Hi, these numbers were generated as a result of early digital recording being stored on video tape, and thus in video formats rather than hard drives. For an explanation including the formula, a little technical and definitely way off topic for here which is why I'm posting the link rather than the article itself see: http://www.cs.columbia.edu/~hgs/audio/44.1.html hth. Cheers!
-------------------------------------------------- From: "Raymond Grote" <[email protected]> Sent: Saturday, May 07, 2011 1:38 AM To: "QWS list" <[email protected]> Subject: Re: QWS List off topic, audio recording > 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. >> To unsubscribe or change list options, see http://lists.andrelouis.com >> >> for archived list posts, see >> http://www.mail-archive.com/[email protected] > > To unsubscribe or change list options, see http://lists.andrelouis.com > > for archived list posts, see http://www.mail-archive.com/[email protected]
