Henri de France
Henri Georges de France ( born September 7, 1911 in Paris, † April 29, 1986 in Paris) was a French engineer and television pioneer.
Black and White TV
Henri de France founded on 6 December 1931, the Compagnie Générale de Télévision in Le Havre and presented there a functional 60 -line television system. In February 1932 he had a long-distance transmission of moving images: From the nearby station of Fécamp he sent 38 -line images on medium wave, who were to receive 500 km. In October 1932, the system Henri de France then offered 120 lines of resolution, which have now been sent to 30 MHz, at the upper end of the short- wave range and consequently were not enough so far. In 1936, the company Cahen de France, where he initially sent his 120 -line images. In the laboratory, but he has experimented with 405 lines on a 21 x 24 cm big screen, from which the French pre-war standard was created with 455 rows.
High-definition television
From about 1940 de France is working on a high definition television system, which should provide the former standards of 405, 441 or 455 lines clear why he went to the still unoccupied Lyon. In the monthly magazine T.S.F. pour nous, a magazine for professional radio engineering, issue August 1942, he presented a television system with 767 lines. By 1947, he developed it to that 819 -line system further, which was introduced in 1949 in France.
Color television
In 1954 the NTSC color television was introduced in the United States. In order to eliminate the distinct disadvantage of NTSC, the color changes on the transmission, de France developed based on a new system (SECAM ), whose patent he filed on May 25, 1956. 1959 SECAM was officially launched, and on October 1, 1967, the transmission operation began only in 1964 in color on the upper of the second baptism French TV Channel (now France 2 ).
In addition to the television technology Henri de France was also working on radar technology.
Awards
- Médaille de la Résistance
- Officer of the Legion of Honor