Digital Audio Corporation PCAP II, Руководство пользователя

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additional SIFs. (The PCAP II will series up to four). The audio
outside those limits is unfiltered.
Range and Gain: SIF is a spectral attenuator. The spectral peaks
are pressed down toward the spectral valleys. The amount of
reduction is limited by the
Range scroll bar. If, however, all peaks
are reduced to the lowest valley, no more reduction takes place.
For example, if the distance from the highest peak to the lowest
valley
between the Upper and Lower Limits is 30dB, the maximum
range actually used will be 30dB, even if the scroll bar is set to a
larger
Range . Normally a Range of 10-20dB is adequate, as
attacking the stronger spectral peaks will provide the necessary
enhancement. Go gently at first and compare several SIFs with
different
Ranges . The Store and Recall memories are useful in
saving candidate filter solutions.
Since the SIF is an attenuator, the audio level should be restored with
the
Gain scroll bar. Normally, setting this to one-half the Range is
adequate. If output distortion occurs, reduce the Gain . The Gain
may be increased to make up for losses in previous Filter stages.
Note that the Gain is usually 0 dB in the
Attack Noise mode.
Figure 4-39 Attack Noise operation, Attack Range set to 30dB