Digital Signal Processing Reference
In-Depth Information
There is, however, still a large gap between the 124.5 Mbit/s now
achieved and the required 2...6 Mbit/s with its upper limit of 15 Mbit/s,
and this gap needs to be closed by means of further steps which are much
more complex.
255
0
time
ts
Fig. 7.6.
Pulse Code Modulation
255
0
time
ts
Fig. 7.7.
Differential Pulse Code Modulation
7.1.5 Differential Pulse Code Modulation of Moving Pictures
Adjoining moving pictures differ only very slightly from each other. They
contain stationary areas which won't change at all from frame to frame;
there are areas which only change their position and there are objects
which are newly added. If each frame were to be transmitted completely
every time, some of the information transmitted would always be the same,
resulting in a very high data rate. The obvious conclusion is to differentiate
Search WWH ::
Custom Search