Mixer : Dithering Options
10 - 280
None
No dither signal will be added to the data.
Rectangular
A rectangle shape dither signal will be added to the data. Rectangular distribution is a family of symmetric proba-
bility distributions such that for each member of the family, all intervals of the same length on the distribution's
support are equally probable.
Triangular
A triangle shape dither signal will be added to the data. Triangular distribution is a continuous probability distri-
bution with lower limit a, upper limit b and mode c, where a < b and a = c = b.
Noise Shaping
Noise shaping is a technique that is used to push quantization noise energy, which in linear digital systems is nor-
mally spread over the whole audio spectrum (0 Hz up to half the sampling frequency), into higher frequencies
where the human ear is less sensitive to its effects. There are three noise shaping options and the graph shows the
curve applied:
Off
No noise shaping added.
Hi Pass
This provides a first-order high-pass filter for the noise transfer function. This type of noise shaping takes little
computational power to produce, but at the expense of not Tracking the characteristics of the human ear very
accurately when compared with:
Equal Loudness
Psycho acoustically noise shaped dither inserts an FIR-filter in the feedback path. This shapes the noise as closely
as possible to the characteristics of the human ear. More taps in this type of filter allow a closer approximation to
the response curve of the ear, but each tap, of course, increases the computational instructions required. The filter
implemented here is a 9-tap FIR-filter, which closely approximates the curve of the human ear.
Note: As usual there is no “free lunch”. So Acoustic noise-shaping uses more resources than Hi
Pass.
POW-r
Note: POW-r is a set of licensed noise shaping which requires the Pow- R Redithering Key
POW-r offers the choice of three settings, POW-r 1, POW-r 2 and POW-r 3. The graph indicates the effect of the
noise-shaping.
Dithering POW-r floating Window
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