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AudioAcoustics

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Jan 28, 2004

For various reasons, both personal and professional, I’ve been doing quite a bit of reading for the past few weeks.

Some interesting items:

There was some discussion during the December BAS meeting about Dolby’s perceptual coding algorithms, and the subject of forward and backward masking came up. Some BAS’ers weren’t familiar with forward/backward masking (as opposed to simultaneous masking which should be familiar to most audio people).

To help people understand this type of masking, I scanned some pages from Brian Moore’s An Introduction to the Psychology of Hearing for that discuss forward and backward masking. Feel free to have a look (1.2 MB PDF).


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Jan 05, 2004

Mini-review: I received a Digital Innovations SkipDoctor as a stocking stuffer this past Christmas. I tried it out on one my CD’s — the CD had a lot of light scratches on its outer edge, and the last few tracks on this CD were either unplayable or skipped heavily on every CD player/CD-ROM/DVD-ROM drive I tried it on.

The SkipDoctor appears to do everything by-the-book. In particular, the polishing wheel moves radially across the disc, using a slow and smooth motion. I put the CD through the kit, and the CD plays fine now.

I don’t know how well this device works on deep scratches, and of course I can’t guarantee it works all the time, but it does seem to work. Please remember that anecdotes are not data.


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