[hpsdr] Morse transcription project

[Rob Frohne]

On 12/05/2010 08:08 AM, Frank Brickle wrote:
> On Thu, Dec 2, 2010 at 3:25 PM, Chris Albertson
> <albertson.chris at gmail.com>  wrote:
>
>> ...
>> Why not do the work entirely in the frequency domain?    My theory for
>> doing this was that when an operator presses his key down he is in
>> effect creating a bit of a spike in the spectra of the band.  I did
>> not see much reason for ever taking the signals down to base band
> One big reason for going to baseband is that you can then also work on
> downsampled data.
>
> There are also certain kinds of things you might like to be able to
> do, which sort of need to be done in the time domain -- computing LPC
> coefficients, for example, or taking the wavelet transform.
>
> Also, you're up against Heisenberg uncertainty, which might or might
> not work at odds with the other kinds of analysis you're bringing to
> bear -- for example, probability models of delays between successive
> events in a causal vs. random signal.
>
> In short, probably better to be prepared to deal with signal on both
> sides (time and freq).
>
> 73
> Frank
> AB2KT
>
Frank is absolutely right.  You get wonderful benefits from looking at 
almost any signal processing problem from both the time and frequency 
coordinate systems.  Some things are easier to see or compute in each 
domain, and if you don't look in both coordinate systems, you will 
surely be missing an insight, or doing something inefficiently.

73,

Rob
KL7NA

-- 
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla University
100 SW 4th Street
College Place, WA 99324
(509) 527-2075			 http://people.wallawalla.edu/~rob.frohne

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