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Nasir Ahmed invented the discrete cosine transform compression algorithm in 1974 .
DCT is a key component of many past image- and video-coding algorithms for more than three decades .
It has changed the way fans buy, collect, and store their favorite songs online.
Ahmed published his seminal paper about DCT in 1974 , a time when the Internet was exclusively dial-up.
Ahmed was a professor at Kansas State University in 1968 when he returned to academia.
He sought grant funding that would let him afford to spend months between Kansas State’s spring and fall semesters furthering his ideas.
He applied for a U.S. National Science Foundation grant, but was denied.
He and his team published a paper in IEEE Transactions On Computers titled “ Discrete Cosine Transform ” in 1974 .
In 1993 , Ahmed left Kansas State and returned to the University of New Mexico .
He was a presidential professor of electrical and computer engineering until 1989 .
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