Re: [Audacity-nyquist] newest rectifier plugs

[<edg...@we...>]

Hi David,

David wrote: Are the oscillations sine waves, what frequency, or does
that depend on the input signal?

Edgar: The the oscillations are always sine waves and the frequency of the
oscillations is always equal to the cutoff frequency of the filter where
high pass or low pass doesn't matter.

The higher the degree of the filter the worse the oscillations.
For example highpass8 causes more oscillations than highpass2.

In electronics an oscillator is nothing but a filter with a feedback of
1.0 or more so the filter never stops to oscillate. In principle both
are the same.

Unfortunately in this case the oscillations are at a frequency of 20 Hz or
below so I think they are impossible or at least extremely difficult to
hear with headphones or loudspeakers.

I just have tested your code modifications and it seems that you are right
and this works best until now. It seems means I cannot say it surely because
as usual the amount of oscillations at the beginning are dependent to the
waveform of the sound or better to the offset caused by the rectification.
The worse the offset, the worse the oscillations.

To give you an imagination: the oscillations are about double a s high as
the maximum peak of the sound after the oscillations.

I will read more about that snd-fetch function later on, I also have some
manuals about the xlisp object system, maybe this helps but I cannot
promise.

Unfortunately this is very difficult to fix without visual feedback.

On the other hand: a rectifier is an effect that you usually use on a
complete sound. What is a complete sound ? I mean you do not use it on
a single word in the middle of a sentence in a speech recording. You
usually first generate a synthesizer sound and apply the effect on it
so in case of doubt you can fade away the oscillations afterwards.

I know this is no perfect solution but what is perfect in life ?

- edgar





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