The high resolution HD signal as defined by the Advanced Television Standards Committee (ATSC) is the 1080 line format, which is 1920 by 1080 with an aspect ratio of 16:9. Images can be interlaced or progressively scanned. Most equipment designated as recording in the 1080 format actually only captures 1440 × 1080 due to sub sampling of the signal. Cameras or VTRs recording 1080 interlaced signals use the letter “i” after the frame rate to designate interlaced recording. Differences between PAL and NTSC frame rates are maintained when recording a 1080 interlaced signal. PAL countries use 1080/50i (25 fps) and NTSC countries, 1080/60i (30 fps)
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