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OPTIMOD-PC
nels can be operated anywhere from fully coupled to independent. We recommend
operating band 1-4 fully coupled (B
stability. However, audio-processing experts may want to experiment with lesser
amounts of coupling to achieve a wider, "fatter" stereo image at the cost of some
image instability.
B5 M
D
GR is set O
AX
ELT
fast-operating high frequency limiter that works independently on the left and right
channels. This prevents gain reduction in one channel from causing audible spectral
modulation on the other channel. However, the additional stereo difference chan-
nel energy created by independent operation can adversely affect certain low bi-
trate codecs (like WMA). It is wise to do careful listening tests through the codec to
determine if it sounds better with B5 M
B1/B2 Crossover (Band 1 to Band 2 Crossover Frequency) sets the crossover fre-
quency between bands 1 and 2 to either 100 Hz or 200 Hz. It significantly affects the
bass texture, and the best way to understand the differences between the two
crossover frequencies is to listen.
If the Host Computer Restarts or Crashes...
When you are using OPTIMOD-PC's hardware inputs and outputs (that is, when
OPTIMOD-PC is emulating a stand-alone audio processor), OPTIMOD-PC is designed
to gracefully handle problems that occur in the host computer:
•
If the host computer is restarted in an orderly way (using Windows' "restart"
command), OPTIMOD-PC will continue to process audio normally through its
hardware inputs and outputs with no gaps or interruptions. This allows you to
do normal Windows security updates without interrupting the audio even if the
updates require you to restart your computer.
•
If the host computer crashes, OPTIMOD-PC will usually continue to pass signal
normally through its hardware inputs and outputs because its processing is done
with onboard DSP, independent of the computer's CPU or operating system.
When you finally reset the host computer to recover from the crash (via either a
hardware reset or Ctrl-Alt-Del), OPTIMOD-PC will also reset and will temporarily
load unity-gain bypass DSP code. This will cause a mute lasting a fraction of a
second. OPTIMOD-PC will then continue to pass signal through this bypass code
until its driver has loaded, at which point the driver will load normal audio proc-
essing DSP code into OPTIMOD-PC. After another fraction-of-a-second mute to
accommodate the load, OPTIMOD-PC will now operate normally, using the same
preset that was active before the crash.
See About the OPTIMOD-PC Driver and Service on page 4-3.
1-4 M
AND
most factory presets. This permits band 5 to be used as a
FF
D
AX
ELT
GR = 0) for best stereo image
D
AX
ELT
GR = 0 dB.
3-53
OPERATION
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