Audio loudness/normalisation
Hi guys,
Quick question (I hope). I've just finished producing my first TV commercial. I'm trying to get my head around the broadcaster requirements for audio loudness. The standards I need to adhere to are: loudness must be normalised to -24LKFS, and measurements should be to ITU BS.1770-3 standard. So, does this mean (using Avid) if I normalise to -24dB I should be safe? Or is it not quite that simple? Thanks for any info. |
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You *have* to have a loudness meter to the new standard to do all this as the standard is averaged over the programme and not instantaneously. You will need the loudness meter plug-in for the Avid if you have an old version without the Loudness Meter. A current Loudness Meter will also normally display to LKFS as well as the standard LUFS if you desire the old standard. |
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The standard is still -24LKFS here in NZ..
Maybe we're behind the times a bit? This is straight from the technical requirements document from the Commercials Approvals Bureau: "The audio loudness of a commercial must be normalised to -24LKFS. Measurement should be to ITU BS.1770-3 standard and related documents.". So, is there any way to tell which standard my version of Avid is using? The basic audio monitoring tool doesn't seem to have a function to record the average loudness, only peak. Honestly, I don't have a lot of experience with audio normalisation, especially for broadcast. So any tips are appreciated. |
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Jody, I am in NZ. Where will I see your commercial?
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One further question - I got a metering plugin for Avid which measures LUFS. Is this going to be suitable or do I need a specific LKFS plugin? |
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Pretty sure -24 LUFS should be ok, as these days it's pretty much the same standard as LFKS.
Not sure how you are doing your audio compression/limiting...but essentially you need to compress till your audio averages out at -24, and use a limiter to keep peaks below -9. |
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Hmm well to this point I've just been doing it by ear and trying to keep the peaks below -9. But I'll have a look into using a limiter, thanks. |
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I worked in broadcast a while back doing QC, so hopefully I can remember enough of that to get it right. Would rather do it myself and learn from any mistakes I make, so I'm sorted for next time. Thanks again :) |
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Since nobody has explictly said:
dBFS and LUFS are completely different units, metered measured in completely different ways: apples and oranges. Not to be confused. |
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What would be the acceptable peak level for web video and DVD/BluRay discs. at the moment I am working to -6db
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