Re: [Linuxsampler-devel] Analogue vs MIDI drumkits, just curious.

[David O. <da...@ol...>]

On Wednesday 12 November 2003 13.52, Robert Jonsson wrote:
[...]
> This signal is connected to what normally is called the 'brain'. A
> bunch of analogue inputs and a sampleplayer engine.
> Normally you use the brains built in sounds, they do however
> (normally) suck :-/... atleast for the cheaper brains.
> The brain does also have midi-out, this is what we where going to
> try and utilize for this "experiment".

Are there any sanely priced "brains" without some crappy sampleplayer?=20
Just a basic trigger->MIDI converter...


> Another way would be to use a soundcard with multiple inputs and
> write a trigger-application, but size and price would go up quite a
> lot :)

OTOH, do you really need full audio quality ADCs for this? Midi has=20
only 7 bits of resolution for velocity, and even 8 bit ADC can=20
deliver a lot more than that when analysing an audio rate signal.=20
Also, a sample rate that's sufficient to achieve the desired=20
transient response time should be enough - which probably means=20
significantly less than 48 kHz.

Not sure about how much and what kind of information is useful, but I=20
suspect one might get away with even lower sample rates if part of=20
the job is done in the analog domain. Half-wave rectifier (or full=20
wave, for faster and more accurate response - but that's 3 more=20
diodes! ;-) + simple RC LPF, followed by an analog MUX and a single=20
ADC? You could easily drive that off the parallel port. (Or the ISA=20
bus, if you manage to find one these days. ;-)


//David Olofson - Programmer, Composer, Open Source Advocate

=2E- Audiality -----------------------------------------------.
|  Free/Open Source audio engine for games and multimedia.  |
| MIDI, modular synthesis, real time effects, scripting,... |
`-----------------------------------> http://audiality.org -'
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