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

[Robert J. <rob...@da...>]

Wednesday 12 November 2003 14.16 skrev David Olofson:
> 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?
> Just a basic trigger->MIDI converter...

I actually have no idea, I'll ask my brother... 
>
> > 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
> only 7 bits of resolution for velocity, and even 8 bit ADC can
> deliver a lot more than that when analysing an audio rate signal.
> Also, a sample rate that's sufficient to achieve the desired
> transient response time should be enough - which probably means
> significantly less than 48 kHz.
>
> Not sure about how much and what kind of information is useful, but I
> suspect one might get away with even lower sample rates if part of
> the job is done in the analog domain. Half-wave rectifier (or full
> wave, for faster and more accurate response - but that's 3 more
> diodes! ;-) + simple RC LPF, followed by an analog MUX and a single
> ADC? You could easily drive that off the parallel port. (Or the ISA
> bus, if you manage to find one these days. ;-)

Though true all of the above, it's significantly more advanced than what we 
where considering at the moment, version 3.0 can perhaps be to totally omit 
the brain, preferably by hardwiring an ISA bus (muhahahaha), or not. :)

/Robert

>
>
> //David Olofson - Programmer, Composer, Open Source Advocate
>
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>
> |  Free/Open Source audio engine for games and multimedia.  |
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>
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