[hpsdr] FFT latency

[Roger Rehr W3SZ]

Hi David,

Thanks for the very necessary correction!  It doesn't matter how many 
times I proof my text...something seems to always slip through...a 
lifelong annoyance :(

Good thing no lives depended on my verbal/expository skills when I was 
working :)

Dave is absolutely right, of course.  The point of my text was that T is 
1/bin size.  So there can't be any other variable in the equation when 
you are discussing the relationship between T and bin size.

I guess I should do some reading up on "minimal neuronal delay" and see 
if I can solve the  problem described in the first paragraph of this 
email.  Maybe I just need to do a reverse FFT on my speech/typing before 
sending it out.  Or figure out some type of convolutional forward error 
correction that I can apply to those communication modes...I know, the 
real DSP guys [I am not in that group] would say that wouldn't work for 
me... they would say "GIGO and no method of error correction can correct 
that"!

Again, thanks for picking that up, David!  And my apologies to the 
group.  Ignore the first sentence of the last paragraph of my prior 
email, or insert a "DO NOT" before "lead" there.  The rest of my prior 
email is OK.  Hopefully no new errors in this one :)

73,

Roger
W3SZ



On 4/5/2015 10:33 AM, David Bridgham wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> On 04/05/2015 10:06 AM, Roger Rehr W3SZ wrote:
>
>> Faster sampling rates lead to a smaller delay for a given frequency
>> bin width.
> I think you meant to say "Faster sampling rates DOES NOT lead to a
> smaller delay for a given frequency bin width".  Rather faster sampling
> rates with a given frequency bin width lead to more bins.
>
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