Alan Blumlein
Alan Dower Blumlein (* 29. June 1903 in Hampstead (London) , United Kingdom ; † 7. June 1942 in London ) was a British electrical engineer who many inventions in communications technology , in the sound recording in which Stereofonie , the record , the TV and radar . He obtained 128 patents.
Life
His career aspirations seem to have been established at the age of seven when he amazed his mother with a bill for the repair of the doorbell, which was signed "Alan Blumlein, electrical engineer". After enrolling at Highgate School in 1921, he studied at City and Guilds College, which was part of Imperial College . He obtained a "Governor's scholarship" and was able to jump straight into the second year of the course. Two years later he graduated with "first class honors B.Sc." On June 7, 1942, he died during an attempt with scattered H2S radar . The Halifax bomber he had flown crashed and everyone on board died.
Developed by Alan Blumlein already around 1931, but until 1957 marketed by EMI edge writing the stereo gramophone allowed mono-compatible stereo tracings. The sound information for the left and right channels is impressed on the 45 ° flanks of the groove. The left channel is saved in the inner flank, the right channel in the outer groove flank. The direction in which the cutting stylus is deflected is selected in such a way that a mono signal that is recorded with a stereo cutting head generates page writing. This ensures downward compatibility with mono systems. The important ultralinear circuit of tube power amplifiers in tube amplifiers also goes back to his patent (UK patent number 496,883) from 1938.
A classic stereo recording method (Blumlein stereo microphone and the Blumlein microphone method ) with two crossed figure-eight microphones and an axis angle of 90 ° was also developed through this stereo record theory ; a popular design for coincidence microphones (compact stereo microphones).
Another invention of his was the Blumlein generator named after him, an electrical pulse generator for generating short, powerful pulses.
literature
- Robert Alexander: The Inventor of Stereo: The Life and Works of Alan Dower Blumlein . Focal Press, ISBN 0-240-51628-1
- Russell W Burns: The Life and Times of AD Blumlein . IEE History of Technology series. 2000, ISBN 0-85296-773-X
Web links
Individual evidence
- ↑ patent GB589127 : Improvements in or relating to apparatus for generating electrical pulse. Registered October 10, 1941 , published June 12, 1947 , Applicant: Alan Dower Blumlein.
| personal data | |
|---|---|
| SURNAME | Blumlein, Alan |
| ALTERNATIVE NAMES | Blumlein, Alan Dower (full name) |
| BRIEF DESCRIPTION | British inventor |
| DATE OF BIRTH | June 29, 1903 |
| PLACE OF BIRTH | London |
| DATE OF DEATH | June 7, 1942 |
| Place of death | London |