Digital Audio Corporation PCAP II, User Manual

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4.4.2 1CH Adaptive Filter
Application:
The 1CH Adaptive filter is used to automatically cancel
predictable and convolutional noises from the input audio.
Predictable noises include tones, hum, buzz, engine/motor
noise, and, to some degree, music. Convolutional noises
include echoes, reverberations, and room acoustics.
Description of controls (Figure 4-12) is as follows:
Conditional
For advanced users only. Novice users
Adaptation: should keep Filter will adapt set to
Always . The Threshold setting is
meaningless in this case.
Conditional Adaptation allows the adaptive
filter to automatically Adapt/Freeze based
upon bargraph levels as displayed on the
Master Control Panel. This can be very
useful in situations where there are pauses,
or breaks, in the speech being processed.
For example, if you only desire the filter to
adapt when no one is talking, you will first
need to observe the
Input bargraph levels to
determine the dB level below which no
talking occurs. Then, click on
If
Input<Threshold and set the Threshold to
Figure 4-12 1CH Adaptive Filter Control Window