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Re: [ARSCLIST] Recording 1 7/8 at 3 3/4
At 01:59 PM 5/13/2003 -0400, Matt Sohn wrote:
I have several tapes in our collection that were recorded at 1 7/8 IPS. Our
playback machine's slowest speed is 3 3/4 IPS. I have been transferring
these tapes at 3 3/4 and slowing them down in the computer using DartPro98
software. Seth Winner was here last week to drop off some acetates and when
I mentioned what I had been doing, he pointed out that the playback
equalization would be off using this method. He did not, however, tell me
how I could correct the problem. can anyone here help?
Not surprisingly, he is correct. (How could it be otherwise?)
I know of no simple table of the differences in EQ, but both standard
curves are published and should be locatable in audio references. One can
compute the correction curve (it is not severe) from the parameters or
approximate it from the curves which should be available with them.
However, in general tapes recorded at 1 7/8 are live recordings of speaking
voices. If that is the case, I suggest that audibility is of more value
than precision. For that correction, I use my ears, not tables.
Another step can save you a great deal of effort. When faced with that
situation, I record as usual, then rename the extension from WAV to
whatever your editor prefers for a raw file - RAW and PCM are typical
extensions. Then open the file and tell the software a small lie: say you
recorded at 22500 instead of 44100 sps. Clip off the header, edit as you
wish, and save as a 22.5 ksps WAV. There are no losses and no delays for
"resampling" which only interpolates values not in the original. That
interpolation will be done comparably well (for such low-fi originals) by
your CD-DA software.
The same procedure can be used for pitch changes when the error is known a
priori.
Mike
mrichter@xxxxxxx
http://www.mrichter.com/