Subject: Re: [linux-audio-dev] power computation
From: Paul Barton-Davis (pbd_AT_Op.Net)
Date: pe maalis 03 2000 - 08:31:13 EST
>example : 4+3=7, sqrt (4*4+3*3) = sqrt(25)=5
>(just because (a+b)(a+b) = a*a + b*b .... +2*a*b.
duh. blush. hide.
to think i was the one of the best math students in my high school ... :)
>Just remember, too, that another way to get the rmspower is to have the
>module (absolute value, talking of complex numbers) of the continuous
>component of the FFT of the signal squared. (Just for MP3 which is in the
>frequency domain, for ex.)
>
>if f is the signal, F = fft(f), rmspower = |F(0)|²
hmm. compute the fft for 26 channels at 96 or even 48kHz in real time?
i don't think so ...
This archive was generated by hypermail 2b28 : pe maalis 10 2000 - 07:23:28 EST