SynthMaker

designing tip- parallel and cascade

Archive · 2005 4 old posts

From the original SynthMaker forum (2004–2014), with its members’ names and dates.

sambean ·

You all may already know this but I've just thought of a technique to implement cascaded mono modules with poly components..

It's been mentioned before about using the pack and unpack modules to perform 4 mono or 2 stereo parallel functions with one poly component, for example the 4 band distortion mentioned..

For those not sure, the pack module can bundle 4 mono channels into one poly channel, this can then be processed with one poly module, using 4 times less processing power (control parameters can also be packed with a small workaround so it could be possible to say have 1 lowpass, 2 bandpass, and 1 highpass from a single poly filter component i.e. a simple frequency splitter)

It's also possible to perform cascade or serial processing using the pack and poly components by connecting the pack and unpack modules together offset by 1 and feeding back the poly module, for example 4 series allpass filters can be made using:

So the signal path is

In -> poly channel 1-> poly channel 2-> poly channel 3-> poly channel 4->Out

So for example using both thes techniques it should be possible to make the freeverb port with just 2 poly components: 1 parallel poly comb, and 1 series poly allpass..

Hope this is clear and useful

Sam

Shifrin ·

sambean wrote: It's also possible to perform cascade or serial processing using the pack and poly components by connecting the pack and unpack modules together offset by 1 and feeding back the poly module, for example 4 series allpass filters can be made using:

That's clever, I was aware of how to implement parallel processing - but this is a great way to do serial processing. Nice one 🙂

sambean wrote: So for example using both thes techniques it should be possible to make the freeverb port with just 2 poly components: 1 parallel poly comb, and 1 series poly allpass..

Indeed, I had intended on modifying the schematic to replace the parallel comb filters with poly versions using pack/unpack - seems now we can do that with the serial allpasses too! Wowzers, it was already fairly low on CPU too!

Hopefully when I get some time I'll make these updates (as well as denormal fixes) - unless yourself or someone else does it first 😉

Thanks,

Shif.

skOre ·

What a great thought!

Tom7777 ·

What a great idea 🙂 Nice one

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