ALGORITHMS
M5DYN
Rev 1.1 Page 8
PARAM.EQ M5000
This algorithm is the Digital Equalizer part of the MD2 extension TOOLBOX.
This digital EQ features a four-band parametric EQ with high- and low-pass filters switchable
to notch, shelving and cut filters. The needle sharp notch filter has a range down to 0.02
octave, the shelving filters has a variable slope ranging from gentle 3 dB/oct over 6 and 9 to
12dB/oct. Cut filters are switchable between 12dB/oct maximum flat amplitude (Butterworth)
or flat group delay (Bessel) types. The parametric equalizer features a natural and well defined
bandwidth behavior at all gain and width settings:
Fig.1 The bandwidth of the parametric EQ is expressed Fig.2 The bandwidth of the notch filter is defined at its
in octaves and is defined at half the EQ gain -3dB points.
The shelving and parametric filters have a 100% symmetrical boost/cut response, i.e. a
positive setting in one band can be canceled exactly by another with the same negative gain
setting (using the same frequency and bandwidth settings - like fig. 1) .
All equalizer settings can be changed ‘on the fly’ with no unnatural audible artifacts. A fast
acting morphing technique naturally transforms any EQ setting into another (including EQ
type and on/off selections). The morph time is fixed.
All filters are minimum phase types - i.e. there is a unique relationship between the amplitude
and the phase response of the filters. The filters are done in extended resolution
implementations with active noise shaping that forces errors at the 48th bit level further
towards zero.
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