AW: VP-330 (analog speech synthesis)

[Martin Czech]

> 	>My experiences with ARP Omni's leads me
> 	>to believe that the Reticon chips have a much better high end
> response at
> 	>the same clock speed than the Panasonic chips. Of course it's
> possible that
> 	>this is only true of an SAD512 vs. an MN3002. Dunno.
> 
> The BBD chips have a HF loss all by themselves ?
> I thought it was all because of the anti-aliasing filter,
> but I have never thought any further ... So, do you really
> loose HF in the buckets ?
> 
> JH.
> 
I'd say no specific hf loss, but specific noise.

This is a sampling system and thus the frequency response is multiplied
with the famous sin(x)/x function. This means hf loss, the first zero
appears right at Fs (sampling frequency). Remember the preemphasis bit
and circuit for early cd players ? HF was emphased (sp?) during
recording in order to correct the sin(x)/x loss when playing.
Oversampling made this obsolete, the first zero is now very far away.
Do the chips have very different sampling frequencys ? This would have
the same effect, moving the zero.

Just from my head.

m.c.