Hello dear Dr. Nagorni, Yes I did have a look at this tutorial and it has been quite good, but I don't understand the signal which is produced there. I guess this seems to be a digital 101010... signal. But it sounds like an disordered signal and I don't understand how to unfluence the volume or the of frequency this signal. I actually have an algorythm for sine signals but it's too complex for undestanding. The problem isn't the interfacing via snd_pcm_open or snd_pcm_writei but I don't understand the data which is sent. I think the best for me would be an exact description of the PCM Signal description system which is also used in Windows Soundcard interface libraries ( or not? ). Perhaps someone knows good (E)books or tutorials about that.
73 de DO1YPV ( Philipp Vollmer )
