Parametric Equaliser Screen - PROEL DSO26 User Manual

DSO26 User Manual

Parametric Equaliser Screen

To adjust parametric settings:
Use the 'FREQ' control for the frequency.
Use the 'Q' control for the Q.
Use the 'GAIN' control for the gain.
Each parametric section can be positioned at a frequency from 20Hz to 20kHz and
features a wide range of 'Q's to produce response curves ranging from broad to notch. The
gain control ranges from +15dB to -30dB in 0.1dB steps. Frequency steps are 1/36 octave
resolution for precise control. Since all filtering is achieved in DSP all settings are re-
settable with absolute accuracy and in ganged mode parameters track identically. Very
narrow band notch filters (maximum 'Q' of 128) can be achieved and unlike analogue
filters these tight 'Q' filters are entirely stable. The maximum notch depth is -30dB.
Parametric filters are carefully implemented using Double Precision processing. This
method is costly in terms of processing power but yields substantial benefits in terms of
the DSO26's exceptional noise performance and greatly improved low frequency stability.
(Note: To show parametric filters in bandwidth (BW) rather than 'Q', go into the 'System
sub-menu', select 'filter Q or BW', select BW.)
To switch a filter from parametric mode to shelving mode, set the gain of the filter to 0dB
and then turn the 'Q' control anti-clockwise until 'HiSHF' or 'LoSHF' is displayed. Now set
the frequency and gain as required. To set the filter back to a parametric section, just
ensure that the gain is at 0dB, otherwise the 'Q' control will have no effect.
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