"Eiron" wrote in message
...
On 19/12/2010 20:22, David Looser wrote:
"JNugent" wrote in message
...
On 19/12/2010 19:05, Dave Plowman (News) wrote:
I can still cope with pretty well any 1/4" tape here at home, with the
exception of 30 ips.
You can just spin them into the computer at 15ips and adjust the sample
rate to convert them...!

I've done much the same thing with some 1/4" tapes recorded at 1 7/8 ips,
playing them back at 3 3/4 ips and using CoolEdit to stretch the time
scale. The only problem is that you need to copy and convert before you
can decide whether the material is worth keeping!

Frequency response?
Did tape use HF pre-emphasis and was it different for different tape
speeds?
Dolby would complicate things even more.


No Dolby, these tapes were recorded on a portable reel-to-reel recorder that
was manufactured long before Mr Dolby got into the noise-reduction business.
As for frequency response, yes there is a theoretical error in copying at
the wrong speed. In practice, though, it wasn't worth worrying about the
theoretical error, given all the other factors that affected the overall
frequency response. So I used Cool Edit to apply whatever modifications to
the FR that made the result sound as natural as possible to my ears.

Dacvid.