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## Re: calculate SNR and watch a binary file

 From: feldmaus Subject: Re: calculate SNR and watch a binary file Date: Sat, 28 Mar 2009 15:44:56 +0000 (UTC) User-agent: Loom/3.14 (http://gmane.org/)

```Hi All,

I also stored another files with data captured from my signal generator.
But this time i increased the amplitude of my sinus signal periodically.
So i can easily verify that i stored data from my signal generator and
nothing else.

I executed the following octave commands:
plot(real(c(1:600)))
<http://img17.imageshack.us/my.php?image=realfrom1to600samples.jpg>
plot(real(c(601:length(c)))
<http://img12.imageshack.us/my.php?image=realfrom601to2e06sample.jpg>
plot(imag(c(1:600)))
<http://img217.imageshack.us/my.php?image=imagfrom1to600samples.jpg>
plot(imag(c(601:length(c)))
<http://img21.imageshack.us/my.php?image=imagfrom601to2e06sample.jpg>

As you can see the amplitude will be increased over time.

However this doesn't looks like as in my FFT-Plot Software !
http://img135.imageshack.us/my.php?image=originalgraphicfromffts.jpg

Therfor i sink each wave is one sample and each sample has all the
information to build one displayed spectrum in my FFT-Plot ???

But how can i do this with octave ?
I doesn't understand FFT. But i think i need the FFT function to display
the data as shown in my FFT-Plot ???

Now i post the Real+Imag Values from (600:700):
24 +  5i
1 + 24i
-23 + 10i
-19 - 18i
9 - 24i
24 +  1i
5 + 23i
-21 + 13i
-21 - 15i
6 - 25i
24 -  2i
8 + 23i
-19 + 16i
-23 - 13i
2 - 26i
24 -  5i
12 + 21i
-16 + 19i
-25 -  9i
0 - 26i
23 -  9i
16 + 18i
-13 + 21i
-25 -  5i
-4 - 25i
22 - 13i
18 + 15i
-10 + 23i
-26 -  2i
-8 - 25i
19 - 17i
20 + 12i
-6 + 24i
-26 +  1i
-12 - 23i
17 - 18i
22 +  9i
-2 + 24i
-25 +  5i
-15 - 21i
13 - 21i
23 +  6i
1 + 24i
-24 +  8i
-18 - 19i
11 - 23i
24 +  2i
3 + 24i
-23 + 12i
-20 - 16i
7 - 25i
24 -  1i
7 + 23i
-20 + 15i
-23 - 13i
3 - 25i
24 -  4i
11 + 22i
-18 + 18i
-24 - 10i
0 - 26i
23 -  8i
14 + 19i
-14 + 20i
-25 -  6i
-3 - 26i
22 - 11i
17 + 17i
-10 + 23i
-26 -  2i
-7 - 25i
20 - 14i
20 + 15i
-7 + 23i
-26 +  0i
-10 - 24i
18 - 18i
21 + 11i
-3 + 24i
-25 +  3i
-14 - 22i
15 - 20i
23 +  7i
0 + 24i
-24 +  8i
-17 - 20i
12 - 22i
24 +  3i
2 + 24i
-23 + 12i
-20 - 17i
8 - 24i
24 +  0i
6 + 23i
-21 + 14i
-21 - 14i
4 - 25i
24 -  2i
10 + 21i
-18 + 17i
-24 - 11i

Regards Markus

```