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Will a HDTV with 120Hz blur the picture of regular cable broadcast?
Wiki User
∙ 13y ago
Generally, a 120Hz display will not blur images of any content. However, all incoming video signals are 60 Hz, whether from cable, terrestrial or disc. The 120Hz display is generated by taking the 60Hz signal and adding a new image between each of the incoming frames or fields. The process takes a great deal of computing power to work out what the intermediate image would be like if it had been captured by the camera. The process is known as temporal interpolation and has been around for 30 years or more. Even though the technology has been with us for 3 decades, it is still not an exact science and there can be occasions when the incoming signal can fool the processor. When it happens, there may be a visible judder in the image or small details in the picture may be lost completely.
In almost all models of television, the 120Hz feature can be turned off if the content is not helped by the frame doubling circuitry.
As a final note, 60 and 120Hz are the frequencies used in North America. Europe uses 50Hz so a frame doubling model in Europe will be advertised as a 100Hz display.
Wiki User
∙ 13y ago
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