[hpsdr] Help with DSP please

[Bob Cowdery]

Hi Alberto,

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.

Bob

On 10/08/2013 22:29, Alberto I2PHD wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> On 8/10/2013 9:24 PM, Bob Cowdery wrote:
>
>>  1. /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(?). //
>>     /
>>  2. // /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./
>>  3. // /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
>
> I have it and I am very glad that a friend a few years ago pointed me
> to it.
>
>
> -- 
> /*73 Alberto I2PHD*/
>
>
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