Editing EMI (section)

=== Blumlein and radar ===
EMI engineer [[Alan Blumlein]] received a patent for the invention of [[stereophonic sound]] in 1931.<ref name="stereo">{{cite news |title=Early stereo recordings restored |url=http://news.bbc.co.uk/2/hi/technology/7537782.stm |quote=Blumlein lodged the patent for 'binaural sound', in 1931, in a paper which patented stereo records, stereo films and also surround sound. He and his colleagues then made a series of experimental recordings and films to demonstrate the technology, and see if there was any commercial interest from the fledgling film and audio industry. |publisher=[[BBC]] |access-date=7 August 2008 |date=1 August 2008 |archive-url=https://web.archive.org/web/20080807025132/http://news.bbc.co.uk/2/hi/technology/7537782.stm |archive-date=7 August 2008 |url-status=live }}</ref> He was killed in 1942 whilst conducting flight trials on an experimental [[H2S radar]] set.

During and after [[World War II]], the [[EMI Laboratories]] in [[Hayes, Hillingdon]] developed [[radar]] equipment (including the receiver section of the British Army's GL-II anti-aircraft fire-control radar), microwave devices such as the [[klystron|reflex klystron]] oscillator (having played a crucial role in the development of early production types following on from the British Admiralty Signal School's pioneering NR89, the so-called "Sutton tube"), electro-optic devices such as infra-red image converters, and eventually [[missile|guided missiles]] employing analogue computers.