[hpsdr] FIR filtering and HPSDR

[Erik Anderson]

ack, links.

with pictures: http://www.cs.ust.hk/mjg_lib/bibs/DPSu/DPSu.Files/Ga95.PDF

without pictures:
http://alumni.media.mit.edu/~adamb/docs/ConvolutionPaper.pdf

On Tue, Sep 9, 2014 at 9:59 AM, Erik Anderson <erikba at odysseus.anderson.name
> wrote:

> A random article I ran into yesterday seems like it would have value here,
> it is focused on "zero-latency convolution" and uses a hybrid of
> convolution and FFT calculations.  It talks about overlap-keep, but if you
> ignore all references to ho it also is creating an arbitrary-latency FFT
> computation by disassembling a "decimate-by-frequency" FFT formula and
> precomputing/reusing as many of the calculations as possible.
>
> I haven't fully parsed everything in here yet, but I do have two questions:
>
> (*) Would this approach have any value in say the Jetson board people have
> been talking about?  It could be used to create a heck of a lot of
> overlapped FFT results.
>
> (*) How come there is no mention of window functions in here?  They seem
> rather important for getting good outputs, but as soon as we start
> tinkering with the inputs they no longer exist as even something to
> struggle with.
>
> Erik KM2G
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20140909/710898d1/attachment-0003.htm>