Digital Audio Corporation PCAP II, User Manual

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Run/Freeze button which allows the user to
start ( Run indication) or stop ( Freeze indication)
update of the averaged spectrum.
•
Num Averages setting which allows the user to
specify the degree of smoothing of the original
audio power spectrum. For minimum smoothing,
set to
1 ; for maximum smoothing, set to 128 . A
long-term power spectrum (64 to 128 averages)
is best for setting up the filter.
•
Gain control which allows the user to apply a
digital gain of up to 40dB to the analyzer input,
allowing low-level spectrum components to be
displayed; however, if excessive gain is applied,
the analyzer input will overload, causing the
Gain label to change to OVL (analyzer overload)
and the captions at the bottom of the Filter
Display area to change color to red.
Filter
Specifies whether SIF is to be used to Equalize
Operation Voice or Attack Noise . When Equalize Voice
Block: is selected, the SIF control window appears as
shown in Figure 4-32. When
Attack Noise is
selected, the SIF Control Window appears as shown
in Figure 4-33.
Equalize Voice operation is used to reshape the
original input voice audio to a more natural-sounding
spectral shape over a specified frequency range. All
audio outside this frequency range is attenuated by
40dB.
Attack Noise operation is used to attack large-
magnitude narrow-band noises (such as motor
noises) over a specified frequency range. Audio
outside this frequency range remains unaffected (0dB
attenuation).
Range/
For Equalize Voice operation, specifies EQ Range
Gain Block: and Gain . For Attack Noise operation, specifies
Attack Range and Gain .
EQ or Attack Range specifies the maximum amount
of volume reduction that can be applied by the