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Ralph Barone[_3_] Ralph Barone[_3_] is offline
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Default Sample Rate Conversion

mcp6453 wrote:
For whatever reason, I have some spoken word cassettes that were
recorded at 15/16 IPS that I want to transfer to digital. What's the
best way to digitally correct the tempo and pitch? Using Audition, I
recorded a segment at 88.2 and converted the playback sample rate to
44.1. Tempo and pitch are correct. Is that procedure the best way? Doing
them in software, at least using Audition, is not the way to go.


This sounds like a robust and easy way to do it. There are two downsides:

1) Your cassette deck may not be capable of playing back the doubled
frequency components on the tape, so your highest octave is theoretically
lost. For spoken word, that shouldn't be an issue.

2) The playback eq will be wrong because the frequencies that were boosted
on record aren't being played back at the same frequency they were recorded
at. I forget what the corner frequencies for cassette tape are, but you
should be able to apply eq after the fact to compensate for the difference
between what should have been applied and what was actually applied. If the
model in my head is correct, it would be a 6 dB shelving bass boost,
applied over one octave.

PS: Somebody who actually knows this stuff properly will hopefully chime in
and clarify.