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Sine waves

Discussion in 'Electronic Design' started by john, Sep 9, 2006.

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  1. john

    john Guest

    Hi,

    Does sine wave has more than one harmonics at lower and higher
    frequncies? or whatever the frequency the sine wave has always one
    fundamental frequency or harmonics. Please accept my apologizes if I am
    asking the wron question?

    John
     
  2. Boris Mohar

    Boris Mohar Guest

    No harmonics for a sine wave that has existed and will exist for all eternity
    at same amplitude and frequency.



    Regards,

    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

    void _-void-_ in the obvious place
     
  3. johnbscot

    johnbscot Guest

    I don't understand why you are asking the question in the first
    place.... it is clearly obvious that a pure sinewave has no harmonics!


    John
     
  4. Bob Eld

    Bob Eld Guest

    A pure sine wave has one harmonic, the first harmonic otherwise known as the
    fundamental. It has no higher harmonics. However any real sine wave
    generated with normal electronic oscillators, etc. will never be absolutely
    pure and will., therfore, have some harmonics as well as non-harmonic noise.
    For example if a wave is 99.9% pure, it will have noise and harmoncis adding
    to 0.1%. This level is only 60dB below the fundamental so even that is not
    very pure by some standards. Sub harmonics below the fundamental in
    frequency can exist but are usually not present.
     
  5. Phil Allison

    Phil Allison Guest

    "Bob Eld"


    ** Since this NG (and the question) is about science and electronics and
    NOT musical terms, the above is incorrect.

    Harmonics are frequencies that are integer multiples, 2, 3, 4, 5 etc, of
    the fundamemetal frequency of a complex wave.





    ........ Phil
     
  6. John  Larkin

    John Larkin Guest


    Most engineers pretty much equate "harmonic" with "Fourier component",

    0th harmonic = DC term

    1st harmonic = fundamental,

    etc.

    But it's just a convention, so there's no hard right or wrong.

    John
     
  7. Bob Eld

    Bob Eld Guest

    I believe you have it backwards. In music the first overtone is the second
    harmonic which is 2 times the fundamental in frequency. The fundamental in
    engineering, audio and related fields is the first harmonic even though the
    word "harmonic" is misleading. As was mentioned, the terminology comes from
    the Fourier series.
    Your statement: "Harmonics are frequencies that are integer multiples, 2,
    3, 4, 5 etc, of
    the fundamemetal frequency of a complex wave." That is a true statement but
    don't forget that "1" is also an integer.
     
  8. Phil Allison

    Phil Allison Guest

    "Bob Eld"
    "Phil Allison"

    ** I believe you have your head permanently stuck up your arse.


    ** Yawn - not even on the point at issue.


    ** Yawn - just restates the original error.


    ** Not mentioned by you, me or the OP.

    Plus not relevant anyhow.


    ** How typically asinine & autistic of you.

    Cut the verbal diarrhoea.

    A pure sine wave is one that simply has NO harmonics present.





    ....... Phil
     
  9. Guest

    This gets down to mere semantics, but I have to agree,
    you never really hear people talking about a "first harmonic".
    They almost always call the main frequency the "fundamental", and
    only use the term "harmonic" for integer multiples of the fundamental,
    2x, 3x, 4x, and higher.

    But the kicker here is that people will often use the term
    "Half-harmonic", to indicate a spur 1/2 the fundamental.
    When occuring in power amplifiers, these mysterious half-harmonics
    are thought to be caused by some sort of varactor effect.
    When they occur in frequency doublers, the failure to suppress
    and filter the original fundamental is the obvious cause (the
    2nd Harmonic essentially becomes the new fundamental).



    Slick
     
  10. Phil Allison

    Phil Allison Guest


    ** The implied meanings of words an terms is hardly trivial.

    It is the way humans communicate.


    ** Google gives many hits on the term.

    Mostly in the musical context.



    ** A Google search gives that definition exactly, over and over.


    ** Correct usage depends on the context and the audience.

    Long as the aim is to inform and not confound.





    ......... Phil
     
  11. John  Larkin

    John Larkin Guest

    Techs like to argue over terminology and definitions, as if they were
    important. All that really matters is the math.

    John
     
  12. Bob Eld

    Bob Eld Guest

    I see that Fillup Asshole has raised his ugly head again with his usual
    polite crap and name calling. This, of course says more about him than about
    me or any other poster he denigrates of which there are quite a few. It
    seems he has little to say that is not an insult or asinine retort rather
    than a constructive discussion of the subject at hand. It's too bad to waste
    bandwidth on such a jerk, maybe he should swim with the sting rays down
    there or at least crawl back under his rock gooday mate!
     
  13. Jim Thompson

    Jim Thompson Guest

    [snip]

    If you would simply plonk Fillup Asshole, you would not be bothered.

    ...Jim Thompson
     
  14. In message <>, dated Sun, 10
    How dull, though! Besides, if you plonk him, you can't call him Phyllis
    Alison when he becomes more than usually obnoxious. He doesn't like
    that.
     
  15. John  Larkin

    John Larkin Guest

    I suppose you've noticed how absolutely humorless Phyllis is. What a
    way to live!

    John
     
  16. Jim Thompson

    Jim Thompson Guest

    I think I need to get the latest version of Agent. Looks like "Ignore
    Sub-thread" may allow me to even miss replies by others to Allison,
    Eeyore, Frank B, Sloman, etc... so they will truly cease to exist ;-)

    ...Jim Thompson
     
  17. In message <>, dated Sun, 10
    He did post a joke once. I suspect his most colourful posts are fuelled
    by Bundaberg.
     
  18. That's because Phillis wants to be called "She".


    --
    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
     
  19. Phil Allison

    Phil Allison Guest

    "John Larkin"

    ** They are very important to communication of ideas.


    ** How completely autistic.

    Bet JL can recite " pi " to hundreds of decimal places.




    ......... Phil
     
  20. Phil Allison

    Phil Allison Guest

    "Bob Eld"

    ( snip peurile abuse)


    ** Another autistic prick bites the dust.





    ....... Phil
     
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