OPTIMOD-TV DIGITAL
OPERATION
3-39
The
M
ULTIBAND
D
RIVE
interacts with the
M
ULTIBAND
R
ELEASE
. With slower release time
settings, increasing the
M
ULTIBAND
D
RIVE
control scarcely affects density. Instead, the
primary danger is that the excessive drive will cause noise to be increased excessively
when the program material becomes quiet. You can minimize this effect by activat-
ing the single-ended noise reduction and/or by carefully setting the
M
ULTIBAND
G
ATE
T
HRESHOLD
control to freeze the gain when the input gets quiet.
When the release time of the Five-Band compressor is set towards fast, the setting
of the
M
ULTIBAND
D
RIVE
control becomes much more critical to sound quality because
density increases as the control is turned up. Listen carefully as you adjust it. With
these fast release times, there is a point beyond which increasing the Five-Band
compressor drive will no longer yield more loudness, and will simply degrade the
punch and definition of the sound. Instead, let the AGC do most of the work.
Because excessive loudness is an irritant in television audio, there is almost never any
reason to push processing to the point where it degrades the audio. We recommend
no more than 10dB gain reduction as shown on the meters for Band 3. More than
10dB, particularly with the fast release time, will often create a wall of sound effect
that many find fatiguing.
To avoid excessive density with fast Five-Band release time, we recommend using no
more than 5dB gain reduction in band 3, compensating for any lost loudness by
speeding up the
AGC
R
ELEASE
instead.
MB REL
(“Multiband Release”) control can be switched to any of seven settings. To
understand how to adjust this control for television programming, please see the
discussion above under
MB
D
RIVE
.
MB Attack / Release / Threshold
Full Name
Advanced Name
Range
MB REL
Multiband Release
Slow, Slow2, Med, Med2, MFast,
MFast2, Fast
B1 THR
B1 Compression Threshold
–16.00 … 0.0, Off
B2 THR
B2 Compression Threshold
–16.00 … 0.0, Off
B3 THR
B3 Compression Threshold
–16.00 … 0.0, Off
B4 THR
B4 Compression Threshold
–16.00 … 0.0, Off
---
B1 Attack
4.0 … 50.0 ms, Off
---
B2 Attack
4.0 … 50.0 ms, Off
---
B3 Attack
4.0 … 50.0 ms, Off
---
B4 / 5 Attack
4.0 … 50.0 ms, Off
---
B1 Limiter Attack
0 … 100%
---
B2 Limiter Attack
0 … 100%
---
B3 Limiter Attack
0 … 100%
---
B4 / 5 Limiter Attack
0 … 100%
---
B1 Delta Release
–6 … 6
---
B2 Delta Release
–6 … 6
---
B3 Delta Release
–6 … 6
---
B4 / 5 Delta Release
–6 … 6
Table 3-8: MB Attack / Release Controls
Summary of Contents for Optimod-TV 8382
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