Oversampling for noise reduction

Started by March 16, 2007
```On Mar 17, 4:44 pm, Jerry Avins <j...@ieee.org> wrote:
> stevepierson wrote:
>
>    ...
>
> > Ok, so the only way to get around this is to add higher frequency
> > noise, which I can do by relaxing the output filter, I do this and the
> > oversampling now brings down the noise, but, and here is the rub, when
> > I relax the filter the overall noise increases, so the net result is I
> > have the same noise as I did in the beginning :(
>
> When starting out on the wrong foot, it's easy to march off into
> absurdity. Adding noise for the pleasure of eliminating it later is an
> example.
>
>    ...
>
> Jerry
> --
> Engineering is the art of making what you want from things you can get.
> =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF

i'll forward your tidbid to the dither folks....

```
```stevepierson wrote:

> On Mar 17, 4:44 pm, Jerry Avins <j...@ieee.org> wrote:
>
>> When starting out on the wrong foot, it's easy to march off into
>> absurdity. Adding noise for the pleasure of eliminating it later is an
>> example.
>
> i'll forward your tidbid to the dither folks....

If the dither folks are knowledgable and honest I'm sure they will
agree with Jerry.

Dither is applied during re-quantisation of a signal (ie converting
from float or 24 bit integer to 16 bit integer) by adding noise
which aims to make the discrete tones that are a by product of
re-quanisation less obvious.

See :

http://en.wikipedia.org/wiki/Dither

Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo
+-----------------------------------------------------------+
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