Man Mohan Sondhi
The University of Wisconsin meant access to the world’s most advanced technologies of research in the physical sciences, but it also meant American Folk music. In both of these realms Sondhi excelled and both he would then bring back to India upon graduation. But even now as part of the faculty, the Institute of Science at Banglore failed to capture Sondhi’s research ambitions in acoustics and electronics, and so when the opportunity came he once again crossed one of the world’s larger oceans for a wintery capitol, this time Toronto, Ontario. But the stint at the University of Toronto proved brief, for a dream came true and Sondhi (despite Cold War prohibitions against hiring non-citizens) was awarded a position at Bell Laboratories in New Jersey in 1962.
After so many years itchy feet, Sondhi was due for some constancy and domesticity, and this he got by staying at Bell Labs for the following 39 years in the Information Principles Division. The academic atmosphere of Bell Labs at the time meant that researchers were hired for their general abilities, not to work on specific issue, such that they would be capable of solving whatever diverse problems came their way. For Sondhi, such an problem arose in his first week at the Labs, for just as he was landing in New Jersey, the Telstar satellite was being launched into space. As a specialist in speech science and signal processing, Sondhi recognized that a future of satellite communications would require developing a technology to cancel the 600 millisecond signal echo created by the delay of transmission. Although widespread application was long off, Sondhi and a group of signal processing experts at the Labs eventually created the echo canceller that honed satellite transmissions from cacophony to clarity.
To read Man Mohan Sondhi's story in his own words, see Bell Labs Memoirs: Voices of Innovation