User`s manual
mcdsp.com
Page 27
McDSP NF575
Band Stop Filter
Band stop lters, or notch lters, are designed to
remove a specied amount of signal at exactly the
selected frequency. Band stop (notch) lters have a
slope, or Q control, that determines the width of the
actual notch shape. A Q of 1.0 is about one frequency
octave. A Q of 12.0 is about 1/12 a frequency octave, or
one semi-tone. At the exact selected frequency of the
band stop (notch) lter the signal reduction is maximum.
Some band stop (notch) lters, like those found on the
NF575, allow user adjustment of the amount of signal
reduction.
A band stop (notch) is useful for removing cyclical noise
like 60 Hz hum and camera shutter noise.
Band Pass Filter
Band pass lters only pass signal at the exact selected
frequency. Signal levels are reduced for frequencies
above and below the selected frequency. Band pass
lters have a slope, or Q control, that determines the
width of the actual band pass shape. A Q of 1.0 is
about one frequency octave. A Q of 12.0 is about 1/12
a frequency octave, or one semi-tone.
A band pass lter is useful for auditioning narrow
segments of the audio spectrum to monitor cyclical
noise and other audio signal problems.
FREQUENCY
dB
FREQUENCY
dB