2007/12/13, Peiman Khosravi <peimankhosravi@gmail.com>:

so would the best way to do this be to filter a sample before you
transpose it up?

Peiman

On 13 Dec 2007, at 12:38, Mark Van Peteghem wrote:

> Oeyvind Brandtsegg schreef:
>> I don't think a "one stop anti aliasing for any signal" method is
>> technically possible,
>> because aliasing is closely related to the sampling frequency,
>> and once you have a signal that contains partials higher than the
>> nyquist frequency,
>> you get aliasing, and there's no way I know to remove it once it's
>> there (because the harmonics have been folded down into the
>> frequency range that the sampling rate is able to represent).
>
> I see, you can't distinguish between folded frequencies and
> frequencies that are supposed to be there, so you can't do anything
> about it.
>
> --
>  Mark
>  _________________________________________
>  When you get lemons, you make lemonade.
>  When you get hardware, you make software.
>
>
>
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