Many synth of the same era use LC filters to take away the sampling frequency from the signal, is the most efficient way, no distortion (for those little signals) and no noise added by other opamp or transistor stages and easy to tune Inviato dagli anelli di saturno > On 16 Mar 2015, at 09:11, gordon@... [CZsynth] <CZsynth@yahoogroups.com> wrote: > > On Sat, Mar 14, 2015 at 10:38:00PM +0000, Daniel Boles db0451@... [CZsynth] wrote: > > all competently designed digital synths, assuming they don't use > > oversampling and digital filtering - have analogue reconstruction lpfs to > > get rid of high-frequency imaging (aliasing is a misnomer here and in most > > other cases). these filters are non-resonant and thoroughly uninteresting > > for anything except protecting tweeters and precluding intermodulation > > distortion. i cannot stress enough how mundane a reconstruction filter is - > > and how a little research in digital audio would reveal it as one of the > > simplest concepts therein. > > I'm surprised that they use a little ferrite LC filter, quite honestly. Surely that had to be more expensive than an RC filter and an opamp? They were really really common in digital synths and samplers at one time, but you don't see them now. > > -- > Gordonjcp MM0YEQ > >
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Re: [CZsynth] Re: CZ-1 has 2 LPFs inside. What are they? (Picture)
2015-03-16 by Carlo