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Old 02-22-2013, 09:21 AM
wheresmyfroggy wheresmyfroggy is offline
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Default Re: Discovery Global Tech Spec vers 4.0.

Sorry, no link, but here are the main audio points..

The full mix tracks of the program must have an average loudness level of -24 LKFS/LUFS (plus or minus one dB), as measured using a meter compliant with ITU-R BS.1770-1. If the program has multiple segments, each segment must have an average loudness level of -24 LKFS/LUFS (plus or minus one dB.)
The program must also have consistent loudness levels. Short term loudness levels must not rise more than four dB above or four dB below the average loudness level of the program or program segment.
Short term loudness levels are derived using a continuous sliding window three seconds in duration, as specified in EBU Tech 3341. The short term loudness level for each second is derived by calculating the average loudness level of the past three seconds, as measured using a meter compliant with ITU-R BS.1770-1.
Discovery will not use “dialogue intelligent” meters when evaluating the loudness levels of programs. While speech remains the “anchor element” of Discovery programming (see 2.5.1), Discovery will measure the loudness level of the entire program, not only the sections containing speech.

The peak audio levels on any track in a program must never rise above -2 dBFS, when measured using a True Peak meter compliant with ITU-R BS.1770-1. Production partners should only use audio peak levels above -6 dBFS in small areas of the program and only when needed for impact or emphasis in the audio mix. While digital delivery of television signals allows for high peak levels, older analog systems cannot allow peak levels above -10 dBFS. These older analog systems may use audio limiting to lower peak levels. To avoid the impact of excessive peak limiting production partners should use audio with high peak levels sparingly.
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