[sdiy] High Q Resonators/digital drums

[Andre Majorel]

On 2011-06-17 14:28 +0200, Thomas Strathmann wrote:
> On 6/17/11 10:38 , Andre Majorel wrote:
>
> >The most obvious difference is the high-hat. It sounds much
> >more forward in the second half. Perhaps the closed high-hat
> >colours the perception of the bass drum underneath.
> 
> Out of curiousity I listened to the demo again, this time with
> headphones and a signal chain I know pretty well. I still can't
> honestly say that I feel that the hi-hats make all the difference.

There may be a difference in the bass drum but I'd have to hear
it in isolation to be sure. High frequencies mask low
frequencies.

> Perhaps my ears are immune to some of the "natural" deviations
> that occur when you compare two units that necessarily suffer
> from component tolerances and drift.
> 
> >If the TR-808 has op-amp buffers, their limited slew rate might
> >make a difference.
> 
> Wouldn't low slew-rate amount to low pass filtering (integration)

Depends on the input. Slew rate can turn a sine into a triangle.

> or would it be a bad idea to use a first-order lowpass
> (averaging filter) as a first approximation?

No reason to rule it out though I would look into the
frequencies of the high-hat oscillators first.

-- 
André Majorel http://www.teaser.fr/~amajorel/