On 2010-06-15 20:49, Jos? Tom?s Tocino Garc?a wrote: > I think that's not the problem, because Gnuplot does not expect a > exact format, it renders whatever it gets. > > The thing is, a usual waveform gets positive and negative values all > the time. Sometimes that's what some DSP algorithms use to measure > frequency, but given the stream has this weird representation, they do > not work. That's what bugged me in first place, so I used gnuplot to > visually check the waveform. > > Isn't is supposed to be a PCM waveform? Yes it is. If your mic has a DC offset you might get only negative or only positive levels though. What sample spec are you using in your call to pa_simple_new? Perhaps you have to specify the exact format for gnuplot, if it guesses wrong. By the way, there are plenty of programs that do simple recording - arecord, parecord, audacity etc should be able to do that as well. // David
