The ITU standard concerns Broadcast Loudness and True-peak Level measurement, and the loudness part is based on an Leq measurement employing K-weighting, which is a specific frequency weighting developed by the Communications Research Centre (a federal research institute in Ottawa, Canada). The ITU (International Television Union) BS.1770-3 spec is global and one of the most important broadcast standards as many other standards are based on it. Loudness requirements grew out of recent industry conversations and legislation in Europe and the US seeking to balance levels between programs and commercials.Īdobe Media Encoder supports three standards: In other words, normalization is a single setting applied to an entire clip, while limiting changes the audio levels throughout the duration of the clip. Limiting raises or lowers audio levels on an instant-by-instant basis such that the loudness levels of the clip match the target specifications. Normalization raises or lowers the entire level of a clip by the same amount such that the loudness levels of the clip match the target specifications. If, on the other hand, your audio was not professionally mixed and you want to be safe, then apply these settings. Check with them before applying these settings.
HOWEVER, if your audio has been professionally mixed, the audio engineer probably made sure the final mix met these specs. If your audio is going to broadcast or cable, you care a lot. If your audio is going to the web, you don’t really need to care about this. If you can provide more background, please share it in the comments. NOTE: I don’t presume to be an audio engineer. So, allow me to share some additional information. If you’ve read Adobe’s Help files on this feature, you were probably just as confused when you finished as when you started. One of the new features in Adobe Media Encoder CC is the ability to normalize loudness levels to meet broadcast audio requirements in the US and Europe.
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