# Sine wave frequency

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#### thejim

Jan 1, 1970
0
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.

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#### Phil Allison

Jan 1, 1970
0
"thejim"
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.

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

Look up " simple harmonic motion " .

........... Phil

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#### Mac

Jan 1, 1970
0
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.

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

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.

sci.electronics.basic?

--Mac

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#### Don Lancaster

Jan 1, 1970
0
Mac said:
The simple answer is that in popular usage a sine wave is only a single
frequency.

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.

sci.electronics.basic?

--Mac
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

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

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#### Paul Burridge

Jan 1, 1970
0
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.

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.

M

#### Mac

Jan 1, 1970
0
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.

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
result.

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

--Mac

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#### Mac

Jan 1, 1970
0
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.

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

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

--Mac

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#### theJackal

Jan 1, 1970
0
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.

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"

theJackal

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#### Phil Allison

Jan 1, 1970
0
"theJackal"
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.

** Huh ??

Better lay off them hallucinogenics - mate.

......... Phil

T

#### theJackal

Jan 1, 1970
0
"theJackal"

** Huh ??

Better lay off them hallucinogenics - mate.

........ Phil
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
soul!
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.

Phil
"Go easy on the whisky"

theJackal

P

#### Phil Allison

Jan 1, 1970
0
" The Jackass "

"Phil Allison"
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
soul!

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

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.

** Absoulute rubbish.

A pure sine wave is a SINGLE frequency.

......... Phil

T

#### theJackal

Jan 1, 1970
0
" The Jackass "

"Phil Allison"

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

** Absoulute rubbish.

A pure sine wave is a SINGLE frequency.

........ Phil

The two most common elements in the universe are Hydrogen and
stupidity.

Harlan Ellison

"Go easy on the whisky"

theJackal

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#### Phil Allison

Jan 1, 1970
0
"theJackal"

** = the wog Jackass.

Must be one of them wannabe terrorist imbeciles.

......... Phil

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#### theJackal

Jan 1, 1970
0
Must be one of them wannabe terrorist imbeciles.

........ Phil
Keep panting in your bottomless pit wannabe engineer.

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

"Go easy on the whisky"

theJackal

P

#### Phil Allison

Jan 1, 1970
0
"theJackal"

** Fucking wog psycho.

.......... Phil

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