That is why different algorithms are used to compress video signals.
Compression ratio
depending on the algorithm used for compression (MPEG-2, MPEG-4, etc.) can be different.
The required bit rate for MPEG-2 standard used to transfer HD signal is about 20 Mb/s, and
for SDTV, resolution 720 × 576, line is about 4 Mb/s. If we are using the MPEG-4 standard then
for the same quality, twice lower is required signal strength. European broadcasters mainly
use MPEG-2
standard, although lately MPEG-4 standard is increasingly used [5, 6].
Table 2 shows the flows of compressed television signals that
are used in practice in a
broadcast, obtained from the MPEG-2 and MPEG-4 standards.
