[Dtb-talk] DTB Here and There
Tim Gillett
tim.gillett at optusnet.com.au
Fri Jan 22 14:06:43 UTC 2010
Hi Joseph,
A late answer to your technical question about the Graf Digitisers.
Since I located the Digitisers on the www and suggested them to ABWA
I can pass on to you some of their technical details.
For 2 track tapes they use a stereo soundcard capable of 192khz sample rate,
and two such soundcards for 4 tracks.
The tapes run at about 16.3 ips
which translates to a sample rate of 22.05khz for 2 track and 11.025khz for LOC 4 track.
So frequency response is reasonable for speech material
and considering the limitations of the cassette tapes themselves.
The stereo version has a 4 track head installed and so can copy all 4 tracks in one pass.
The mono version can copy both 'sides' of a 2 track tape also in one pass.
All in all a good way to convert a lot of tapes in a hurry, but of course
it falls short of the ideal for format conversion where the aim is
not to compromise the original audio fidelity.
Best wishes
Tim Gillett
Audio/Electronics Technician
Perth, Western Australia
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