| From Rick Brahim
| Thu, 30 Nov 2006 16:29:52 -0500
| Subject: [Audacity-help] software conversions
| I would like to convert some 78 records to mp3 files and all the
| turntables say 45 and 33 Will your software adjust?
Yes. Play the record at either 45 rpm or 33 1/3 rpm then select all the
track by clicking in the Track Panel (where the Mute/Solo buttons are)
and click Effect > Change Speed. In the "From" box choose the speed
you played the record at (i.e. "33 1/3" or "45") and in the "To" box
Note that all modern turntables use RIAA equalisation when playing
records which imposes a heavy cut in high frequencies to compensate
for the high-frequency biassed cutting of modern LPs. However most
78 rpm records were not cut with such a strong high frequency bias and
so sound dull if played through a modern turntable using RIAA equalisation.
Therefore to make a fully professional job of transferring your 78rpms you
would be advised to also use Effect > Equalization and draw and apply the
inverse of the RIAA playback curve (i.e. the green recording curve shown in
This will cancel out the unwanted RIAA equalisation then you can apply one
of the 78 rpm preset curves supplied with the Audacity equalizer.
Alternatively you could just make a rough alteration to the equalization
by boosting the higher (right-hand) frequencies somewhat (i.e. draw a
curve on the graph that drags them above the horizontal). In the case
of acoustic 78 rpms, they were generally cut with a fairly heavy boost to
both treble and bass, so if you were making a rough alteration to the
equalization of these without undoing the RIAA equalisation, you'd instead
reduce the lower frequencies which would have been wrongly boosted in
the playback through the modern turntable.
Additionally, to export your recording from Audacity as an MP3 file, you
will need to add the LAME MP3 encoder to your computer and point
Audacity to it. See:
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Tested on: 12/1/2006 12:53:04 AM