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How make a audio -20dbfs

May 6, 2013 2:44 PM



Is the audio VU in Premiere CS6 in DBFS?


The TV station ask me for a -20dbfs audio, how I visualize correctly in the VU?




  • Currently Being Moderated
    May 6, 2013 5:03 PM   in reply to Allbyc

    The Master is measured at 0dBFS.  To have it peak at -20 dBFS, adjust the Master in the Mixer to -20.


    Also, take a look at what's coming...


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  • Currently Being Moderated
    May 7, 2013 2:58 AM   in reply to Jim Simon

    The -20 dBfs is most probably the reference level. This is the level you would put a 1kHz tone at. However, typically audio peaks to 8dB above reference level, which in your case means audio should not exceed -12dBfs. However you had better check exactly what the TV station expects. They should have a technical spec which will explain what they expect in terms of levels.

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    May 7, 2013 3:16 AM   in reply to Allbyc

    Allbyc > do you mean they ask you to include a -20 dBfs reference in your program ?

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    May 7, 2013 3:35 AM   in reply to Allbyc

    Peak at -20 dBfs ? odd, that's very low.


    Anyway if you want to get precise control over your mean and peak levels you should do the mix in Audition. As Jim said the next version will get a killer tool for audio metering but it isn't there yet.

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  • Currently Being Moderated
    May 7, 2013 3:51 AM   in reply to KGCW

    Allbyc, please re-read what I said in #2 above. You have misunderstood. The following is how the BBC and others do it.



    This is an extract;


    3.1.1 Stereo line-up tones

    All stereo tracks must use EBU 1kHz tone (left ident). All tones must be sinusoidal, free of distortion and phase coherent between channels.

    Digital Audio Reference level is defined as 18dB below the maximum coding value (-18dBFS) as per EBU recommended practice R68.


    3.1.2 Stereo audio levels and measurement (loudness or volume)

    Stereo programme audio levels are currently measured by Peak Programme Meters (PPM). The Maximum or Peak Programme Level must never exceed 8dBs above the programme’s reference level.


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  • Currently Being Moderated
    May 7, 2013 4:48 AM   in reply to Allbyc

    What they're asking you is to include a reference most probably at the beginning of your program.


    Premiere Bars and Tone have a stereo 1 kHz sine wave at -12 dBfs.


    Right click in your project panel and select New Item > Bars and Tone.


    Once it's created right click on it and select Modify > Audio Channels and configure it like this :


    Capture d’écran 2013-05-07 à 13.45.20.png


    Then right click on the Bars and Tone clip again and select Audio Gain, then lower it by 8 dB :


    Capture d’écran 2013-05-07 à 13.47.14.png

    You got your reference colorbars with four channels of 1 kHz sine at -20 dBfs.

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