WHITE MOUNTAIN PUZZLES OFFERS A HUGE VARIETY TO CHOOSE FROM, INCLUDING SOME THAT FEATURE NEW HAMPSHIRE AND OTHER AREAS OF NEW ENGLAND. THEY SAY THERE'S ONE TYPE OF PUZZLE THAT CUSTOMERS ARE DRAWN TO.

It was a 50-year-old puzzle in signal processing. That is, until last fall when two Iowa State engineers – Stoytchev and Vladimir Sukhoy – announced in a research paper they had come up with a ...

Iowa State's Alexander Stoytchev and Vladimir Sukhoy have solved a 50-year-old puzzle in signal processing. They've formulated the "inverse chirp z-transform," an algorithm related to one that's ...