On Sat, Jan 26, 2013 at 09:08:40AM -0800, Len Ovens wrote:
> So with video master the audio clock would be derived from the colour
Video and audio would be derived from a common source, so that any
video pull-up/down is also applied to the audio sample rate.
Frequency standards (GPS, atomic) are not application specific and
usually provide 10 MHz (1 and 5 MHz are also used but less popular).
All serious laboratory measurement equipment (oscillators, frequency
counters, spectrum analysers, digital scopes, ...) accepts 10 MHz as
an external reference, as does most RF equipment. Satellite ground
stations usually derive the hundreds of frequencies they need from
a single 10 MHz reference, etc. It's an industry standard. Deriving
e.g. 48 kHz from 10 MHz is no more difficult or less accurate than
using an exact multiple.
Professional A/V master clocks will accept 10 MHz as one of the possible
> So AES10 (MADI) should be just as free? Or am I missing something? I know
AFAIK there is no license fee for using MADI. The AES wants your credit
card for *everything*, even for papers published 40 years ago ($25 for
non-members, for a download).
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
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