Posted by blackburst@aol.com on 10/02/05 13:30

Richard Crowley wrote:
> blackburst wrote ...
> > Well, I do have several credible cases of such drift when dubbing. And
> > I work in a TV station and teach TV production in a college, so I'm no
> > neophyte.
>
> To be sure, there are cases of audio drift. But I have never seen any
> credible evidence that it is due to DV audio being "unlocked". From
> what I have seen here, it is almost always a problem with the capture
> process, primarily using a separate sound card with completely
> unsynchronized sampling.

>From Sony DSR-45 manual (a deck which plays/records both DV & DVCAM),
page 101:

"There are two modes for audio recording: Lock mode and Unlock mode. In
Lock mode, the sampling frequencies of audio and video are
synchronized. In Unlock mode, which the consumer DV format adopts, the
two sampling frequencies are independent. The lock mode maintains high
compatibility with the higher formats (DVCAM) and is more effective
than the unlock mode in digital processing and smooth transition during
audio editing."

The accompanying chart lists DVCAM as Lock mode and DV as Unlock mode.

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