Using Digital Tools to Repair Analog Audio

This is a fascinating story about a new digital technique for reducing "warble" on old analog recordings. The audio examples are amazing...

Robert Siegel talks to Jamie Howarth about the next step in audio restoration: ridding analog-era sound of its inevitable speed variations by writing software that virtually recreates the original device on which a recording was made from the existing tape.

The sound is then digitally fed back through that machine to correct the errors due to azimuth, capstan bumps, tension in reels, etc. To say the least, it's a complex algorithm.

This older article — something of a "survey of techniques" — mentions the process in passing. And more at the company site: PlangentProcesses.com.

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