APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Bedienungsanleitung PDF herunterladen (Seite 32)

32 Parameters

which is determined by the Order menu, a slope of -12dB/Oct corresponding to a second order

ﬁlter and a slope of -24dB/Oct to a fourth order ﬁlter.

Resonant High-Pass Filter

Amplitude (dB)

Frequency (Hz)

0dB

−3dB

Cutoff

Frequency

Slope (dB/Oct)

Q=2

Q=1

Q=4

Q=10

Figure 15: Frequency response of the high-pass ﬁlter.

The high-pass resonant ﬁlter works in exactly the opposite manner as the low-pass resonant

ﬁlter by removing the frequency component of a signal located below the cutoff frequency while

leaving those above the cutoff frequency unchanged. Similarly to the low-pass ﬁlter, the Q-factor

controls the emphasis of frequencies located around the cut-off frequency.

Band-Pass Filter

The behavior of a band-pass ﬁlter is to let the frequencies in a band located around a center fre-

quency and to attenuate the frequencies outside of this band as shown in Figure 16. The bandwidth

of the band-pass ﬁlter is set with the Q knob while the center frequency is set with the Cutoff knob.

The Order control sets the order of the ﬁlter. This parameter affects the slope of the roll-off on

both sides of the center frequency. For a second order ﬁlter the slope is -6dB/Oct while for a fourth

order ﬁlter it is -12dB/Oct.

Notch Filter

The notch ﬁlter does essentially the opposite of the band-pass ﬁlter. It attenuates the frequencies

in a band located around the center frequency and leaves those outside of this band unchanged as

shown in Figure 30. The Cutoff knob is used adjust the center frequency and the Q knob sets the

bandwidth of the notch. Note that the center frequency is totally removed from the spectrum of the

output signal of the ﬁlter.

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APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Bedienungsanleitung Seite 32