TR-808

DSP, Plug-in and Host development discussion.
xoxos
Mr Entertainment
12148 posts since 30 Apr, 2002 from i might peeramid

Post Sun Aug 18, 2019 12:48 pm

having a sniff around and noticed jos3 2014 publications on modeling the 808 cymbals and kick. unfortunately they too big to attach (or sticky ha) here, which would be nice to do. so pasting the titles

A PHYSICALLY-INFORMED, CIRCUIT-BENDABLE, DIGITAL MODEL OF THE ROLAND
TR-808 BASS DRUM CIRCUIT

The TR-808 Cymbal: a Physically-Informed, Circuit-Bendable, Digital Model


having had a fair go at this myself, i compared what i retained and eg. did not match the figures for oscillators, my results were derived by sample analysis.
The six oscillators have nominal frequencies (or ranges)
of 205:3, 369:6, 304:4, 522:7, 359:4–1149:9, and 254:3–
627:2 Hz. Oscillators #5–6 have internal trimpots (TM2
and TM1) in series with their resistor, for factory tuning to
specific frequencies (800 and 540 Hz, respectively).
you come and go, you come and go. amitabha neither a follower nor a leader be tagore "where roads are made i lose my way" where there is certainty, consideration is absent.

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BertKoor
KVRAF
11237 posts since 8 Mar, 2005 from Utrecht, Holland

Re: TR-808

Post Sun Aug 18, 2019 10:02 pm

Attachments are so yesterday... Link!!!

https://www.researchgate.net/publicatio ... um_Circuit

But what were your findings then?
We are the KVR collective. Resistance is futile. You will be assimilated. Image
My MusicCalc is back online!!

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Skupje
KVRist
379 posts since 26 Oct, 2018

Re: TR-808

Post Tue Aug 20, 2019 8:05 am

Kind of figures in the analog domain to do it like this, it will probably pack a whollop to do it like that. Thanks for the read!
xoxos wrote:
Sun Aug 18, 2019 12:48 pm
having had a fair go at this myself, i compared what i retained and eg. did not match the figures for oscillators, my results were derived by sample analysis.
I was thinking the machine used a sample itself. But the results can't be that different right? It does sound richer harmonically to my ears, lets try it :P
Last edited by Skupje on Tue Aug 20, 2019 10:15 am, edited 1 time in total.

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Skupje
KVRist
379 posts since 26 Oct, 2018

Re: TR-808

Post Tue Aug 20, 2019 8:47 am

Thought I'd do a calculation by hand based of this: https://www.semanticscholar.org/paper/T ... 8/figure/0 Figured I'm too lazy to do it :D

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Skupje
KVRist
379 posts since 26 Oct, 2018

Re: TR-808

Post Tue Aug 20, 2019 9:20 am

A quick and dirty hack, but the harmonics seem to be somewhat close. Maybe with some carefull tweaking of the levels ittl be sameish?
FakeHat.zip
Through resonant 6pole for some reakon , normally Q factor..
FakeHat2.zip
Using VA style resonance on stock filters, too much poles regardless. Closest yet.
FakeHat3.zip
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Skupje
KVRist
379 posts since 26 Oct, 2018

Re: TR-808

Post Wed Aug 21, 2019 3:32 am

This guy really did some masterpieces, must have been sitting there tweaking stuff untill it was yust right, so much fun reading these papers. :hihi: Built my own filter to do it, it's a driven pulsed network through a 1 "2" pole bandpass filter.. Not a direct copy of the frequencies used. On a somewhat clean setting. It has a thumpier sound than a straight up sinewave.
RDK3.zip
RDK2.zip
RDK1.zip
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