Old fashioned color sync data?
On 31 August 2011 17:00, Rieni <[email protected]> wrote:
> **
>
>
> Again, the Tascam stays in sync for at least 30 minutes without
> requiring a Genlock. It's the minimum a device like that should be
> able to do, they are designed for musicians originally and you don't
> want the recording go off-beat by 1/24th of a second after 5 minutes
> already, right? That's what the Zoom does and it's really bad. I'm
> not ditching Zoom though, they make great pre-amps/effect boxes for
> electric guitars.
>
> And all 24fps camera capture at 23.976 fps exactly. Have some trust
> in modern technology please :-)
>
> (could someone pls explain briefly the reason for 23.976 instead of
> 24fps? I keep forgetting)
>
> Rieni
>
>
> At 31-8-2011 17:16, ultravy wrote:
> >The reason is simple - digital devices like cameras, audio recorders
> >etc are driven by a clock called a crystal (or oscillator). These
> >clocks are not perfect, they may run a little slower or faster in
> >one device than in another, and even in different models of the same
> >device. Worse, they often change speed a little with temperature, so
> >they typically will speed a little the longer the device is running.
> >This basically means that all un-synced devices may run at slightly
> >different speeds and will also gradually drift in or out of sync
> >with one another.
> >
> >So an audio recorder recording at 48kHz may actually be recording
> >slightly faster or slower. And a camcorder recording at 24fps may
> >also not be exactly capturing at 24fps. They should both be close,
> >but if you record long enough, they will gradually drift (how much
> >depends on how lucky you are with any two devices).
>
>
>
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