Gerhard Fiedler writes:
> This probably makes in not suited for TV, right? Sometimes there is a
> channel with audio and video slightly out of sync, and it seems it's less
> than 1/4 second that can create this out-of-sync feeling.

	Yes.  With video, games or a situation in which your own
voice might come back to you such as using the headset to monitor
audio you were recording with a microphone, you would find it
disconcerting.

	Back in the eighties when I was a service technician with
our Audio Visual department, we used to get complaints that the
sound and picture on some 16-millimeter films were out of sync.
The trouble would turn out to be that the person operating the
projector had pulled too much film for the bottom loop which had
the effect of making the sound pickup optics too far away from
the film gate where the picture is actually projected.  This
couldn't have been more than a few frames off, but people notice
these things.  A frame represents 1/24 of a second.
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