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hardcore1231
Starting Member
Bhutan
4 posts
Joined: Nov, 2005
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 Posted - 2005/11/14 : 09:32:16
Anyone want to write up a good tutorial on understanding frequencies??
If I have a sound starting at 440 hz and finsihing at 3 Khz and the next sound at 480 hz and finishing at 3.2 khz. At some point these two frequencies will takeup the same space Am I right?
How do I overcome That.
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ryg0r
Advanced Member
Australia
2,807 posts
Joined: Aug, 2002
34 hardcore releases
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Posted - 2005/11/14 : 11:21:24
It depends on the type of sound really.
You will need to explain your problem more though.
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hardcore1231
Starting Member
Bhutan
4 posts
Joined: Nov, 2005
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Posted - 2005/11/14 : 16:08:19
Ok I have a sawtooth starting at 440hz and I start rolling off the high end at about 3 kz
I then put a sine wave at 460hz and start rolling off the high end at 3.5 kz.
Now at some stage between these two sounds the frequencies are going to be the same.
But what happens when the frequencies that are the same start clashing, but when you try to adjust them the tune starts loosing its appeal.??
What would your assumptions be
What way would you look at it
Cheers Its really bothering me.
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The Deviant
Senior Member
United Kingdom
329 posts
Joined: May, 2004
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Posted - 2005/11/14 : 21:11:27
Actually, they wont, cos' a sine wave only contains the fundimental pitch and no harmonics. And at those frequency's the sawtooth would be an A and the sine would be and out of tune A#. So they won't be any frequency's that are the same. Playing an A with an A# is not ganna sound good, no matter how much you EQ them.
Personally, if I just had those two sound, I wouldn't EQ them.
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Underloop
Advanced Member
United Kingdom
3,895 posts
Joined: Mar, 2002
91 hardcore releases
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Posted - 2005/11/15 : 18:29:38
quote:
Originally posted by The Deviant:
Actually, they wont, cos' a sine wave only contains the fundimental pitch and no harmonics. And at those frequency's the sawtooth would be an A and the sine would be and out of tune A#. So they won't be any frequency's that are the same. Playing an A with an A# is not ganna sound good, no matter how much you EQ them.
Personally, if I just had those two sound, I wouldn't EQ them.
Nail, head etc...... if I get chance I'll do a frequency tutorial, but don't hold your breath as I'm ultra busy right now.
As a little taster, a chap called Fourier realised that any signal can be made up of a number of different monotonic sine waves of varying amplitude. A monotonic sine wave is just a single frequency as The Deviant stated. By taking 2 sine waves of different frequency (or even the same frequency, but out of phase) you can alter the shape of the signal, and hence the sound. A saw wave is made up of a large amplitude "root" sine, plus lots of harmonics. The harmonics are multiples of the root, or fundamental, frequency. Say for instance you had a 100Hz tone. The 2nd harmonic occurs at 200Hz, the 3rd at 300Hz and so on. These can also be thought of in terms of musical intervals, the 2nd harmonic being an octave above the fundamental, teh 3rd an octave and a fifth, teh 4th 2 octaves and so on.
So, I guess in answer to your original question, but changing it around slightly, if you had 2 saw waves at those frequencies then with the above bit of knowledge, and some very careful EQing you could let the 2 overlay...... but you need to think musically as well as technically as The Deviant pointed out.
As an extra bit of info, a square wave is made up of a fundamental frequency, plus the odd harmonics (ie 3rd, 5th, 7th etc), as is the triangle wave.... however the phase of the harmonics is what differentiates the 2 signals...... for more detail, watch this space!
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