Algorithm Manual Revision 4
Table Of Contents
ALC 6
168 System 6000 MKII Algorithms – Firmware version 6.5.0
ALC6 – main page
Fig 1. TC Icon view of ALC6
Main page parameters.
Preset title
The Main page of any algorithm in DB4 and
DB8displays the title of the current preset. Click
on the Name field to edit a preset title, and Store
the changes if you wish to keep them.
Input Level
Input gain applied to all 5.1 channels before
loudness detection or processing is applied.
The range of the Input Level parameter is -18 to
+18 dB. Because DB4 and DB8 use 48 bit pro-
cessing, a positive Input gain does not create
overload, even if the input signal is already at
full scale.
Delay
Time alignment of all 5.1 channels at 24 bit
resolution. The delay function makes use of si-
lent update technology, so adjustments may be
performed live on air. Minimum latency through
ALC6 is 0.8 ms. An additional delay of up to 1
second may be added using this parameter.
Delay Unit
Sets the unit used to display delay time, frames
or milliseconds (30 frames, 25 frames, 24 frames,
milliseconds).
ALC6 – setup page
Fig 2: ALC6 algorithm – setup page
Channel Weighting
Sets the weighting of each Main channel to the
loudness measurement.
BS.1770 specifies the front channels to be set at
0.0dB, and the surrounds at +1.5dB. In case the
ALC Target parameter is set to Downmix, the pa-
rameters in these fields reflect the downmix co-
efficients used for the adjustment calculations.
LFE Weighting
Determines whether the LFE channel should
contribute to the loudness measurement or not.
According to BS.1770, the LFE should not con-
tribute. However, the debate is on, and the rec-
ommendation might change. If you find that
commercials start using unexpectedly high LFE
level, you may wish to bring LFE into the equa-
tion. ALC6 enables you to stay flexible on this
issue.
LFE Process
Determines if dynamic LFE gain correction fol-
lows the Main channels or not.
Mode
When listening to a 5.1 program in 5.1 or as a
downmix, the loudness is typically not the same.
Use this novel parameter to optimize compliance
for 5.1 or for Stereo downmix, depending on leg-
islation or on the number of expected listeners
using either loudspeaker configuration.