User:Retired electrician/x1
From Wikipedia, the free encyclopedia
Alan Dower Blumlein (29 June 1903 — 7 June 1942) was a British electrical and electronics engineer and inventor in the fields of telephony, sound recording and reproduction, television and radiolocation. A long-term leading designer at EMI, Blumlein co-authored the British 405-line television standard; he designed the first BBC Television center at Alexandra Palace and supervised its construction and initial operation. During World War II Blumlein designed ground and airborne radars, and was killed in an air crash testing the prototype of the H2S radar.
In seventeen years of professional work Blumlein patented 128 inventions, including matrix processing of stereophonic sound, Blumlein stereo microphones, the Blumlein transmission line, the ultralinear valve stage, the Miller integrator, the transversal filter,[1][2] and the slot antenna[3]. Blumlein expanded on the theory of operation, and developed practical applications of basic electronic building blocks: the cathode follower, the long-tailed pair, and the negative-feedback amplifier. His works laid the foundation of analogue television, shaping and processing of radar and video signals, and the first generation of British computers.[4] Blumlein is popularly credited as "the father of stereo" for his 1931 invention of the 45/45 phonograph recording principle that became the worldwide standard for stereo LP records in the late 1950s. [5]