
is fed to the
saturate
function, where it is saturated to a 16-bit word. The
signal is then fed to the
round
function, where it is rounded to an 8-bit
word. At this point, the data word is ready for conversion to an analog
video signal.
YCrCb2RGB
Figure 2. Digital Video Channel
The following figures show examples of the 17-bit digital video signal,
using signed representation, as it is processed down to an 16-bit signal.
Figure 3
shows the sine wave of the signal before saturation.
Figure 3. Sine Wave of 17-Bit Data Word
If a technique is not used to decrease the number of significant bits, data
word roll over will occur.
Figure 4
shows the effect on the signal as the
data word rolls over, i.e., as the signal passes 32767, it shifts from positive
full-scale operation to negative full-scale operation, and vice versa as it
passes –32768. The output of this example can be catastrophic in many
systems.
Analog
Video
Signa
l
D/A
Converter
Round
Function
Saturate
Function
YCrCb2RGB
Function
17
8
8
8
16
8
y
cr
cb
17-Bit Data Word
65535
–65536
16-Bit Data Word
0
32767
–32768
Signal
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