[sdiy] uLaw DACs in the modern era?

[Tristan]

Yes, the linear decay on the cymbal may have better suited the desired decay envelope for those sounds 
than an exponential decay. 

/Tristan

On Fri, May 25th, 2018 at 4:39 PM, rsdio at audiobanshee.com wrote:

> It would certainly be possible to pre-process the hi-hat samples with an
> exponential compression curve while pre-processing the cymbals with a linear
> compression curve, all carefully coordinated so that the playback envelope
> restores the original envelope.
> 
> Whether they went to the trouble of doing this remains unknown, but they
> certainly bothered to create different envelope circuits for each one, so it
> stands to reason that they might have followed through and developed
> different compression for each category. Then again, we now have the benefit
> of 80-bit DSP for audio, which would have been a bit difficult in the TR-909
> days.
> 
> Brian
> 
> 
> On May 24, 2018, at 3:15 AM, rburnett at richieburnett.co.uk wrote:
> > I suspect that the resulting dynamics of the sound are not exactly
> authentic to the original though.  The hi-hat samples in the TR-909 get
> exponential decaying envelopes applied to them upon playback, whereas the
> ride and crash cymbals get *linear* envelopes applied to them that are
> actually generated from the ROM address counter outputs!  Anyone who's ever
> used a 909 will recall how "compressed" the cymbal samples sound.  I think
> this is largely due to the replacement of the instruments' natural envelopes
> with linear ones!
> > 
> > -Richie
> 
> 
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