Bit reduction, Approximation filter, Resampler – D16 Group Drumazon 2 Drum Machine 909 Emulation Plug-In User Manual
Page 21: Images filter, Mixer, Dynamics
Bit reduction
•
Dither
- Sets the intensity of the half-bit white noise that is added to the signal just before quantization.
This reduces harmonic distortion that results from the signal’s amplitude degradation by masking the side effects
of quantization.
•
Bits
- The number of bits the input signal’s amplitude is degraded to, which corresponds to 2^N actual quantiza-
tion levels.
Approximation filter
This is an optional filter to remove partial or complete harmonic content above the resampler’s Nyquist frequency,
controlling the level of aliasing that occurs below the resampling frequency. It removes harmonic content before the
discretization process.
•
Enable
- Activates / deactivates the filter.
•
Freq
- Sets the cutoff frequency of the
Approximation Filter
relative to the Nyquist frequency of the resampler,
controlled by these parameters;
•
0
(the default) - Sets the
Approximation Filter’s
cutoff frequency exactly at the Nyquist frequency
(no offset). This removes all harmonic content above the Nyquist frequency, preventing audible artefacts.
The only occurring artefacts are images (harmonics occurring above the Nyquist).
•
< 0
(negative offset) - Sets the
Approximation Filter’s
cutoff frequency below the Nyquist frequency.
This removes audible aliasing and part of the original harmonic content below the Nyquist frequency
(proportionally, according to the negative
Freq
offset), as well as some images near the Nyquist.
•
> 0
(positive offset) - Sets the cutoff frequency above the Nyquist frequency. As a result, aliasing will start
to appear (artefacts below Nyquist frequency) in proportion to the positive
Freq
value.
Resampler
•
Freq
- Sets the frequency the signal is discretized to (resampled). This parameter ranges from 44 Hz to 44.1 kHz
•
Jitter
- Controls the intensity of random, short-period clock deviations in the resampler.
Images filter
Images are artefacts that result from resampling a higher sample rate to a lower sample rate. The
Images Filter
removes
some or all of these artefacts from the audio spectrum after the discretization process.
•
Enable
- Enables the images filter.
•
Freq
- Sets the cutoff frequency of the
Images Filter
relative to the Nyquist frequency of the resampler.
The higher the value of this parameter, the higher the frequency of harmonics passed to the output
(above the resampler’s Nyquist frequency).
Mixer
•
FX
– The crossfade between
Dry
and
Wet
signals
Dynamics
This is two effects in one; a typical compressor with a side chain option and an amplitude shaper with an envelope
triggered via
Drumazon’s
instruments.
There are two instances of the effect in the
FX Bus
chains.
21
inteRface oveRview •
The sound conTrol secTion