Not quite. It might SHOW you frequency, but the Y value at any given
point on the plot is the intensity of the wave at that instant in time.
Consider a plot of your mains power, a nice, regular sine wave. The
value of each point is the voltage at that instant. If you look at the
plot as a whole, you can see that the sine wave runs at 60Hz (or 50Hz),
but the individual points are voltage. It's a plot of voltage, not
frequency.
"Volume" is perhaps a bit misleading; the volume is the average
intensity of the wave over a short period. Even a very high volume
signal will have zero crossings. Like mains power, even though we say
the voltage is 120v (or 220v), the instantaneous voltage goes to zero
120 (or 100) times a second.
By the way, one of the nice things about MP3 files is that it is not
necessary to start decompression at the beginning. You can start at
almost any point in the middle, find a frame boundary pretty quickly,
and start decompressing from there.
ยทยทยท
On Mon, 26 Jan 2009 23:01:39 -0200, Lucas Boppre Niehues <lucasboppre@gmail.com> wrote:
Thanks for trying to simplify things Nitro. Explaining myself about
the volume graph, I though common waveforms were plotted using
/frequency/, not volume.
--
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.