Difference between revisions of "NTSC"
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| − | [[Category: | + | [[Category: Hacking Information]] |
| − | Hacking Information]] | + | '''NTSC''' is the analog television system in use in the United States and many other countries, including most of the Americas and some parts of East Asia. It is named for the '''National Television System(s) Committee''', the industry-wide standardization body that created it. |
| − | '''NTSC''' is the analog television system in use in the United States | + | |
| − | and many other countries, including most of the Americas and some parts | ||
| − | of East Asia. It is named for the '''National Television System(s) | ||
| − | Committee''', the industry-wide standardization body that created it. | ||
==Technical details== | ==Technical details== | ||
| − | The NTSC format -- or more correctly the '''M''' format -- consists of | + | The NTSC format -- or more correctly the '''M''' format -- consists of 30/1.001 (approximately 29.97) interlaced frames of video a second, each consisting of 480 lines of vertical resolution out of a total of 525 (the rest are used for sync, vertical retrace, and other data such as captioning). The NTSC system interlaces its scanlines, drawing odd-numbered scanlines in odd-numbered fields and even-numbered scanlines in even-numbered fields, yielding a nearly flicker-free image at its approximately 59.94 Hz refresh frequency. This compares favorably to the 50 Hz refresh rate of the 625-line [[PAL]] and [[SECAM]] video formats used in Europe, where 50 Hz alternating current is the standard; the European standards have noticeably more flicker than NTSC. Interlacing the picture does complicate editing video, but this is true of all interlaced video formats, including PAL and SECAM. |
| − | 30/1.001 (approximately 29.97) interlaced frames of video a second, | + | |
| − | each consisting of 480 lines of vertical resolution out of a total of | + | NTSC was originally a monochrome signal running at 30 frames per second. During the transition from monochrome to color television, certain interference constraints needed to be satisfied among the horizontal, sound, and color frequencies. These constraints were resolved by reducing the 60.00 Hz field rate of monochrome television by a factor of exactly 1000/1001 to create the color NTSC field rate of 60/1.001 Hz (approximately 59.94Hz). |
| − | 525 (the rest are used for sync, vertical retrace, and other data such | + | |
| − | as captioning). The NTSC system interlaces its scanlines, drawing | + | |
| − | odd-numbered scanlines in odd-numbered fields and even-numbered | ||
| − | scanlines in even-numbered fields, yielding a nearly flicker-free image | ||
| − | at its approximately 59.94 Hz refresh frequency. This compares | ||
| − | favorably to the 50 Hz refresh rate of the 625-line [[PAL]] and | ||
| − | [[SECAM]] video formats used in Europe, where 50 Hz alternating current | ||
| − | is the standard; the European standards have noticeably more flicker | ||
| − | than NTSC. Interlacing the picture does complicate editing video, but | ||
| − | this is true of all interlaced video formats, including PAL and SECAM. | ||
| − | NTSC was originally a monochrome signal running at 30 frames per | ||
| − | second. During the transition from monochrome to color television, | ||
| − | certain interference constraints needed to be satisfied among the | ||
| − | horizontal, sound, and color frequencies. These constraints were | ||
| − | resolved by reducing the 60.00 Hz field rate of monochrome television | ||
| − | by a factor of exactly 1000/1001 to create the color NTSC field rate of | ||
| − | 60/1.001 Hz (approximately 59.94Hz). | ||
== Countries that use NTSC == | == Countries that use NTSC == | ||
| − | *All of North and South America, with the exceptions of Brazil and | + | *All of North and South America, with the exceptions of Brazil and Argentina |
| − | + | ||
Asia | Asia | ||
*Japan | *Japan | ||
| − | *Myanmar *Philippines | + | *Myanmar |
| + | *Philippines | ||
*South Korea | *South Korea | ||
*Taiwan | *Taiwan | ||
*Vietnam | *Vietnam | ||
| + | |||
The Pacific | The Pacific | ||
*American Samoa | *American Samoa | ||
| Line 41: | Line 25: | ||
*Fiji | *Fiji | ||
*Guam | *Guam | ||
| − | *Marshall Islands *Federated States of Micronesia | + | *Marshall Islands |
| + | *Federated States of Micronesia | ||
*Midway Atoll | *Midway Atoll | ||
*Northern Mariana Islands | *Northern Mariana Islands | ||
*Palau | *Palau | ||
*Samoa | *Samoa | ||
Revision as of 14:52, 12 December 2004
NTSC is the analog television system in use in the United States and many other countries, including most of the Americas and some parts of East Asia. It is named for the National Television System(s) Committee, the industry-wide standardization body that created it.
Technical details
The NTSC format -- or more correctly the M format -- consists of 30/1.001 (approximately 29.97) interlaced frames of video a second, each consisting of 480 lines of vertical resolution out of a total of 525 (the rest are used for sync, vertical retrace, and other data such as captioning). The NTSC system interlaces its scanlines, drawing odd-numbered scanlines in odd-numbered fields and even-numbered scanlines in even-numbered fields, yielding a nearly flicker-free image at its approximately 59.94 Hz refresh frequency. This compares favorably to the 50 Hz refresh rate of the 625-line PAL and SECAM video formats used in Europe, where 50 Hz alternating current is the standard; the European standards have noticeably more flicker than NTSC. Interlacing the picture does complicate editing video, but this is true of all interlaced video formats, including PAL and SECAM.
NTSC was originally a monochrome signal running at 30 frames per second. During the transition from monochrome to color television, certain interference constraints needed to be satisfied among the horizontal, sound, and color frequencies. These constraints were resolved by reducing the 60.00 Hz field rate of monochrome television by a factor of exactly 1000/1001 to create the color NTSC field rate of 60/1.001 Hz (approximately 59.94Hz).
Countries that use NTSC
- All of North and South America, with the exceptions of Brazil and Argentina
Asia
- Japan
- Myanmar
- Philippines
- South Korea
- Taiwan
- Vietnam
The Pacific
- American Samoa
- Diego Garcia
- Fiji
- Guam
- Marshall Islands
- Federated States of Micronesia
- Midway Atoll
- Northern Mariana Islands
- Palau
- Samoa