Hey hey,
I'm trying to reconstruct an effect that was built for Ableton Live. The process is described step ty step. At one point though I'm not sure, whether I miss out on a point that's obvious in the video images / signal flow graph on screen or whether it is a slightly different behaviour of Csound phaser2.
Here's the video:
At 3:18 he starts adding the phaser and talking about the phaser related stuff, explaining the baiscs of a phaser.
And at 3:55 he is duplicating the phaser to perform phase inversion to parts of the signal. I don't get which part. I have tried with different combinations of phase inverted dry signal and phaser2 output, but either both white noise input and sawtooth sound unaffected or both sound affected.
Can any one point out my error or lack of information?
adding the signals creates a notch. If you subtract them, you get a peak. The opcode allows you
to have as many notches or peaks (by increasing the order) as you’d like.
Hi Victor,
the author is not creating a phaser exactly. He somehow creates a phase
inverted copy of either a dry or phased signal and adds those. With
white noise the effect was that you could not hear anything. Patching a
sawtooth into that you could hear an effect when the phaser was used.
The components he used appear to be straightforward, like basic Csound
opcodes in a way. Certainly up to that point in his processing chain.
Best wishes,
Jeanette
Jun 24 2024, vlz has written:
...
https://youtu.be/_SyB2WqKwP4
At 3:18 he starts adding the phaser and talking about the phaser related stuff, explaining the baiscs of a phaser.
And at 3:55 he is duplicating the phaser to perform phase inversion to parts of the signal. I don't get which part. I have tried with different combinations of phase inverted dry signal and phaser2 output, but either both white noise input and sawtooth sound unaffected or both sound affected.
A notch phaser (adding allpass and its input) with a higher Q may not have much of
an effect on white noise, because the notch is too narrow. It can still have some effect on
a sawtooth because it might remove one or more harmonics (depending on how many
notches there are). So that may be the case of what you are hearing.
Hi Jeanette,
I suppose you could try the following simple modifications in the output calculation by Victor:
out (a2+a1)/2
to either
a) -a2+a1 or
b) a2-a1
The final result should be the same as you described. (Does this make sense - easy to try)
–Risto
ma 24. kesäk. 2024 klo 16.39 Jeanette C. (julien@mail.upb.de) kirjoitti:
Hi Victor,
the author is not creating a phaser exactly. He somehow creates a phase
inverted copy of either a dry or phased signal and adds those. With
white noise the effect was that you could not hear anything. Patching a
sawtooth into that you could hear an effect when the phaser was used.
The components he used appear to be straightforward, like basic Csound
opcodes in a way. Certainly up to that point in his processing chain.
Best wishes,
Jeanette
Jun 24 2024, vlz has written:
…
https://youtu.be/_SyB2WqKwP4
At 3:18 he starts adding the phaser and talking about the phaser related stuff, explaining the baiscs of a phaser.
And at 3:55 he is duplicating the phaser to perform phase inversion to parts of the signal. I don’t get which part. I have tried with different combinations of phase inverted dry signal and phaser2 output, but either both white noise input and sawtooth sound unaffected or both sound affected.
…
Hi Victor and Risto,
sorry, that was a slightly garbled reply. In the end both your replies together and someone having taken a look at the video made sense. I profess I don't really get the whole idea, but I can now replicate the signal flow. To lay it out:
aIn = some audio
aPhaser = phaser2(aIn, and the rest)
aPhaser2 = aIn - aPhaser
aOut = aPhaser - aPhasor2
In the end this should translate as:
aOut = aPhasor * 2 - aIn
Strange, but there you are. I'm working on it and will try different versions in the further development to see what - if any - difference it makes.
