[Tig] Digital cinema
Micheletti, Bob NBC Universal
Thu Mar 30 21:13:33 BST 2006
Thanks to oktobor for supporting the TIG
I have always wondered how a 22khz sine wave can be sampled at
44khz and reproduced as a sine wave not a square wave.
Or even worse a 21.9khz sine. I have been told it is simulated
with filtering. I have always felt that high frequencies
reproduced from a CD were harsh sounding I assumed this was due
to the lack of samples per wave causing harmonics. Can anyone
help me understand this process.
Don't get me wrong, I have given up on my vinyl and love the convenience
of CDs. And to get back on subject...I am deep into setting up a
workflow to generate DCPs of trailers for Digital Cinema. This
transition is after 25 years in the film business. As much as I
love film it is inevitable that for the masses digital cinema is the way
of the future and can present a much better experience. I hope it
will not head down the same path as digital audio (Itunes) but will
continue to improve and perhaps become better than a pristine film print.
My first problem with the DCI spec is that the idea of 2048 (4096) pixels
across matching the S35 scan resolution. This overlooked the fact that
2048 in the camera aperture scan width not the projected image width.
This means an S35 scan needs to be blown up 4.5% digitally to match
the film print. There is those darn aliasing and rounding errors fed
through a filter again!
From: Adrian Thomas [mailto:adrian at autotv.co.uk]
Sent: Thursday, March 30, 2006 1:29 AM
To: Micheletti, Bob (NBC Universal)
Subject: Re: [Tig] Digital cinema
Aliasing, while a feature of all band-limited digital sampling
systems, is not a significant problem with CD-Audio.
London WC2N 4DU
On 29 Mar 2006, at 18:28, Micheletti, Bob ((NBC Universal)) wrote:
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