RFC 3550 states that the jitter SHOULD be
calculated continuously as each
data packet i is received. The standard
deviation is basically a block calculation,
although it can be computed
recursively using buffers.
The method proposed in the RFC is a
simple 1-lag IIR smoothing filter
with an empirically set decay time.
Although I personally
wouldn't have used the wording "optimal first-order
estimator",
it certainly is the most straightforward way to compute a
time-averaged jitter
value.
In any case, why do you want to compute PDV if your
problem is
packet loss rate ? The jitter is an additional characteristic,
and
shouldn't directly effect "network quality" (e.g. perceived audio
quality)
unless there are large PDV swings, causing jitter buffer over- or
under-flow
and hence "internal" packet
loss.
Y(J)S
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