User`s manual

Figure 7-6: Bandpass Filter Control Window

Description of controls is as follows:

Lower Specifies frequency in Hertz below which all

Cutoff signals are attenuated. Frequencies between this

Frequency: cutoff and the Upper Cutoff Frequency are Unaffected. Minimum Lower Cutoff

Frequency is 0 Hz, while the maximum Lower Cutoff Frequency is 100 Hz below the

Upper Cutoff Frequency. Lower Cutoff Frequency can be adjusted in 1 Hz steps.

NOTE: The Lower Cutoff Frequency can never be set higher than 100 Hz below the

Upper Cutoff Frequency.

Upper Specifies frequency in Hertz above which all

Cutoff signals are attenuated. Frequencies between this

Frequency: cutoff and the Lower Cutoff Frequency are unaffected. Minimum Upper Cutoff

Frequency is 100 Hz above the Lower Cutoff Frequency, while the maximum Upper

Cutoff Frequency is 5400 Hz. Upper Cutoff Frequency can be adjusted in 1 Hz

steps.

NOTE: The Upper Cutoff Frequency can never be set lower than 100 Hz above the

Lower Cutoff Frequency.

Transition Specifies slope at which frequencies below the

Slope: Lower Cutoff Frequency and above the Upper Cutoff Frequency are attenuated in

dB per octave. Sharpest attenuation occurs when Transition Slope is set to

maximum, while gentlest attenuation occurs when Transition Slope is set to

minimum. Note that the indicated value changes depending upon Cutoff Frequency.

Also, note that the Lower and Upper Transition Slopes always have different values;

this is because the frequency width of an octave is proportional to Cutoff Frequency.

Stopband Specifies amount in dB by which frequencies below

Attenuation: the Lower Cutoff Frequency and above the Upper Cutoff Frequency are ultimately

attenuated. Stopband Attenuation is adjustable from 0dB to 90dB in 1 dB steps.

A graphical description of the Bandpass filter and its controls follows in the figure below.

Figure 7-7: Bandpass Filter Graphical Description