[Elecraft] SDR filter improvement

[Bill Coleman]

If you want to understand DSP, the math underlying it and a lot of the capabilities and limitations, I recommend this book:
http://www.dspguide.com/pdfbook.htm

It is freely available from that link. You’ll have to read it on-line. I did, and found it to be the most readable explanation of DSP I had ever seen.

> On Jun 30, 2021, at 10:44 PM, Hal Massey <haljr.massey at gmail.com> wrote:
> 
> Digital Signal Processing is a field all unto itself. They are definitely *not* emulating mechanical filters. If they were they would be ringing like a mechanical filter. A great text is, "Discrete-Time Signal Processing <https://www.amazon.com/Discrete-Time-Signal-Processing-3rd-Prentice-Hall/dp/0131988425/ref=as_li_ss_tl?ie=UTF8&qid=1489936960&sr=8-1&keywords=Discrete-Time+Signal+Processing+by+A.+V.+Oppenheim+and+R.+W.+Schafer&linkCode=ll1&tag=dspgsm0f-20&linkId=9273a86cec7d4d591dbb9d679bd2afb0> by A. V. Oppenheim and R. W. Schafer.
> 
> This is good news because we have not plumbed the depths of what can and can’t be done with DSP yet. 
> 
> 
>> On Jun 30, 2021, at 13:05, William Abernathy <wabernat at gmail.com> wrote:
>> 
>> Hi,
>> Seems that SDR radios have software emulation of mechanical filters like
>> noise reduction.  Do you think the future holds new filters written in
>> software?  I would like a subtraction filter that pulls out the guy 2 KC's
>> away.  Maybe the 2nd receiver could be tuned in on the station that needs
>> to be subtracted from the primary.
>> 
>> What do you think?
>> 
>> Wiliam
>> 
>> -- 
>> *William Abernathy*
>> *AA8XX at arrl.net <AA8XX at arrl.net>*
>> *AA8XX*
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Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
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