[hpsdr] Help with DSP please

[richardh at iinet.net.au]

 A free (to download) book which is a good guide to theory is at :

http://dspguide.com/

Richard 

----- Original Message -----
From: "Alberto I2PHD" 
To:
Cc:
Sent:Sat, 10 Aug 2013 23:29:46 +0200
Subject:Re: [hpsdr] Help with DSP please

On 8/10/2013 9:24 PM, Bob Cowdery wrote:

	* _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(?). _

_ _ _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._ _ _ _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._ _
_ _ _ 

	_Any pointers appreciated._  
 Bob,

    a detailed answer would take many pages and hours to write it
down.
 What I can warmly suggest you is this really excellent book, where
all of your questions above 
 are answered in a clear and tutorial way :

http://www.amazon.com/Understanding-Digital-Signal-Processing-Edition/dp/0137027419
[1]

 I have it and I am very glad that a friend a few years ago pointed me
to it.

-- 
_73 ALBERTO I2PHD_  

Links:
------
[1]
http://www.amazon.com/Understanding-Digital-Signal-Processing-Edition/dp/0137027419

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