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Old 2019-03-07, 04:29 AM
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hendrixfan1995 hendrixfan1995 is offline
 
Join Date: Jul 2015
Location: Germany
Re: Where to start with remastering/cleaning audio? (Need help)

Here's an example of a show recorded from a TV broadcast in 1972:

https://we.tl/t-r7lE78AjGR

From the release notes:
Quote:
This inline recording was captured from a TV broadcast. Even though the music rolls off at 8 kHz, the recording quality is so clear that it has the original PAL sync tone almost continously throughout at around 15kHz. This pilot tone can be used to lock the recording to its original speed and pitch, exactly as broadcast. With the PAL sync tone restored to its proper 15625 Hz, all tape speed drift (wow & flutter) is now corrected.

On top of Kneesfudd's Mk1 restoration, a few more more dropouts and clicks have been fixed for this version. Three sub-second tape defects that could not be restored from this tape alone have been patched in from two alternate, incomplete sources: fixes for tracks 1 & 2 come from the old boot version; track 13 has a segment from from "Stephen Stills - Wooden Music Compilation" (assembled by Eddie Hill) spliced in. Some annoying amplifier buzzes and feedback beeps have been removed from the spectrum.

The EQ has been restored with an EQ curve averaged from several differential EQ samples (the final EQ curve is included as an audacity XML file for reference). The main source (Kneesfudd's Mk1) is less compressed than the boot version, so the original dynamics are preserved. The acoustic songs are, in fact, not significantly cleaner on the boot version - that seems to be an artifact of signal compression and some overtone distortion. I should also note that the boot is not in simulcast stereo (ie. two discrete channels), but merely mock stereo with different equalization on either channel.
Here's another one - this only removes the cyclic tape wow effect (listen with speakers, not headphones, to make the difference most perceptible). It's about the most difficult audio problem you could attempt to fix:
https://we.tl/t-opTgcd6CM6
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