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Message |
thejim
Guest
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 Posted:
Sun Dec 11, 2005 9:35 am Post subject:
Sine wave frequency |
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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
Guest
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| Posted:
Sun Dec 11, 2005 4:27 pm Post subject:
Re: Sine wave frequency |
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"thejim"
| Quote: |
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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** 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
Guest
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| Posted:
Mon Dec 12, 2005 12:36 am Post subject:
Re: Sine wave frequency |
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On Sun, 11 Dec 2005 01:22:38 -0800, thejim wrote:
| Quote: | 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.
What made you think to ask this question here instead of, say,
sci.electronics.basic?
--Mac
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Don Lancaster
Guest
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| Posted:
Mon Dec 12, 2005 12:48 am Post subject:
Re: Sine wave frequency |
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Mac wrote:
| Quote: | On Sun, 11 Dec 2005 01:22:38 -0800, thejim wrote:
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.
What made you think to ask this question here instead of, say,
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
rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com
Please visit my GURU's LAIR web site at http://www.tinaja.com |
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Mac
Guest
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| Posted:
Mon Dec 12, 2005 1:35 am Post subject:
Re: Sine wave frequency |
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On Sun, 11 Dec 2005 11:48:08 -0700, Don Lancaster wrote:
| Quote: | Mac wrote:
On Sun, 11 Dec 2005 01:22:38 -0800, thejim wrote:
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.
What made you think to ask this question here instead of, say,
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.
|
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
Guest
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| Posted:
Mon Dec 12, 2005 1:35 am Post subject:
Re: Sine wave frequency |
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On Sun, 11 Dec 2005 21:54:06 +0100, Paul Burridge wrote:
| Quote: | On Sun, 11 Dec 2005 11:48:08 -0700, Don Lancaster <don@tinaja.com
wrote:
Mac wrote:
On Sun, 11 Dec 2005 01:22:38 -0800, thejim wrote:
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.
What made you think to ask this question here instead of, say,
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.
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?
<Checks google groups>
No, I don't see anyone who seems to be forgetting that.
--Mac |
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Paul Burridge
Guest
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| Posted:
Mon Dec 12, 2005 1:35 am Post subject:
Re: Sine wave frequency |
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On Sun, 11 Dec 2005 11:48:08 -0700, Don Lancaster <don@tinaja.com>
wrote:
| Quote: | Mac wrote:
On Sun, 11 Dec 2005 01:22:38 -0800, thejim wrote:
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.
What made you think to ask this question here instead of, say,
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.
|
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.
--
"What is now proved was once only imagin'd" - William Blake |
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