By the 1960s these units had become smaller, and had developed to include stereophonic reproduction.
2.
Pavel argues that he filed a patent for a " stereophonic reproduction system for personal wear " in 1977, two years before Sony launched the Walkman.
3.
He was credited with discovering the basic psychological principle _ based on the different perception of sound by each ear _ that makes stereophonic reproduction possible.
4.
"' Irving M . " Bud " Fried "'was one of the well known American audiophiles of the " Golden Age " of stereophonic reproduction such as Saul Marantz and David Hafler.
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