miniDSP Ltd, Hong Kong /
/ Features and specifications subject to change without prior notice
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8.8
PEQ
ADVANCED MODE
The parametric EQ can use
Advanced
mode, which allows you to directly provide the low-level parameters aka
biquad coefficients
that control the digital filters of the processor. This allows you to load other types of
parametric filters or to import a complete correction file generated by other software.
8.8.1
What’s a “biquad?
A biquad is the basic unit of processing that is used to create digital filters. It can be described either with an
equation or with a signal flow diagram, as shown here:
A single biquad like this can perform a great many functions, including all of the functions of a single parametric
EQ filter, one 6 or 12 dB/octave high pass or low pass filter, and more. Biquads are combined in series
(cascaded) to create more complex filters. The function that each biquad performs is determined by just five
numbers:
a1
,
a2
,
b0
,
b1
, and
b2
. These numbers are called the
coefficients
.
8.8.2
Advanced mode for a single filter
To change a single filter, switch it to Advanced mode:
The display will change as shown below. Paste in the coefficients in the format shown, then click on the
Process
button for them to take effect:
