Cytomic "The Drop" Resonant Filter

[HcDoom]

Andy, when we can expect final release?

[camsr]

What RW filter is the ladderT supposed to emulate?

[andy-cytomic]

Andy, when we can expect final release?

All going well the final release should be in around 2 months from now. All the R&D is done so the remaining tasks have no risk - they are just cleanup and things I've been putting off until I finished all the models.

[andy-cytomic]

What RW filter is the ladderT supposed to emulate?

The LadderT is short for transistor ladder. The PRD is to hint at it being based on the Prodigy. I've increased the dc blocking capacitor values (to pass more bass) and also modified the circuit to include no loss of bass with resonance increase, but otherwise it uses the same components and values as in the original circuit.

[andy-cytomic]

I've done the final level matching and de-clicking code so here is a little example of switching between all the different low pass filters with the same baseline playing:
https://soundcloud.com/cytomic/the-drop ... s-circuits

And a better quality mp3 of the same:
http://cytomic.com/files/thedrop-lp-circuits.mp3

[sqigls]

Looking forward, as always

[woodsdenis]

I've done the final level matching and de-clicking code so here is a little example of switching between all the different low pass filters with the same baseline playing:
https://soundcloud.com/cytomic/the-drop ... s-circuits

And a better quality mp3 of the same:
http://cytomic.com/files/thedrop-lp-circuits.mp3

Rock on Andy

[n0rd]

Nice one Andy.

[cyphersuit]

Can wait

[andy-cytomic]

Some more progress news for everyone. I've been working hard on optimisations on all the filters.

On my machine at 44.1khz cutoff 800 hz, resonance 75% the current filters take (edit: this much of a single core on my 2.8 GHz Xeon)

Code: Select all

                LP2    LP4
Sallen Key MS2  3.0%   6.0%   
Cascade SH     10.5%  10.5%

The new filters take:

Code: Select all

               LP2    LP4  
StateV  OSR    2.25%  4.5%   
SallenK MS2    1.5%   2.75%  
SallenK MS1    2.0%   4.0%  
Cascade SHJ    2.75%  2.75%  
LadderT PRD    1.5%   1.5%   

               HP2    HP4
StateV  OSR    2.25%  4.5%
SallenK MS2    1.75%  3.25%
SallenK MS1    2.5%   5.25%
Cascade SHJ    4.75%  4.75%
LadderT PRD    3.5%   3.5%

So that is a x2 speedup for the Sallen Key MS2 and a x4 speedup for the Cascade SH

I'll hopefully have this build in peoples hand in the next two weeks, and the v1.0 finished by the end of March / start of April.

[sqigls]

tasty
thank you
here's a beer

love your work Andy

[Kenit]

Wow
Nice news.
Looking forward to the next build.

[VariKusBrainZ]

Some more progress news for everyone. I've been working hard on optimisations on all the filters.

On my machine at 44.1khz cutoff 800 hz, resonance 75% the current filters take:

Code: Select all

                LP2    LP4
Sallen Key MS2  3.0%   6.0%   
Cascade SH     10.5%  10.5%

The new filters take:

Code: Select all

               LP2    LP4  
StateV  OSR    2.25%  4.5%   
SallenK MS2    1.5%   2.75%  
SallenK MS1    2.0%   4.0%  
Cascade SHJ    2.75%  2.75%  
LadderT PRD    1.5%   1.5%   

               HP2    HP4
StateV  OSR    2.25%  4.5%
SallenK MS2    1.75%  3.25%
SallenK MS1    2.5%   5.25%
Cascade SHJ    4.75%  4.75%
LadderT PRD    3.5%   3.5%

So that is a x2 speedup for the Sallen Key MS2 and a x4 speedup for the Cascade SH

I'll hopefully have this build in peoples hand in the next two weeks, and the v1.0 finished by the end of March / start of April.

What are your machine specs?
Those figures look really good!

[andy-cytomic]

What are your machine specs?
Those figures look really good!

My Machine is a 2.8 GHz Quad-Core Intel Xeon. These figures are calculated by running the plugin with the filter switched off at x4 oversampling to get a baseline measure of cpu, then switching on the filter and dividing the difference by 4.

[xiphiuz]

That's great news and impressive work Andy

Just for the record: Which OS, host, soundcard and buffer settings did you use?