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Sine wave frequency

Discussion in 'Electronic Design' started by thejim, Dec 11, 2005.

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  1. thejim

    thejim Guest

    I wanted to ask if the sine wave can only have 1 frequency which is
    standard or it can take the form of more than 1 frequency.
  2. Phil Allison

    Phil Allison Guest


    ** A single frequency is a sine wave AND a sinewave is a single frequency.

    Look up " simple harmonic motion " .

    ........... Phil
  3. Mac

    Mac Guest

    The simple answer is that in popular usage a sine wave is only a single

    But in the real world there is always noise riding on that sine wave, and
    possibly other sine waves of smaller amplitude. So if you look at your
    sine wave on a spectrum analyzer, you will find that the peak is not a
    spike, such as you would see in a purely mathematical Fourier transform,
    but is spread out over some frequency range.

    You would also see that there are harmonics present. That is to say, there
    are components at 2x, or 3x or some higher integer multiple of the
    fundamental sine wave frequency.

    What made you think to ask this question here instead of, say,

  4. A sinewave could only have a single frequency if it was on forever.
    The switching envelope will otherwise interact with the sinewave itself.

    Which is what windowing is all about.

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: email:

    Please visit my GURU's LAIR web site at
  5. People here seem to be forgetting it's a *pure* sine wave that
    constitutes a single frequency. Any form of ' irregular sine wave'
    will contain components of other frequencies and they may not be
    apparent from visual examination of the wave on an oscilloscope. Their
    presence undeniable, nevertheless.
  6. Mac

    Mac Guest

    True enough. And even if the sine wave did go on forever, you couldn't
    measure its spectrum on a spectrum analyzer unless the spectrum analyzer
    existed forever, and waited until after the end of time to display its

    But the simple answer is still "Yes, a sine wave is a single frequency." ;-)

  7. Mac

    Mac Guest

    Which people are you talking about? Maybe there are some posts which have
    not appeared on my server yet?

    <Checks google groups>

    No, I don't see anyone who seems to be forgetting that.

  8. theJackal

    theJackal Guest

    Digital communication engineers prefer viewing Sine waves and all
    periodic functions in the frequency domain , which actually implies
    analyzing their Fourier transforms. Accordingly you can view a Sine
    wave as the sum of an infinite number of sinusoids having frequency
    components which are integral multiples of the fundamental frequency.

    "Go easy on the whisky"

  9. Phil Allison

    Phil Allison Guest


    ** Huh ??

    Better lay off them hallucinogenics - mate.

    ......... Phil
  10. theJackal

    theJackal Guest

    ha ha You answer to the Op that that he needs to check up Simple
    Harmonic motion to understand a Sine wave and now this . oh help my
    You need basic education man ... The "average" engineer knows what
    Monsier Joseph Fourier discovered more then 200 years ago
    Sine (w*t) = a + (sum of ( bn* Cos n *w* t + phi (n)) The addition
    is carried over for n that varies from 1 to infinity.

    "Go easy on the whisky"

  11. Phil Allison

    Phil Allison Guest

    " The Jackass "

    "Phil Allison"

    ** You are a schizo, fucking IDIOT - Piss Off .!!!!!!!!!!!!

    ** Absoulute rubbish.

    A pure sine wave is a SINGLE frequency.

    ......... Phil
  12. theJackal

    theJackal Guest

    Go change your diapers.

    The two most common elements in the universe are Hydrogen and

    Harlan Ellison

    "Go easy on the whisky"

  13. Phil Allison

    Phil Allison Guest


    ** = the wog Jackass.

    Must be one of them wannabe terrorist imbeciles.

    ......... Phil
  14. theJackal

    theJackal Guest

    Keep panting in your bottomless pit wannabe engineer.

    "I actually prefer thugs to fools because they sometimes take a

    "Go easy on the whisky"

  15. Phil Allison

    Phil Allison Guest


    ** Fucking wog psycho.

    .......... Phil
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