Ok this is easy....
Step 1. Draw 2 sine waves with their intial points about half an inch (1 cm for
those of us not in the US).
Step 2. Draw 10 vertical lines through the waves, these will represent the
points in time we will then average
also draw a horizontal line through where each wave starts (the
baseline).
Step 3. Now at each point in time (node), measure the distance from the
baseline to that point in the wave, for each wave. Add the two
measurements together and draw a point in at the added height.
Step 4. Once all ten points are done try and draw as smooth a curve through
each point as possible.
Result: This is the resultant sound wave. While the initial sine waves are nice
and rounded you will find that as you map more and more nodes that the two out
of sequence waves tend to form a more square like wave.
Notes on Square waves: When a square wave is produced the audible sound is not
continuous (ie you hear a shortened sound that does not represent the whole
wave.) This is due to the nature of sound (there must be a change in amplitude
of the wave in order for it to be audible, therefore in square waves where the
wave remains at a constant amplitude for a extended time period there is no
sound.)
This is why in audio when large wave forms (ie. bass) become square they audibly
click and are shorter then the resultant in sequence waves. Small wave forms
(ie hihats) however have tiny square waves and cut out only for nanoseconds at
most, this is why the high end will sound like flanging, as the rate of change
of the distance between the competing waves changes, the tonal quality of the
high end will change as well.
I hope that helps (I did three years worth of physics, mostly sound and
electric)
todd
darw_n wrote:
> hehe, the answer is right below your question!! ;)
>
> The slight drift out of sequence causes wave cancellation...
>
> Now, someone on here can perhaps provide a more technical explanation...
>
> > I have not been following this closely so don't shoot me if this has been
> > ask before. If you doubledeck two identical copies and you get it just
> > perfect, then it seems like there is a wave going through the track. Does
> > anybody have an idea why this occurs?
> >
> > Thanks,
> >
> > J
> >
> >
> > the records slowly drift out of sequence, and then you get cancellation...
> >
> >
> >
>
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