RE: filmscanners: RE: Film Scanners and what they see.

[Austin Franklin]

>Austin wrote:
>> CD player do NOT oversample.  The input data is at 44.1kHz.
>> What they do is interpolate the data at typically 8x the
>> input frequency.  That is NOT oversampling, it is
>> interpolating.  What that does is minimize the
>> requirements on the analog output filter design.

>I know it's interpolation.  I think I mentioned the word interpolation in
>my original message.  Maybe you weren't buying during the late 80's and
>early 90's when all the CD manufacturers were competing against each other
>in a race to have the highest number in front of the words "oversampling
>filter".  Their words not mine, right or wrong, and it's really irrelevent
>to my point.

I've been around for a while ;-)

>My point was - I wonder whether digital interpolation would be useful in
>a scanner design to smooth the output?

Every scanner I know does offer interpolation as how they do their higher 
than native output...  Why would you want to smooth the output?  If you 
wanted to do that, why not do it in PS?

> PS A lot of CD players these days use bitwise filtering not overclocked
> interpolation anyway - possibly another technique to look at.

Can you name a CD player for me that does "that"?