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Strictly speaking, a TV receiver is the device that decodes a transmitted signal but it's safe to assume that the question refers to a television or monitor.

Conventional televisions have an aspect ratio of 4 : 3, that is the width is 4 units wide compared to the height which is 3 units wide. Widescreen televisions have an aspect ratio of 16 : 9.

16 : 9 is the only aspect ratio for HD television. In North America, SD television is 4 : 3 only. In Europe however, 16 : 9 became the norm for standard definition television some years ago. Television broadcasts have now moved exclusively to a widescreen format even if they are in SD.

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