[hpsdr] Help with DSP please
Bob Cowdery
bob at bobcowdery.plus.com
Sun Aug 11 01:56:04 PDT 2013
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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