OPTIMOD-PC
INSTALLATION
2-29
Adjusting MB
L
IMITER
D
RIVE
changes the Loudness Level meter’s indication
and the amount of gain reduction in the loudness controller and peak
limiter.
F)
Set bypass gain (optional).
EBU Recommendation R 128 requires online loudness controllers to be
defeatable so that they do not change the dynamics of upstream material
that is known to meet the R 128 requirement: the loudness of each pro-
gram segment must be within a
±
1 LU window centered on the active
Dialnorm value. This measurement must be done over the entire program
segment using a BS.1770-2 “integrated” measurement.
Defeating OPTIMOD-PC processing is most easily done by assigning the
output of either Direct Mixer to the active output. In the following in-
structions it is assumed that the desired bypass gain is unity (0 dB).
You may use either Direct Mixer; these instructions assume that you are
using Direct Mixer #1 and that the input is in digital form, either from
one of OPTIMOD-PC’s hardware AES3 inputs for from one of its WAVE
inputs.
a)
In
D
IRECT
M
IXER
#1
, mute all inputs except for the source of the loudness-
controlled audio.
b)
In
D
IRECT
M
IXER
#1,
set the fader carrying the source of the loudness-
controlled audio to the negative of the setting of the Output Level control
associated with the active output. For example, if
D
IGITAL
1
O
UTPUT
is the
output you are using and you set it to –2 dB, in
D
IRECT
M
IXER
1
set the fader
carrying the source of the loudness-controlled audio to + 2 dB.
To achieve gains higher than 0 dB in the Direct Mixer, set the M
AXIMUM
I
NPUT
G
AIN
control in the C
ONFIGURATION
tab of the I/O Mixer to +12. Note
that clipping can occur with gains above 0 dB. In this example, the peak
value of the input signal must constrained to –2 dBfs to prevent clipping.
c)
To defeat processing, set the Digital 1
S
IGNAL
R
OUTE
F
ROM
drop-down to
D
IRECT
M
IXER
1.
To activate processing set the Digital 1
S
IGNAL
R
OUTE
F
ROM
drop-down to
P
ROCESSOR
M
IXER
P
OST
-L
IMIT
.
You can automate these
selections via OPTIMOD-PC’s API. See Table 6-2 on page 6-5.
7.
Set digital configuration and output level when driving an analog tele-
vision transmitter.
[Skip this step if you are not driving an analog television transmitter.]
We recommend using 5-Band “TVA” presets (or User Presets derived from them)
when feeding an analog TV aural channel using 50us or 75us preemphasis. To
simplify setup, the “TVA” presets have local values of
D
IALNORM
(–17 dB),
L
OWPASS
(15 kHz), and
H
IGHPASS
(20 Hz). These values override the corresponding
global values in the active Transmission Preset.
The filter settings complement analog aural carriers, while the value of
D
IALNORM
matches the loudness of the processing to the loudness of an Optimod-TV de-
signed for analog television (like Optimod-TV 8282 and 8382) when the peak
output levels of the two processors are the same and when the
D
IGITAL
O
UTPUT
Summary of Contents for Optimod-PC 1101
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