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OPTIMOD-PC
Adjusting MB L
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
controlled audio.
b) In D
IRECT
controlled audio to the negative of the setting of the Output Level control
associated with the active output. For example, if D
output you are using and you set it to –2 dB, in D
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
I
G
NPUT
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
D
M
IRECT
drop-down to P
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
(15 kHz), and H
L
OWPASS
global values in the active Transmission Preset.
The filter settings complement analog aural carriers, while the value of D
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
D
changes the Loudness Level meter's indication
IMITER
RIVE
M
#1, mute all inputs except for the source of the loudness-
IXER
#1, set the fader carrying the source of the loudness-
M
IXER
control in the C
AIN
ONFIGURATION
1. To activate processing set the Digital 1 S
IXER
M
ROCESSOR
(20 Hz). These values override the corresponding
IGHPASS
IRECT
tab of the I/O Mixer to +12. Note
R
IGNAL
OUTE
P
-L
. You can automate these
IXER
OST
IMIT
INSTALLATION
is the
1 O
IGITAL
UTPUT
1 set the fader
M
IXER
AXIMUM
drop-down to
F
ROM
R
F
IGNAL
OUTE
ROM
(–17 dB),
IALNORM
IALNORM
O
IGITAL
UTPUT
2-29
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