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TA0310

Video signal bandwidth versus resolution

Progressive Video (PV):

The image is not interlaced. The aim is to increase its quality. The bandwidth of this signal is twice the

standard definition bandwidth, 12MHz. Such a signal fits with progressive TVs, 720*480 pixels (type:

480P) and it in increasingly common in DVD players. However, because of competition with 100Hz TVs,

this format is not popular in Europe yet.

High Definition (HDTV):

The goal is to improve the definition of the image by increasing the quantity of lines and pixels per line.

The bandwidth of the video signal is up to 30MHz and the signal fits with TV screens of progressive

1280*1920 pixels (type: 1280P) and interlaced 1920*1080 pixels (1080I). HDTV is now popular in the

USA, and is starting to become so in Asia and Europe.

Figure 4: Video spectrum for Progressive video

Figure 5: Video spectrum for HDTV

12MHz

1Vp-p

Amplitude

Frequency

30MHz

Frequency

1Vp-p

Amplitude