[sdiy] Any synths with SPDIF output?

[Czech Martin]

I always had the impression that noises in the TG77
were related to sample interpolation , rounding, alias and such.
"FM" is done using tables in these chips, it is nonlinear and
can create a lot of such artefacts.

If you compute this stuff using more resolution some artefacts
disappear.

m.c.

> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Glen
> Sent: Donnerstag, 8. Januar 2004 06:57
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Any synths with SPDIF output?
> 
> 
> I was wondering if SPDIF outputs were ever put on any of the digital
> synths? It seems this would be a good way to preserve the 
> integrity of the
> synth's sound, but I don't remember ever seeing this done.
> 
> I'd like to add SPDIF to a Yamaha TG77, but I have no idea how hard or
> expensive it would be to do. The TG77 used 16 bit audio, and 
> at least some
> of the audio is rendered at a 48 kHz sample rate. The 
> internal DACs are fed
> via serial inputs, but I don't know how much "adaptation" the 
> data streams
> would need, to be compatible with SPDIF.
> 
> There are a few artifacts in the analog audio outputs. 
> There's a bit of
> analog background hiss, and what sounds like "interference" 
> being picked up
> from some of the digital circuitry, or perhaps from the LCD 
> EL backlight
> driver. I seem to remember disconnecting the power to the EL 
> driver once,
> and I think there was still a little interference of some 
> sort, but that
> was some time ago and I might be mistaken. 
> 
> Anyway, I was thinking that a SPDIF output would bypass a lot 
> of the little
> background noises I get through the analog output channels. 
> It isn't that
> bad and I could live with a certain amount of noise, if 
> adding SPDIF would
> be a nightmare project, but if SPDIF would eliminate the 
> background noises,
> I'm interested in trying to figure out how to add it.
> 
> 
> later,
> Glen Berry
>