Austin Franklin wrote:
>
> > Further, at least at first,the
> > "oversampling" CD players were low end units
>
> That's not quite true, they were mid range units, and it was because the
> initial interpolation filters were quite bad, and were only 2x to 4x, and
> certainly did not meet the audio quality that was achievable without them.
>
> > As to complexity, only in
> > terms of the number of parts. Such filter designs are almost cookbook
> and
> > are trivial to model in spice (a computer program for those who don't
> know)
> > variants.
>
> Have YOU ever designed an output filter for a high end audio D/A not using
> an interpolation filter? I've been designing (and have a very high end
> analog engineer who designs) them for 20 years, and they are NOT trivial
> nor are they cookbook. They are in fact an art, and not many people can
> design them well.
I stand corrected. My memory could swear that when they came out they
were at the low end, and not at the high end. Note that
I'm talking about the time when they came out and were the rage.
Your comment about filters not being done very well is something I'd
take to comfirm that they were low end players. But I defer to your
more vivid recollection of the time. I only bought CD players
back then (including the first model out, the CDP-101 as I
recall, made by Sony).
Mike K.
