[Dtb-talk] DTB Here and There

[Greg Kearney]

I was informed by the maker of the units that they now have a version  
for doing 4 track mono tape as well.

Sent from my iPhone

Greg Kearney
Association for the Blind of Western Australia

On 22/01/2010, at 10:06 PM, "Tim Gillett"  
<tim.gillett at optusnet.com.au> wrote:

> 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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