Re: [ARSCLIST] 1/4" audio tape digitizing

[Michael Shoshani <mshoshani@xxxxxxxxxxxxx>]

Jeffrey Kane <jeffkane@xxxxxxxxxxxxxxx> wrote: 

>That all depends on the speed of the tape you're digitizing and the speed of
>your deck. If it's 15/16 IPS and you're playing at 30IPS, you are playing
>the tape at 32x realtime and will be able to digitize an hour's worth of
>data in 1.875 minutes. I have no idea how this would sound. If the
>recordings are at 3.75 IPS and you play at 30IPS you are playing at 8x
>realtime speed and can digitize 60 minutes of audio in 7.5 minutes. 

How does that affect the frequency response, though?

I mean, theoretically...let's say you have a machine whose high end
tops out at 25 kHz.  You have a tape whose highest frequency is 22
kHz. If you play that tape at twice its speed, I should think that the
high frequency now tops out at 44 kHz while the machine itself is
still limited to 25 kHz, rather destroying any nuances in that 22 kHz
sound once it's been brought back down to normal playing speed.

Or is my math severely off? (This is something I have wondered about
for years concerning high-speed tape duplication...)

Michael Shoshani
Chicago