Audio Levels for Doc Formats

Elmer_Lang

Elmer_Lang

Well-known member
Hi
Anyone know what the typical audio levels are for docs?

I read where 'most TV networks spec audio levels call for tone at -20 dB and peaks no higher than -12 dB.'

It's from a few years ago. Is that still true? And do festivals, etc have expectations of appropriate levels?

I've made an uneducated guess, but what exactly does 'tone at -20 dB' mean?

best
elmer
 
Tone is a reference signal, typically 1kHz. It is used to calibrate audio systems to make sure everything is consistent, and is usually included with color bars in the headers of the final output. "Tone at -20dB" means the 1kHz tone signal should meter right at -20dB.

As for actual specs, you need to get requirements from your distributor. Whether it's a local broadcaster or a cable network, specs vary a little from place to place and you need to customize your deliverables to the individual outlet. Most have a hard limit on the top end of dynamic range, usually -10dB but sometimes -12dB, though newer digital standards are allowing for some occasional peaks above that.

For theatrical release, it's going to be drastically different because movie theater sound systems are not designed for the louder mix with less dynamic range that one finds in a broadcast mix. Dialog may average between -22dB and -12dB, with the upper end of that range for louder conversations. Sudden peaks (shouts, explosions, crashes) may peak as high as -6dB. Getting a proper theatrical mix, however, is very difficult without a proper mix stage (the treated, calibrated facility used to mix for theatrical release).

So really, there's no "typical" that applies to documentaries. It has to do with the distribution outlet. Where are you planning to send yours?
 
You must log in or register to reply here.
Back
Top