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The Steven Smith book was originally published in 1987, so some things in
it are out of date. The mathematical theory of DSP is still sound; so far
as I know, there have been no revolutionary changes in the intervening
years. There are probably some new computational shortcuts that have been
developed since 1987. Using parallel processing is not addressed at all, as
it was still a dream of most engineers at the time. (It was already a
limited reality in supercomputing: mainframe CPUs with vector capabilities
such as the Cray 1 and its successors, and experimental massively parallel
systems like the Connection Machine.)

The comments on the performance levels of DSP on personal computers are
woefully out of date. An AVR microcontroller, such as found in a classic
Arduino board or a QCX, is probably about on a par with an original IBM PC.
(The AVR executes instructions significantly faster, but loses the
advantage back by being only an 8 bit processor.) A high end
microcontroller based on a Cortex-M7 (such as in the Teensy 4.0 and 4.1) is
at least three orders of magnitude faster at doing DSP. (32 bits, hardware
floating point, dual instruction issue, and higher clock speed.) The
processors in your smartphone and computer are faster still. And if you
REALLY need a bludgeon and your computing algorithm can exploit its massive
parallel calculation abilities, a modern graphics card obliterates all of
those, achieving gigaflops speeds.

On Sat, Sep 26, 2020 at 10:57 AM Jerry Gaffke via groups.io <jgaffke=
[email protected]> wrote:

The Steven Smith DSP book is also featured on his personal website, along
with other resources:


Browsing the analog.com website, there are plenty of other books
available that look interesting
Here's one that seems especially interesting, free as a pdf:



Analog acquired Linear Technology in 2017, so now holds the keys to
LTSpice, still free to use.
My favorite simulator (though I am by no means an expert), can take in
arbitrary Spice models.
A MSWin program, but runs fine under Wine on Linux.
I'm still using LTSpice-IV, the old WinXP version.




Jerry, KE7ER


On Sat, Sep 26, 2020 at 07:27 AM, Jerry Gaffke wrote:

Christian,

That's quite interesting.
Having started on the path by using John's instructions to look at some

cables

here,
I'm now quite curious what else can be done with Fourier Transforms on

the

nanovna.

This may be the nudge I need to complete the Steven Smith book on Digital
Signal Processing.
Perhaps in a couple months when the foul weather hits and I can't work
outside.
Got about halfway through last year when I was down with a bad back, but

will

have to
re-read and take some good notes as there is a lot of information to

digest.

The book is highly recommended, a relatively easy introduction to the

nuts and

bolts
of how this sort of thing gets coded. And legally available as a pdf:

My forum posts are usually not quite so grumpy as in that first reply to

you.

In the future, will remember to have a cup of coffee before posting.

Jerry, KE7ER