The Natural Philosopher wrote:
Dave Plowman (News) wrote:
In article ,
The Natural Philosopher wrote:
That is due to the TV's internal delays in decoding the digital signal
plus maybe differences in the time the TV's were powered up (not sure
on that last).

nope. Its purely how much buffering they do on the signal. Decoding a
compressed video always takes some time, and to an extent,the more
time it takes the better a job you can do.

Anything digital is always behind real time. Due to the way it is
sampled.
Even digital microphones, compared to analogue ones. Which makes it
impossible to use a mix of the two. Hence there are very few around - the
exception being some radio mics.

And any processing after that initial sampling may slow things down
further.

I am surprised at that because sampling at audio rates needn't introduce
more than a sample period delay.

They must be buffering or compressing somewhere rather than sending the
full bandwidth stream.

Digital radio sends a multiplexed, compressed stream, as does digital
TV. So, yes, it's buffered and compressed. Then buffered again when it's
decompressed, as the playback device needs the entire compressed frame
before it can send the numbers to the output buffer. Digital TV sets
have to compensate for the differing processing delays in audio and
video streams, which is one reason why lipsync is so easily lost in
today's digital video world.

--
Tciao for Now!

John.