Table of Contents
Advertisement
3-10
OPERATION
About OPTIMOD-PC's Signal Processing Features
Dual-Mono Architecture
Audio Processing Signal Flow
B) Edit AGC parameters of the OPTIMOD-PC preset so they are the same as the
AGC parameters on-air at the transmitter-side Optimod. Then save your work
as an OPTIMOD-PC User Preset.
If you use more than one preset in the transmitter-side Optimod, make
one OPTIMOD-PC User preset for each transmitter-side Optimod preset.
C) Adjust the transmitter-side Optimod's input reference level so that the Opti-
mod performs the correct amount of multiband gain reduction (i.e., the same
amount of GR that it would have performed if its internal AGC were active).
OPTIMOD-PC implements full dual-mono architecture in both the AGC and the five-
band compressor sections. You can couple each band in both the AGC and five-band
compressors to a variable extent—anywhere from perfect stereo coupling to com-
pletely uncoupled operation. The coupling control determines the maximum
amount of gain imbalance permitted between the left and right channels in a given
band, and therefore the amount of stereo image shift permitted in each frequency
band.
Although the processing is dual-mono, you cannot adjust setup controls independ-
ently on the left and right channels. We assumed that OPTIMOD-PC would always
process stereo program material or dual program sources requiring the same
amount of processing (like dual-language programming in video applications).
To operate in dual mode, you must create a five-band user preset with the following
settings:
AGC Matrix.......................................................................................... L/R
AGC MaxDelta GR.............................................................................. Off
Stereo Enhancer.................................................................................Out
Band 1-5 MaxDeltGR ......................................................................... Off
The signal flows through OPTIMOD-PC through the following blocks:
•
Stereo Enhancement, with two user selectable algorithms
•
Input Conditioning, including defeatable highpass filtering and defeatable
phase rotation
•
Two-Band Gated AGC, with target-zone window gating and silence gating
•
Equalization, including high-frequency enhancement
ORBAN MODEL 1101
Advertisement
Table of Contents
