h a l f b a k e r yKeep out of reach of children.
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Parallel Thinking Department: In my latest just opened New Scientist "Patents" column there appears a similar idea based on a buried audio signal, but recognised by a code-loaded badge you wear, not apparently, by my smart card which you buy as your ticket. So I've goofed again. |
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A world of possibilities here, supermarket lotteries, for product promotion, keys for new cars, doors that mysteriously open for you, leading to god only knows what adventures - I should have never studied marketing. |
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The point is that audio signals can be carried in regular TV/radio programming. |
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