The HDTV screen uses a 16:9 aspect ratio. The high resolution images (1920 pixels × 1080 lines or 1280 pixels × 720 lines) allow much more detail to be shown compared to analog television or regular DVDs. MPEG-2 is used as the compression codec. The images are expected to be at least 6 times as sharp as standard definition television or analog television. Like NTSC and PAL, most 1920 × 1080 broadcasts use interlacing to reduce bandwidth demands. Alternating scan lines are broadcast 60 times a second, similar to NTSC's 60 Hz interlacing. This format is entitled 1080i, or 1080i60. In areas traditionally using PAL 50 Hz (1080i50) is also used.
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