Powerstick
6 Programming the DSP
20
6.4.9
Low-pass filter
Definition:
lpf [characteristic] [< frequency>Hz|kHz]
Description:
Defines a low-pass filter with a certain characteristic at a specified frequency
(-3 dB point). The characteristic can be programmed as slew rate in Q factor or
as follows:
• Butterworth characteristic, 6 up to 48 dB per octave in 6 dB steps
• BW6, BW12, BW18, BW 24, BW 30, BW 36, BW 42, BW 48
• Bessel characteristic, 6 up to 48 dB per octave in 6 dB steps
• BS6, BS12, BS18, BS24, BS30, BS36, BS42, BS48
• Linkwitz-Riley characteristic, 12 up to 48 dB per octave in 12 dB steps
• LR12, LR24, LR48
Example(s):
lpf BW24 1.2Hz
lpf Q0.5 800Hz
# Butterworth 24 dB pro octave at the
frequency 1.2 kHz
# low-pass filter programmed with Q
6.4.10
High-Shelf
Definition:
hshelf [6/12] [< frequency>Hz|kHz] [<gain>dB]
Description:
Defines a high frequency shelving filter. The frequency defines the middle of
the filter.
Example(s):
hshelf 6 10kHz +3dB
# High-Shelf filter with a slope of 6 dB
per octave at 10 kHz by +3 dB
