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<div class="moz-cite-prefix">Hi Alberto,<br>
<br>
Yes I also have it and it helps but I'm not smart enough to be
able to take the leap from the text to code without a bit of help.<br>
<br>
Bob<br>
<br>
On 10/08/2013 22:29, Alberto I2PHD wrote:<br>
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<blockquote cite="mid:5206B0CA.1090206@weaksignals.com" type="cite">
<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
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<div class="moz-cite-prefix">On 8/10/2013 9:24 PM, Bob Cowdery
wrote:<br>
<br>
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<blockquote cite="mid:5206936A.5030202@bobcowdery.plus.com"
type="cite">
<ol>
<li><i>Is there a write up at a block level of SharpDSP
because I'm not sure why blocks are ordered as they are.
The purpose of most is obvious but I'm a bit confused by
the oscillator block which I guess is converting to
baseband(?). </i><i><br>
</i> </li>
<i> </i>
<li><i>Demodulation is something I don't fully get. I believe
the convolution directly demodulates CW/SSB (and from what
I remember can convert to baseband as well) but for other
modes demod is tacked on the end of the processing.</i></li>
<i> </i>
<li><i>When doing the overlap/add method of fast convolution I
don't know how one calculates how big the FFT should be
or how many taps the filter should have in relation to
the sample block size and what the effect of the choice
is. Should a small block size (for reduced latency) have a
smaller FFT? I've not found a really good algorithm that
explains this and many I found seem to differ in approach
so I'm not clear on the correct implementation.</i></li>
<i> </i>
</ol>
<i> </i>
<p><i>Any pointers appreciated.</i></p>
</blockquote>
<br>
Bob,<br>
<br>
a detailed answer would take many pages and hours to write it
down.<br>
What I can warmly suggest you is this really excellent book, where
all of your questions above <br>
are answered in a clear and tutorial way :<br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www.amazon.com/Understanding-Digital-Signal-Processing-Edition/dp/0137027419">http://www.amazon.com/Understanding-Digital-Signal-Processing-Edition/dp/0137027419</a><br>
<br>
I have it and I am very glad that a friend a few years ago pointed
me to it.<br>
<br>
<br>
<div class="moz-signature">-- <br>
<i><b>73 Alberto I2PHD</b></i> </div>
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