Free cam 60


10-Oct-2018 15:42

The NTSC selected 525 scan lines as a compromise between RCA's 441-scan line standard (already being used by RCA's NBC TV network) and Philco's and Du Mont's desire to increase the number of scan lines to between 605 and 800.The standard recommended a frame rate of 30 frames (images) per second, consisting of two interlaced fields per frame at 262.5 lines per field and 60 fields per second.North America, parts of Central America, and South Korea are adopting or have adopted the ATSC standards, while other countries (such as Japan) are adopting or have adopted other standards instead of ATSC.After nearly 70 years, the majority of over-the-air NTSC transmissions in the United States ceased on January 1, 2010, After a pilot program in 2013, most full-power analog stations in Mexico left the air on ten dates in 2015, with some 500 low-power and repeater stations allowed to remain in analog until the end of 2016.The first NTSC standard was developed in 1941 and had no provision for color.In 1953 a second NTSC standard was adopted, which allowed for color television broadcasting which was compatible with the existing stock of black-and-white receivers.However, some of these lines may now contain other data such as closed captioning and vertical interval timecode (VITC).

The precise frequency was chosen so that horizontal line-rate modulation components of the chrominance signal fall exactly in between the horizontal line-rate modulation components of the luminance signal, thereby enabling the chrominance signal to be filtered out of the luminance signal with minor degradation of the luminance signal.These changes amount to 0.1 percent and were readily tolerated by existing television receivers.The first publicly announced network television broadcast of a program using the NTSC "compatible color" system was an episode of NBC's Kukla, Fran and Ollie on August 30, 1953, although it was viewable in color only at the network's headquarters.With the advent of digital television, analog broadcasts are being phased out.