The DSP Toolchest
409
• Category: EQ, Mastering
• Channels: 1, 2
Description:
MIOEq 6 Band implements a mono or stereo 6-band IIR EQ processor. Each band is fully para-
metric, and can be set to any of the filter types. All the parameters of all the bands can be set to
any of valid settings (as detailed below). The composite EQ curve is applied to the input signal,
and the master gain is then applied to the processed signal.
Note: Each band of EQ is capable of being configured as one of 6 types of EQ Filter. The types are:
Peaking/Parametric, Low Shelf, Hi Shelf, Hi Cut, Low Cut, Band Pass, and RIAA. The first 5 types
are parametric filters that allow you to use the Frequency, Gain and Bandwidth controls to adjust
position and shape of the filter that is applied. The RIAA type is special. It is used to decode a signal
that has been RIAA encoded (for example, the signal on a phonograph disc). This filter type would
be selected if you need to decode the output of a phonograph player that is directly connected
to the inputs of your interface, without the use of an external RIAA phono preamp. Only one band
of EQ should be set to RIAA on a channel as using the filter twice will not provide useful results.
Master Parameters:
Enable
{Off, On}
Enables the EQ block. When disabled, the EQ (including the master gain) is hard-bypassed,
and does not consume DSP power.
Gain
[-80, 10] dB
Master gain applied to the signal at the output of the EQ block. Since the EQ is implemented
as a high-resolution floating point process, you can bring the output signal of the EQ out of
any degree of clipping using this parameter.
Master Bypass
{On, Off}
Disables the EQ block. When disabled, the EQ (including the master gain) is hard-bypassed,
and does not consume DSP power.
Per-filter Parameters:
Enable
{Off, On}
Enables the band. When disabled, the band is hard-bypassed.
Gain
[-24, 24] dB
Sets the parametric gain on the EQ band. For peaking filters, this is the gain at the peak of
the band. For shelving filters, this is the gain at the extreme limit of the filter. This parameter
is ignored for the high and low pass filter types as well as the bandpass filter type.
Frequency
[20, 22k] Hz
Sets the characteristic frequency of the filter band.
Bandwidth
[0.01, 2.5] Oct
Sets the bandwidth of the filter band in octaves.
