Statistical multiplexer
A Statistical multiplexer (or stat-mux) is a device which allows broadcasters to change the bitrate of channels according to those channels' needs.
If, for example, a broadcaster is showing news on Channel 1 and football on Channel 2, with fixed multiplexing each channel has, say, 2 mbit. The news channel is fine – no movement requires very little bandwidth. The football channel however begins to suffer as fast movement and crowd shots require large bandwidth to produce a clear picture. A statistical multiplexer allows the broadcaster to allocate bandwidth to wherever it is needed. Thus 0.5 mbits are allocated to the news amd 3.5 mbits to the football. This results in good a quality picture for both channels. l