User`s manual

The Analyzer Gain should be increased to display weaker energy components. Do not overload

(OVL) the analyzer, as the spectral information would become corrupted.

Try to capture a representative spectrum using the Run button. Once a stable, representative spectrum

is obtained on the display, freeze the analyzer (GREEN Run LED unlit). This same spectrum may be

used for several different variations of the filter (changing Limits or Filter Amount, as an example).

NOTE: Immediately following a freeze, the screen will continue to update briefly, as the PC is

receiving the final prefrozen spectral data from the external unit.

Limits: In the Equalize Voice operation, the Upper and Lower Voice Limits should bracket the

voice signal. Outside these limits, the audio is bandpass-filtered. Setting the LowerVoice Limit above

300 Hz and the Upper Limit below 3000 Hz may adversely affect intelligibility. Try several sets of

Limits; build the SIFs; Store the filters, and Recall and compare in an A/B fashion.

In the Attack Noise operation, bracket the noise band surgically with these Limits. If there are several

disjoint noise bands, series additional SIFs. (The PCAP II Plus will series up to four). The audio

outside those limits is unfiltered.

Filter Amount and Output Gain: SIF is a spectral attenuator. The spectral peaks are pressed down

toward the spectral valleys. The amount of reduction is limited by the Fitler Amount 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. Normally a Range of 60-90% is

adequate, as attacking the stronger spectral peaks will provide the necessary enhancement. Go gently

at first and compare several SIFs with different Filter Amounts. 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 Output Gain scroll bar.

Normally, setting this to 3-10 dB. If output distortion occurs, reduce the Output Gain. The Output

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.

Output Shape: Four output spectral shapes are selectable by the user. The Flat shape requires the SIF

to produce a uniform (to the degree possible) long-term output spectrum. This can be subsequently

reshaped by the Hi-Res Graphic Filter or Output Equalizer to a more natural-sounding spectrum.

Alternately, the Voice or Pink shapes may be selected which have built-in output shaping. The Pink

shape is often the most pleasing. The Custom shape is used when the other three predefined shapes

are not adequate.