Input analog filtering to enhance triggering

[daniele99]

I've read in a secret case that roland modules have a simple analog low pass filter and a DC block on input stage. My old PM16 have those,too (i opened it to see what's going on.. and i saw a lot of condensers and analog components...)
Dmitri, do you think these could make any difference compared with MD considering its detection algorithm?
Only curious...

[dmitri]

MegaDrum does filtering in software - it's much more flexible then if it's done using hardware.

[angr77]

Interesting question. I got my hands on the td-7 and td-8 service manuals...and yes...there are some passive components on the input stage. I got tempted to test so i have built some stuff but have not tested it yet. I am in general satisfied with the MD triggering...but in my journey to always reach the optimal...I thought, why not give it a try from a educating standpoint. I have been testing and comparing my old TD-6 with the MegaDrum and the algorithm is differing a bit. (no news!) however, it is possible to copy the algorithm with a custom curve and some compression + levelshift. I am going to do some more test...before publish my findings for both the soft part and if the passive component makes any difference.


Best Regards

Angr77

[daniele99]

MegaDrum does filtering in software

I thought it was like that, and i'm sure it's working well or even better (i'm using MD almost every day ). But i wonder why some manufacturers use analog filtering yet. My pm16 is old and his brain is slow...but why they keep analog in nowadays machines?

I am going to do some more test...before publish my findings for both the soft part and if the passive component makes any difference.

Let me know, i'm very curious, thanks!

[dmitri]

But i wonder why some manufacturers use analog filtering yet. My pm16 is old and his brain is slow...but why they keep analog in nowadays machines?

Because they use old and slow MCUs or(and?) slow algorithms.

[daniele99]

Don't be so uppish Dmitri! But...on the other hand, how we may disagree with your sentence? You know i'm a sound eng, and like others sound eng, i always think analog things make all better, but i use mainly digital things!! Cruel destiny...

[dmitri]

In any case it is just my guess. I can rephrase: Because they MAY be using old and slow MCUs or(and?) they MAY be using slower algorithms. Is this better?

[daniele99]

Very polite! Osaka Engs and Admins thank you for rephrasing..hahaha!