XTA DC1048 - Manual (Page 52)

Page 52 DC1048 Integrated Audio Management Operator’s Manual
Bandpass Filter
The bandpass filter has adjustable
frequency and‘Q’ (or Bandwidth)
controls. These affect a range of
frequencies symmetrically about
the centre frequency as shown in
the graph, gradually cutting the
level, but providing no gain.
Remember that ‘Q’ is
1/Bandwidth, so the higher the
‘Q’, the lower the Bandwidth, and
the smaller the range of
frequencies affected.
Note that the response is fundamentally NOT a flat-topped response (so it is not
constructed from a high pass and low pass). See previous page for details of how
to construct a flat-topped filter response.
Notch Filter
The notch filter has adjustable
frequency and ‘Q’ (or Bandwidth)
controls. These affect a range of
frequencies symmetrically about
the centre freqency as shown in
the graph.
Remember that ‘Q’ is
1/Bandwidth, so the higher the
‘Q’, the lower the Bandwidth, and
the smaller the range of
frequencies affected. The notch
filter depth varies with bandwidth
– the wider the filter, the lower
the depth will be.