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What is the refresh rate for picture elements in a North American TV picture?
Wiki User
∙ 13y ago
North America uses 60Hz field rate for television pictures. For those who want to be really picky it's actually 59.94Hz. That very odd rate comes from the early days of television where timing circuits were far easier to build at 59.94Hz rather than 60Hz. Although that technical restriction is long gone, the field rate remains the same.
The filed rate means that every 60th of a second, one field is displayed. A field is half of a full image and will contain only odd line numbers or only even line numbers. Two fields will produce a complete frame 29.97 times every second. This display method is called interlaced. It is denoted by the "i" in 1080i, 480i etc.
Two HD television formats display a complete image with each field. 60 times every second, all line numbers are displayed one after the other. This is known as progressive scanning and is denoted by the "p" in 720p and 1080p for example.
The other rate that is found occasionally is 24Hz as a progressive scan, This is used for transferring film to video and can sometimes be found on discs. It is never used as a broadcast rate and is normally confined to television production facilities. Normally, if a film is transferred to video for broadcast, a technique called 3-2 pull down is used, This takes one frame of a film and uses it to create three fields of a TV picture. The next frame of the film will generate two fields of the TV picture. The process will repeat, creating three and then two fields for each of the film frames. This generates a 60Hz field rate while retaining the original speed of the film.
The other television rate, found in Europe and other parts of the world is 50Hz field rate and 25Hz frame rate.
Wiki User
∙ 13y ago
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