If this level is very close to 0, any unexpected peak in the input signal may cause the level to get above and a very sudden and potentially big volume drop will occur to compensate for it (there are protections built into the algorithm to immediately compensate for these drops, but it's better not to have them in the first place). When changing this setting, you may also need to adjust max amplification.ĭetermines the BS412 level headroom (error margin).ĭetermines how much lower than the level selected in the algorithm should aim. In most countries where BS412 is mandatory, this must be set to 0 dB, but in some it's +3 dB. Use the "Large view" button for a bigger display, which also shows the maximum FM deviation at the bottom (top line is +/- 75 kHz, each horizontal line is 10 kHz less).ĭetermines the maximum BS412 output level. You can see the output for the last 5 minutes, the last hour or the last day. BROWN spikes show the de-basser in action. The actual drop of the highs is less than what is depicted here. YELLOW spikes show that the de-esser reduced loud highs. GREEN/PINK shows short-term volume drops caused by the compressor. In general, it's best if this line doesn't drop below -1 dB - bigger drops can be noticeable. In the graph, you can see lines of different colors: BLACK shows the moving BS412 output level and should be below, but as close as possible to, the 0 dB line.
The pre-drawn horizontal lines are 1 dB apart, the darker line on top is at 0 dB. The BS412 graph shows output and filter effect levels in a single graph. So try to avoid using the equalizer in the Multiband compressor and Bass Boost too much. The BS412 limiter in Stereo Tool knows how to handle increased highs due to pre-emphasis and slightly increased bass because other filters respond less to bass (due to ITU-1770). It does this using 20 different algorithms that predict future input based on previous input, which together decide what to do with the sound to keep it below, but as close as possible to, the threshold.ĭespite of this, you get the best result if the input level is already nearly constant. The BS412 limiter in Stereo Tool attempts to achieve this without compromising the audio quality. This standard demands that the total power over any 60 second period is below a certain threshold. In several European countries, FM stations have to comply to a standard called ITU-R BS.412. This window contains filters to control the output loudness. Limiting and Loudness window - Help - Stereo Tool 6.32 Home Download Donate Register Forums Help
Limiting and Loudness window - Stereo Tool 6.32 - Help
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