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square wave harmonic theory (time domain)

D

Don Lancaster

Jan 1, 1970
0
Rich said:
The edges.

And, yes, counterintuitive as it might seem, all of the frequency
components are there all of the time - but because of the way they're
added together in phase, everyplace but at the rising and falling
edge, they add up to either +peak or -peak.

Imagine, say, five cars in a weird race:

They each have a different starting line, but they all have the same
finish line. Car A's starting line is at, say, 100 yards; car B's is
at 200 yds, car C at 300 yards, and so on.

Start them simultaneously, with car A going one MPH, car B going 2
MPH, car C going 3 MPH, and so on.

Nothing much happens until they all reach the finish line simultaneously,
where they all come together at the same time - Crash! - that would be
the rising edge of the square wave, where all of the harmonics converge
in phase.

That's one way to visualize it, anyway.

With the sine waves, it's not their speed but their phases that do the
trick; this is also why square waves have such a wide bandwidth.

Hope This Helps!
Rich
Detailed plots at http://tinaja.com/glib/muse90.pdf

also see http://www.tinaja.com/magsn01.asp


--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
P

Phil Allison

Jan 1, 1970
0
"Thomas Magma"


** You are one smartarse prick - Tom.

Perhaps I should have posted my question to a more reputable newsgroup, I
didn't realize there were kooks lerking in this one.


** The only "kook" in sight is YOU - ASSHOLE.

Steve was just trying to help me out.


** You dumb opinion does not count - FOOL.

Question askers do ** NOT ** get to decide who is right and who is not.

You wreck it for everyone Phil.


** You are one colossal jerk - Tom

Piss the hell off.



........ Phil
 
P

Phil Allison

Jan 1, 1970
0
"Don Blow it out his Arse Bowey"


( snip brain dead drivel)


** Look - nothing left.

As always from the Bowey bullshit artist.



......... Phil
 
P

Phil Allison

Jan 1, 1970
0
"Thomas Magma"


** You are a fucking ASS - Tom

You don't know and you don't wanna know.

Piss off.




........ Phil
 
P

Phil Allison

Jan 1, 1970
0
"Rich Grise"
Well, I just posted another post, but the point is, the components are, in
fact, there all of the time - it's the changing phase relationships over
time that make them add up to what looks like DC, for awhile, then the
opposite polarity of DC, for a while.


** Total BOLLOCKS.

Kill file the mentally retarded Grise FOOL NOW !!




......... Phil
 
P

Phil Allison

Jan 1, 1970
0
"John Larkin"
The "domains" are just ways of looking at exactly the same thing, a
square wave. If you really have a square wave, the harmonics are
present all the time, no matter how you think about them.


** More brain dead BOLLOCKS.

Classic grossly autistic engineer think.

Larkin sure as hell is an autistic.




........ Phil
 
P

Phil Allison

Jan 1, 1970
0
"Rich Grise"
And, yes, counterintuitive as it might seem, all of the frequency
components are there all of the time -


** It is not just counterintuitive - fuckwit.

It is a self delusion in the minds of fools who think the " frequency
domain" is a higher reality than the time domain.



........ Phil
 
J

John Larkin

Jan 1, 1970
0
"John Larkin"


** More brain dead BOLLOCKS.

Classic grossly autistic engineer think.

Larkin sure as hell is an autistic.

If you have anything sensible to say, then say it. *IF*

John
 
P

Phil Allison

Jan 1, 1970
0
"John Larkin"
The "domains" are just ways of looking at exactly the same thing, a
square wave. If you really have a square wave, the harmonics are
present all the time, no matter how you think about them.


** More brain dead BOLLOCKS !!

Classic, grossly autistic engineer think.

Larkin sure as hell is an autistic.

Plus he has the pig arrogance that accompanies it.



....... Phil
 
R

Rich Grise

Jan 1, 1970
0
I get your point, but it's tough when it's a response to your own thread.

It's like trying to close your ears.

That's what "plonking" is for - your newsreader might call it a "filter";
some people call it a "killfile".

If it's a real newsreader at all, it will have filters - just learn how to
use them.

Good Luck!
Rich
 
R

Rich Grise

Jan 1, 1970
0
Where there is no harmonic content whatsoever in the time domain.

This is your fundamental misunderstanding. All of the harmonics (well,
the appropriate ones) are there all of the time; with a perfect square
wave, the spectrum would go to infinity, literally. This is why there
is no such thing in real life as a "perfect" square wave.

Why are you blocking this information out? Did you look at the animation
at wiki? Or that graph I posted a link to?

It's not _that_ hard to grasp.

Thanks,
Rich
 
J

John Larkin

Jan 1, 1970
0
"John Larkin"



** More brain dead BOLLOCKS !!

Classic, grossly autistic engineer think.

Larkin sure as hell is an autistic.

Plus he has the pig arrogance that accompanies it.



...... Phil

As regards having anything useful to say, I'll take that for a "no."
Go fix a guitar amp or something.

John
 
J

John Larkin

Jan 1, 1970
0
I'm not sure if this is a good analogy to help answer the original
question...if you strike a bell, it will ring at the resonant frequency of
the bell structure and not generate harmonic frequencies relating to the
rate in which you strike it.

Actually, it will. If you strike it gently at a rate that's an integer
fraction of a major resonance, that resonance will build up in
amplitude over multiple strikes, much more than if the ratio is not
maintained. Of course, thet's not easy to do by hand; the frequency
and phasing have to be exact.

The bell is a bandpass filter.

John
 
D

Don Lancaster

Jan 1, 1970
0
Rich said:
This is your fundamental misunderstanding. All of the harmonics (well,
the appropriate ones) are there all of the time; with a perfect square
wave, the spectrum would go to infinity, literally. This is why there
is no such thing in real life as a "perfect" square wave.

Why are you blocking this information out? Did you look at the animation
at wiki? Or that graph I posted a link to?

It's not _that_ hard to grasp.

Thanks,
Rich

Actually, it is.

I've tried to explain it over and over and over again.

Especially to the free energy nuts who claim that pulsed dc is somehow
different from ac.


--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
P

Phil Allison

Jan 1, 1970
0
"John Larkin ASD Cretin "
The "domains" are just ways of looking at exactly the same thing, a
square wave. If you really have a square wave, the harmonics are
present all the time, no matter how you think about them.


** More brain dead BOLLOCKS !!

Classic, grossly autistic engineer think.

Larkin sure as hell is an autistic.

Plus he has the pig arrogance that accompanies it.




....... Phil
 
M

Michael A. Terrell

Jan 1, 1970
0
John said:
As regards having anything useful to say, I'll take that for a "no."
Go fix a guitar amp or something.

John


Broken toasters and sex toys are the limits of her skills.

Really, John you have to work hard for Phyllis to plonk you, but its
really worth it. If it only worked for 'flat bastard' as well. :(


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
D

Don Bowey

Jan 1, 1970
0
"Don Blow it out his Arse Bowey"


( snip brain dead drivel)


** Look - nothing left.

As always from the Bowey bullshit artist.



........ Phil

Did you say something important? It seems to have got lost.

Don
 
M

MooseFET

Jan 1, 1970
0
I'm not sure if this is a good analogy to help answer the original
question...if you strike a bell, it will ring at the resonant frequency of
the bell structure and not generate harmonic frequencies relating to the
rate in which you strike it.

The bell isn't generating anything. It really is a filter and in fact
its output will only have harmonics of the rate it is struck at.
 
J

John Larkin

Jan 1, 1970
0
"John Larkin ASD Cretin "



** More brain dead BOLLOCKS !!

Classic, grossly autistic engineer think.

Larkin sure as hell is an autistic.

Plus he has the pig arrogance that accompanies it.

Your definition of "autistic" seems to encompass anyone who can
understand something that you can't. Given that, there are indeed a
shocking number of autistic engineers.

John
 
J

John Larkin

Jan 1, 1970
0
The bell isn't generating anything. It really is a filter and in fact
its output will only have harmonics of the rate it is struck at.

Well, you can whack it once.

John
 
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