I've had that once or twice on one or two programs but I know that the
Freeview box is ok because there's sound on other channels. I think it's
something in the multiplexing equipment that has fallen over.
It's something you have to live with because no-one can be bothered to
monitor the signals, their idea of quality control is that people ring
up and whinge.
Regards Mike.



Mike, you are SOOOOO wrong with that assumption.
The DTT network is the closest monitored system in existance.
I have seen the muliplexing centre at TC and they have huge plasma
screens with a mosaic of all the channels displayed simultaneously. On
each sub-picture is a stereo bargraph showing sound level.

There are also MPEG quality monitors on the Mux outputs to detect
effects which would be noticeable on the picture. (lookup Rohde &
Schwarz DVQ)

In addition to the normal monitoring (using Rohde & Schwarz DVMD's) the
output of all MuxC and D TX's are monitored for the correct PID's being
present 24/7.

Obviously, things go wrong from time to time but the broadcasters could
not be doing any more !

A