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參數(shù)資料
| 型號： | fft_on_chip |
| 廠商： | Altera Corporation |
| 英文描述： | Fast Fourier Transform(傅立葉變換) |
| 中文描述： | 快速傅里葉變換（傅立葉變換） |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 155K |
| 代理商： | FFT_ON_CHIP |
Altera Corporation
3
FS 5: round Data Word Rounder
Functional
Description
The
parameterized input and output widths.
round
function implements a data word rounder that provides
The
WIDTHR
the output width. The
another
WIDTHR
round
function performs the following calculation:
round
function rounds a
-bit number, where
WIDTHI
WIDTHI
function can also add the rounded result to
bit-wide number without increasing logic usage. The
-bit number down to a
is the input width and
WIDTHR
is
round
-
result[(WIDTHR–1)..0]
dataa[WIDTHI-WIDTHR–1]
=
dataa[(WIDTHI–1)..(WIDTHI-WIDTHR)]
+
datab[]
+
For example, if the number being rounded is 00101.011
B
rounded down to 00101
B
because the fractional part of the number (i.e.,
the bits to the right of the binary point) is less than 0.5 (0.100
B
bit directly to the right of the binary point is 1, a 1 is added to the result
because the fractional part of the number is greater than 0.5 (0.100
B
, the number is
). When the
).
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
YCrCb2RGB
function, the multiplication used in the color conversion may
result in a 17-bit data word that rolls over. To avoid data word roll over,
this 17-bit digital video signal is fed to the
saturated to a 16-bit word. The signal is then fed to the
where it is rounded to an 8-bit word. At this point, the data word is ready
for conversion to an analog video signal.
saturate
function, where it is
round
function,
Figure 2. Digital Video Channel
f
For information on saturation, refer to
Functional Specification 6 (saturate
Data Word Saturator)
. For information on color space conversion, refer to
RGB2YCrCb & YCrCb2RGB Color Space Converters Data Sheet
.
Analog
Video
Signa
l
D/A
Converter
Round
Function
Saturate
Function
YCrCb2RGB
Function
17
8
8
8
16
8
y
cr
cb
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