[sdiy] Re: Inexpensive 16 bit DAC?

[Kevin Lightner]

>Ok, that is my wrong knowledge. Thanks so much..
>
>Mete
>
>--- Gabriel Lindeborg <gabriel at lindeborg.org> wrote:
>>  The D-50 is digital only (no analog filters other
>>  then fixed ones at the
>>  output), and I believe the samples are 8-bit.
>>  LA-synthesis uses samples,
>>  digital oscillators, ring-modulation and digital
>>  filters all in the
>>  digital domain. The reverb and chorus are also
>  > digital, and propably the
>  > reason for the 20-bits of the output DAC.
>  >
>  > //Gabbe


Sorta..... :)

The L/A synthesis chip has a 20 bit address buss and a 16 bit output buss.
The reverb and chorus also have a 16 bit output buss, but control is 
sometimes via 8 bits.

The conversion is actually 20 bits though. Really all for the reverb.
It's broken into an upper 16 bits and lower 4 bit converter using a 
resistor array.

Keep in mind that actual resolution of the samples is kind of hard to 
really judge.
Roland is famous for resampling companded data and other goodies.
The TR707 started out as analog, was sampled to 16 bits  and I think 
it finally ends up as only 6 bits of data in the machine with the 
compression and expansion added to expand it.


-- 
Regards,
Kevin Lightner

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