Manual

(b) Algorithm Settings Clicking on this button opens up another display where you
can tweak the values of the selected algorithm. Note that if you adjust any of
these values then the Algorithm setting in the main page will display ’custom’.
i. Short Term Sliding Window This is the period over which the short-term
loudness is calculated. You should only change this if your delivery specifically
states a different value.
ii. Algorithm This is the actual algorithm to use.
iii. Channel weight L/R Rear Surround This is the channel weighting that
should be assigned to the rear/additional channels in a 7.1 mix. At the time
of writing, there was no formal specification for the weighting that should be
used in these channels and the weighting is therefore configurable for forward
compatibility. The weighting is listed as a dB offset.
(c) Limiter With this option turned on, a look-ahead True-Peak limiter is applied to
the audio to make sure that the specified MaxTP is not exceeded. If this option
is turned off, but the MaxTP criterion is still set then the incoming audio will be
gain-adjusted to make sure that peak-overs do not occur.
(d) Limiter Settings
i. Look Ahead. This is the number of samples to look ahead for peak-overs.
The larger this value is, the smoother gain adjustments prior to a peak-over
will be.
ii. Release This is the time in milliseconds over which the gain adjustment is
released. The larger this value is, the smoother gain adjustments after a
peak-over will be.
(e) Ignore Head. Use this parameter to cause AMB to ignore the front section of
audio in a given file. This is useful where test and alignment tones are present,
which should not be included in the loudness measurement. This section of the
file is also left out of any file processing adjustments made.
(f) Integrated Loudness. Files will be assessed and or corrected to the defined
value. In some situations, it can be possible for a file to fail to comply with a
single target value, as other requirements require gain reduction that reduces
the integrated loudness below the target. In these situations, AMB will indicate
that this condition has not been met.
i. Tolerance. The +/- parameter allows a tolerance to be applied, passing audio
within the tolerance range.
ii. Allow Under. The Allow under option will allow the integrated value to be
reduced in order to meet potential conflicts arising from the need to meet the
max parameters settings below if selected.
iii. Allow Correct Up. Allow correct up will raise the level of audio with integrated
loudness outside the integrated loudness value.
(g) Max True-Peak. Sets the target value for maximum True-Peak level. Overall file
level will be reduced to ensure this target value is not exceeded. As extremely
short sections of audio can cause the reduction in level of the entire file a
back-stop peak-limiter option is available as an alternative method of preventing
Max True-Peak being exceeded.
(h) Max Momentary Loudness.
3
Sets the target value for MaxM. Overall file level
will be reduced to ensure this target value is not exceeded. This setting is
unavailable if DynApt™ is turned on - use the Max Momentary Above Int option
instead.
3
This applies a simple gain offset which may conflict with the Integrated Loudness correction. To correct for
both Integrated and Short-term/Momentary values use the DynApt™ extension.
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