XTA 4 Series, Operator'S Manual, Page: 46 / 58

Page 46 4 Series 4 Series 4 Series 4 Series Operator’s Manual
Bandpass Filter
InA Input A BPS:1/ InA Input A BPS:1/ InA Input A BPS:1/ InA Input A BPS:1/\ \ \ \
1k00Hz Q=3.0 Bandpass 1k00Hz Q=3.0 Bandpass 1k00Hz Q=3.0 Bandpass 1k00Hz Q=3.0 Bandpass
Remember – to change filter types, press BYPASS
BYPASS BYPASS
BYPASS to bypass
the filter, and then use
ENTER ENTER ENTER ENTER
to select the filter type.
The bandpass 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, 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
InA Input A NOT:1
InA Input A NOT:1 InA Input A NOT:1
InA Input A NOT:1\
\ \
\/
/ /
/
1k00Hz Q=0.75 Notch
1k00Hz Q=0.75 Notch 1k00Hz Q=0.75 Notch
1k00Hz Q=0.75 Notch
Remember – to change filter types, press
BYPASS BYPASS BYPASS BYPASS
to bypass
the filter, and then use
ENTER ENTER ENTER ENTER
to select the filter type.
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.