In message , at 14:11:24 on Mon, 28 Sep
2020, "Dave Plowman (News)" remarked:
Having used Zoom quite a bit during this pandemic, never quite
understood how they can have reasonable pictures but appalling sound.
But not always - from the same person using exactly the same equipment
as previously.

As I've seen it, the pictures are often static or jerky when coupled
with bad sound.

Sometimes - but not always. Since it is a method of communication, I'd
expect it to be designed so the pictures to disappear before the sound is
effected,

did you mean "affected"?

excepted for total loss of signal.

--
Roland Perry