g****r
发帖数: 12 | 1 My project may need to use one of DSP/microcontroller/FPGA chip, and I
wonder if you can give me some comments:
The application is to sample two analog channels, do A/D conversion, then do
FFT to the sampled real time signals. Basically, the signal will be sampled
every 0.027 second, and FFT is needed for 512 samples. The optimal goal is,
to do FFT once every new sample point arrives, which means to do FFT every
0.027 second. But I guess that might be difficult, so we can actually do fft
after s | o*******m
发帖数: 154 | 2 完全可以用FPGA啊，OPENCORE.ORG里面有几个sample project | j***j
发帖数: 324 | 3 这么低得采样频率，FPGA ＆ DSP 都可以很轻松得完成。
用dsp 会更简单一些，因为可以直接用c 编程，做计算更容易。
用FPGA 更efficient 而且可以速度更快，但你这个速度根本不需要更快得速度。
do
sampled
is,
every
fft
immplement
【在 g****r 的大作中提到】
: My project may need to use one of DSP/microcontroller/FPGA chip, and I
: wonder if you can give me some comments:
: The application is to sample two analog channels, do A/D conversion, then do
: FFT to the sampled real time signals. Basically, the signal will be sampled
: every 0.027 second, and FFT is needed for 512 samples. The optimal goal is,
: to do FFT once every new sample point arrives, which means to do FFT every
: 0.027 second. But I guess that might be difficult, so we can actually do fft
: after s
| g****r
发帖数: 12 | 4 每0.027秒做一次512点的fft，用100MHz的单片机好实现吗？
【在 o*******m 的大作中提到】
: 完全可以用FPGA啊，OPENCORE.ORG里面有几个sample project
| m******k
发帖数: 183 | 5 数据精度也有关系。
dsp专门用来做fft这些运算，速度应该比同频fpga或者microcontroller的快一些。
32bit已经做的很快了。除非你想把算法用硬件实现，fpga肯定是最快的。不过你的速
度要求不是那么高，如果精度不是很高的话。
do
sampled
is,
every
fft
immplement
【在 g****r 的大作中提到】
: My project may need to use one of DSP/microcontroller/FPGA chip, and I
: wonder if you can give me some comments:
: The application is to sample two analog channels, do A/D conversion, then do
: FFT to the sampled real time signals. Basically, the signal will be sampled
: every 0.027 second, and FFT is needed for 512 samples. The optimal goal is,
: to do FFT once every new sample point arrives, which means to do FFT every
: 0.027 second. But I guess that might be difficult, so we can actually do fft
: after s
| a****y
发帖数: 255 | 6 dsPIC from Microchip.
never use these dsPICs, though |
|
