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User’s Guide
6200 Digital
Voice Processor
To download the latest version of 6200 Designer, a Windows GUI
application interface for the 6200, go to: www.airtoolsaudio.com
HIGH PASS FILTER:
High pass filters allow selectively modifying a signal by attenuating all signals below a specified cut-off frequency. They can be
useful to remove noise or other unwanted frequencies. A high pass filter in a voice processor is typically used to reduce rumble
picked up by the microphone. It can reduce boominess in a voice, noise from handling the mic, fingers tapping on a desk, etc.
The 6200 offers 6 dB/octave, 12 dB/octave, 18 dB/octave and 24 dB/octave filters. Additionally, “peak” versions of each filter are
provided for further flexibility and tuning. The filters with the steeper response filter more sharply.
Controls:
Bypass/Enabled - When bypassed, the input is sent unmodified to the output. When enabled, the module processes the signal.
High Pass Frequency - Determines the cut-off frequency of the filter. All frequencies below this will be progressively attenuated.
Technically, this frequency is the “3 dB down point”, i.e. the point where the filter response is 3 dB lower than it is for unaffected
signals.
HP Filter
Slope - Determines the type of filter (slope) to use in order to select how steep or aggressive the filter is.
Technical note: This module implements Butterworth filters which are generally preferred for audio because of their flat
frequency response in the pass band.
DE-ESSER:
A de-esser is a frequency-selective compressor. It is used to remove sibilance by detecting the presence of excessive “S”
frequencies and then reducing those frequencies in amplitude.
Controls:
Bypass/Enabled - When bypassed, the input is sent unmodified to the output. When enabled, the module processes the signal.
De-esser (Response) - Determines the aggressiveness of the de-essing (Gentle, Normal or Aggressive). The de-esser is a dual
band design. It compares the relative energy above the 2.5 kHz rollover point to the energy below and limits the upper band
when the high frequency energy is greater than a threshold amount. The Gentle, Normal, and Aggressive settings determine
how much relative high frequency energy is required to start the high frequency gain reduction.
Gain Reduction (Meter) - A gain reduction meter is provided so that the effect of the de-esser can be observed.
PARAMETRIC (1 through 4) EQ:
With parametric equalizers you can adjust center-frequency, gain, and bandwidth of a filter band. Parametric EQ can be used
to tailor an overall sound quality or to more accurately boost/cut specific frequency ranges. The 6200 provides a four-band
parametric EQ. Each of the four bands can be individually adjusted.
Controls:
Bypass/Enabled - You can selectively enable or disable a given parametric band. If a band is disabled, it has no effect on the
signal, regardless of the other settings for this band.
Parametric (n) Freq - The center frequency of the equalizer band.
Parametric (n) BW - The bandwidth of the peak or dip applied to the signal, expressed as the Q factor. Q is a dimensionless
(unitless) quantity used to describe bandwidth.
Parametric (n) Gain - The amount of gain or attenuation (boost or cut) applied at the center frequency.
Note: Only one set of controls is outlined. Bands 1 through 4 are identical.
SHELVING FILTER:
High Shelf and Low Shelf filters are simple filters that can be used to modify the treble or bass content of a signal. They are
designed to emulate traditional analog tone or treble/bass controls. If you need to give a non-technical end user control over
treble and bass, a shelf filter is the way to go. The low shelf filter can be used to boost or cut the bass from a signal. The high
shelf filter can be used to boost or cut the treble from a signal. The 6200 provides one shelving filter which can be set as a low
or high shelf. For a basic treble control, use a high shelf filter and set the frequency between 2 kHz and 5 kHz. For a basic bass
control, use a low shelf filter and set the frequency between 200 and 500 Hz.
Controls:
Bypass/Enabled - When bypassed, the input is sent unmodified to the output. When enabled, the module processes the signal.
Shelving Frequency - Determines where the boost or cut takes place. For low shelf filters, all frequencies below this will be
affected. For high shelf filters, all frequencies above this will be affected. Technically, the indicated frequency is the point where
the filter has reached half of its specified dB gain. For example, for +6 dB boost with a 1 kHz frequency, the signal is boosted by
+3 dB at 1 kHz.
Shelving Gain - Determines the amount of boost or cut applied.
Shelving Type - Defines the type of shelving filter in use (Low Shelf or High Shelf) and the aggressiveness of the shelf ramp
(Gentle, Normal or Aggressive).
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