On Tuesday 06 October 2009, Christos Ricudis wrote:
> V13 wrote:
> > On Tuesday 06 October 2009, V13 wrote:
> >> ερωτήσεις. Το να αγνοηθούν μερικά mail το πολύ-πολύ να μειώσει το SNR.
> >
> > Αυξήσει
>
> Ναι, αλλα κατα ποσα dB?
An to ypologisa sosta einai ~ 3db (=10*log(2)) an kopei to noise sto miso:
SNRold = S / Nold
SNRnew = S / Nnew
Nold = 2 * Nnew
=> SNRnew = 2 * SNRold
Δdb = db1 - db0
db0 = 10 * log(SNRold)
db1 = 10 * log(SNRnew)
= 10 * log(SNRold*2)
= db0 + 10 * log(2)
Δdb = 10 * log(2)
= 3.01029995664 kai kati psila
.. kapoios apo ee.auth.gr h kati sxetiko as me diorthosei :-)
<<V13>>
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