how does a CD still play normally when it’s scratched?
In: Mathematics
For two reasons,
1. CD players have over the years become a lot better at dealing with scratches and other types of read errors. They are, simply put, decently good at overlooking optical issues.
2. The audio stream format on the disc, PCM, is deliberately designed to allow a misread here and there, and still produce sound that doesn’t get interrupted. It both has a massive amount of data that can be used to recreate data that went missing in the stream and, to be frank, an excess amount of data to begin with so that it’s not really the end of the world if a small amount goes missing.
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