play speed settings

I can change the play speed setting on my DVD to 0.8, 0.9, 1.0 (default),
1.2 and 1.4. The amazing thing is that there is no change in pitch of the
audio. The actors' movements look artificial in slower or faster speeds, but
the speech, singing and orchestra playing sound completely natural. How do
they do that? I suppose in faster speeds they can skip a few digital bits,
but how can the DVD make singers and orchestra stretch notes without
affecting pitch? Does it replicate every fifth-or-so digital bit? - Noam

Noam

Noam wrote:
> I can change the play speed setting on my DVD to 0.8, 0.9, 1.0 (default),
> 1.2 and 1.4. The amazing thing is that there is no change in pitch of the
> audio. The actors' movements look artificial in slower or faster speeds, but
> the speech, singing and orchestra playing sound completely natural. How do
> they do that? I suppose in faster speeds they can skip a few digital bits,
> but how can the DVD make singers and orchestra stretch notes without
> affecting pitch? Does it replicate every fifth-or-so digital bit? - Noam

If you'll notice you're not hearing the whole soundtrack being
compressed, rather pieces of it are snipped out in time with the
fast-forwarding. By the same token you won't see each frame when you
fast-forward, you'll only see chunks.

--

"If you examined a hundred people who had lost their faith in
Christianity, I wonder how many of them would turn out to have reasoned
out of it by honest argument? Do not most people simply drift away?"

--C.S. Lewis

Grand Inquisitor

> > I can change the play speed setting on my DVD to 0.8, 0.9, 1.0
(default),
> > 1.2 and 1.4. The amazing thing is that there is no change in pitch of
the
> > audio. The actors' movements look artificial in slower or faster speeds,
but
> > the speech, singing and orchestra playing sound completely natural. How
do
> > they do that? I suppose in faster speeds they can skip a few digital
bits,
> > but how can the DVD make singers and orchestra stretch notes without
> > affecting pitch? Does it replicate every fifth-or-so digital bit? -
Noam
>
> If you'll notice you're not hearing the whole soundtrack being
> compressed, rather pieces of it are snipped out in time with the
> fast-forwarding. By the same token you won't see each frame when you
> fast-forward, you'll only see chunks.

How about the 0.8 and 0.9 (slower) speeds? - Noam

Noam