North America
Field tests in Los Angeles on various line systems began in 1936, and North America had adopted RCA's 441-line system by 1938. The following year the first TV receivers were sold on a very limited basis, mostly in New York, the new system being publicly launched by NBC during the New York World's Fair in April 1939. Its manufacturers included RCA, General Electric, DuMont, and Andrea. Following a decision of the NTSC (National Television System Committee), the 525 line System-M replaced the 441 line standard on July 1, 1941.
| System | Lines | Frame rate | Channel bandwidth (in MHz) | Visual bandwidth (in MHz) | Sound offset | Vestigial sideband | Vision mod. | Sound mod. |
|---|---|---|---|---|---|---|---|---|
| 441 lines | 441 | 30 | 6 | 2.8 | 3.25 | Neg. | AM |
Read more about this topic: 441-line Television System
Famous quotes related to north america:
“The Anglo-Saxon hive have extirpated Paganism from the greater part of the North American continent; but with it they have likewise extirpated the greater portion of the Red race. Civilization is gradually sweeping from the earth the lingering vestiges of Paganism, and at the same time the shrinking forms of its unhappy worshippers.”
—Herman Melville (1819–1891)
“We might hypothetically possess ourselves of every technological resource on the North American continent, but as long as our language is inadequate, our vision remains formless, our thinking and feeling are still running in the old cycles, our process may be ‘revolutionary’ but not transformative.”
—Adrienne Rich (b. 1929)
“The North American system only wants to consider the positive aspects of reality. Men and women are subjected from childhood to an inexorable process of adaptation; certain principles, contained in brief formulas are endlessly repeated by the press, the radio, the churches, and the schools, and by those kindly, sinister beings, the North American mothers and wives. A person imprisoned by these schemes is like a plant in a flowerpot too small for it: he cannot grow or mature.”
—Octavio Paz (b. 1914)