This is getting way off topic, but since it started that way I guess it's
okay.
Since we can hear frequencies from 20-20KHZ, we want a sampling rate that
can reproduce all those frequencies. A sampling rate can reproduce all
frequencies up to half of it. So, a sampling rate of 8KHZ, which is what
telephones use, can only reproduce frequencies up to 4K.
So, since we want to reproduce all frequencies up to 20K, a rate of 40K at
least is required. But, we need to make some room for filters to filter
excess frequencies out. If we get over the halfway point of our sampling
rate, the higher frequencies get pushed down to lower ones, since the
sampling rate isn't high enough to represent them. So, we use a 44.1K
sampling rate to give filters some room to filter out those excess
frequencies above 20K. I don't know where they came up with that exact rate
though.
And for bits, it's sort of like midi ranges. 16 bits is going to allow more
precise control of volume than 8 will, and give a cleaner sound. Just like
128 note velocities will give you more control and smoothness than 32 or
something.
----- Original Message -----
From: "Alfredo The Writer of music scores" <[email protected]>
To: "QWS list" <[email protected]>
Sent: Saturday, May 07, 2011 12:49 AM
Subject: Re: QWS List off topic, audio recording
Um, let me ask more about bit and Hertz. How does changing KHZ affect the
frequency of sound. I mean, if you are at 44000 Hz, you canto hear
anything than if you were in 8000 Hz which spuds like a phone or
something.
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