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Help! TV delivery specs question
Just a question from a newbie trying to understand audio level delivery specs for TV.
I'm mixing a short film and the requested delivery specs from the TV company is as follows: a 1kHz sine wave at -20dBFS signal shall be used as the audio alignment signal level. This is equivalent to 0 VU, 1kHz in the NTSC analog standard master tapes with two-channel full stereo: channel 1 (Lo/Lt left) and channel 2 (Ro/Rt right). Audio channels must be phase coherent within 15 degrees at 10kHz If anyone would be so kind as to explain this in layman's terms and what I should be using in Pro Tools to figure this out: Master Fader peak, phasescope, maxim etc. I know this should be fairly straightforward, but for some reason I just can't grasp it. cheers. |
#2
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Re: Help! TV delivery specs question
You have received a spec which is not very modern, or was written assuming you are a caveman. That doesn't make it bad, that just means it is from 5 or more years ago.
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Re: Help! TV delivery specs question
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Re: Help! TV delivery specs question
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There are different kind of meters shown in phase scope, VU, BBC, DIN, etc. I don't think they have the same dynamic range, should they have different references? Also, what is the average level of LEQ meter? I always find out that when the mixing level is around -10db, the LEQ meter only shows up around -20, why? |
#5
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Re: Help! TV delivery specs question
-10 is peak, -20 is RMS.
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Re: Help! TV delivery specs question
Hey critictalk,
First, I hope you are aware of the difference between peak levels (you say "-10") and averaged or rms levels (you say "-20"). If not, have a look here for some basics: http://myhometheater.homestead.com/rms.html Our ears act much more like RMS meters than peak meters (a VU meter is like an RMS meter). I think you can benefit from some reading about what loudness measurements are and why our industry has begun to adopt them so much. An "leq meter", as you called it, has an rms meter at it's core. While an leq meter is not the same as rms meter, it is designed to http://tech.ebu.ch/docs/techreview/t...ss_Camerer.pdf I'm not sure if you'll understand every detail on first read-through, but it totally covers your questions. You are asking about an "leq meter". In that document look for "LUFS" (same thing as "LKFS") meter, which is a currently accepted type of "leq meter". The article's writer has a European background, so some terms may not be familiar. When he says "quasi peak" meters, realize those are another form of peak meter (not equivalent but similar). Your -10 readings came from a peak meter, I believe. Good luck, this is technical stuff that is very important for broadcast, and not as important for film work. |
#7
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Re: Help! TV delivery specs question
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Thx for your help |
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