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 Bostonians are really, as a race, far inferior in point of anything beyond mere intellect to any other set upon the continent of North America. They are decidedly the most servile imitators of the English it is possible to conceive.”
—Edgar Allan Poe (1809–1845)