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Useful HP without Dezip (and crackle)

DSP related issues, mathematics, processing and techniques

Useful HP without Dezip (and crackle)

Postby » Mon Oct 15, 2018 3:38 pm


This post and version is redundant!
New Version can be found here:


Hi, de-zip is very useful but it has a profound impact upon the quality of the audio which is affected.
I have a keen ear and I produce music everyday so I notice it.

I came up with a great way of mixing two signals without there being any affect by the dezipper.
I did it by using the inertia plugin by acrobat.

I split the signal so that there is two sources of signal.

Next I placed the high pass near to the signal it was affecting (I used the optimized stereo pack - will credit once I find the name associated).
I made sure I added first a multiplexer and then a selector around the high pass so that the circuit
could be turned off altogether and it can gracefully revert to the dry signal.
(I often like to ensure that the Boolean or int first affects the selector last and then the multiplexer first so that the transition is seamless.)

So, it would be ideal to have a 0-1 fader (that gradually increases the value) and yet You need code to mix
the wet and dry signal without too much colour. To do so I used DSP Code:

Code: Select all
streamin highpass;
streamin dry;
streamin mixer;
streamout wet;
wet = (highpass*mixer)+(dry*(1-mixer));

Making sure that this code is nestled within multiplexer and selector I then proceeded to work on the
module containing Martin Vivancek's High Pass code:
within hp module.jpg

So, that sets up the stage to control the crossfade between signal a and b.
A being the dry signal and B being the signal processed by the High Pass.

So, here within the main slider module (horizontal slider) I added the following code:
within knob module.jpg

As you can see, if this had been a lowpass You would a different signal to the Boolean but because it is
a high pass a simple Boolean will turn on if it is anything but a 0.

tq resized-2.jpg

I hope that is illustrative enough; I edited this post so that it was a bit simpler. I had not originally had
any images to attach.
Last edited by on Fri Nov 02, 2018 3:08 pm, edited 2 times in total.
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Re: Useful HP without Dezip (and crackle)

Postby » Mon Oct 29, 2018 3:34 pm

I wanted to follow up and point out that the "inertia" plugin by Acrobat that uses a slide interferes with a slider or knob's ability to be automated.

This weekend I spent time working on a timer system (using increment primitive and multiplying int by 0.01) which does the same thing. When I'm ready to revise this post I'll point it towards My recent LA Tools, which is available here:

When I update LA Tools I will provide this updated example which prevents this colouring issue and I assure that it gracefully fades away. It's a pity because I like the way that Acrobat's slider function operated; it seemed ideal.

Perhaps I would be able to make something similar by combing quantisation and increment timers. The only issue though would be for the to refresh and reset upon a change occurring (happens all the time :)).
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Re: Useful HP without Dezip (and crackle)

Postby » Fri Nov 02, 2018 2:25 pm

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