Search:

First an example with moving mean. If the output signal is the mean of current input value and the two values before we write:
y[n] = 1/3( x[n] + x[n - 1] + x[n - 2])
Then we can get the impulse...

I haven't used beamer but I think you should use \includegraphics{filename} and load \usepackage{graphicx, color}. But read the beamer tutorial.

With some amplifying can I now hear the signal, but weak.

octave:8> playaudio (200 * x)

"Under OpenOffice, I just did an export to *png of all graphics I am interested in."

Try use pdf instead.
Under OpenOffice, just do an export to *pdf of all graphics you are interested in.

Hello, I do not get any sound in Octave. I'm trying to listen to a vector.

rl@rl:~$ octave -v
GNU Octave, version 2.9.9 (x86_64-pc-linux-gnu).
...