Re: 400 Mb/s ADC

Jeff Peterson wrote:
>> 1. Just capturing the data performing some operation on it, storing
>> the results and throwing away the sample
>
> we accumualte averages (of cross products of fourier tranforms)
>

So the basic problem is getting 400MB/s of data into memory and processing
it, but are you reading 400MB every second, or sampling say once every ten
seconds. If it's every second, then you've got a bigger problem because I'd
be surprised if you can process it fast enough to get the job done before
the next sample comes along.

>>
>> 2. You might be actually planning to capture to disk 400MB/s for a
>> sustained period which has some pretty hairy implications for
>> storage capacity.
>>
> we wont store the raw data, just a very much reduced set.

So disk output bandwidth is not going to be a problem, what you are looking
for is a way of getting 400MB/s of data into memory for post-processing,
correct. Is it possible to break-up the input stream, so for example instead
of reading a single stream of 400MB/s, you've five devices reading 80MB/s in
parralel? Is the design of the device capturing the data set in stone or can
it be "parrallelized" if so it would make the problem much simpler and any
solution more scalable and less expensive.


-- 
Nik Simpson