[Elecraft] SDR filter improvement

[William Abernathy]

Hal,
Thanks. I think the book is probably over my head. 

I do hope for more improvements. Still can hear the QRM ringing in my head after Field Day

73

William Abernathy


> 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 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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>