Hi, Thanks for the reply. I put my comments inline, so see below.
On Thu, 2009-02-05 at 05:11 -0800, c_c wrote: > Hi, > > Ed Kapitein wrote: > > > > ... so when playing a G the tuner hears a A. > > > Well, I only own two accoustic guitars - and it seems to be quite accurate > for me. But then fundamental freq detection is not a guarantee with the > signal processing I'm doing. There are many things that can throw the tuner > off - like background noise for eg or the particular characteristics of the > guitar. > > So, here are some questions that would help me understand the approach to > take to make the program more accurate. > > Are you using an accoustic guitar? Yes, vincente sanchiz 38B, beautiful instument btw. I do have another one, a bit older and of less quallity, i will try that one later tonight. > Is the tuner consistently hearing a higher note? It switches every now and then. the G is almost always regonized as an (out-of-tune) low A, but sometimes it switches to te correct G. > Could you verify by using some other tuner what the error is? the other tuner i have has no frequency scale, just a led bar indicating way to low, to low, right, to high, way to high. > Could you try after keeping the freerunner really close to the guitar? I almost inserted it! without any difference. i also adjusted the volume to no avail. I could record the sound of my strings and send them to you, if that would help debugging the problem. Please let me know if you need more info, i will make some pure sinus waves at the right frequency, to see if that does work. Kind regards, Ed > > Ed Kapitein wrote: > > > > is it possible to select manually which string you try to tune? it could > > filter the input signal at that frequency and perhaps make recognizing the > > correct tone easier. > > > Well, the current method I'm using (FFT followed by a harmonic spectrum > product) wont be affected by knowing which string you're tuning. > Then again, I could use another method of determining the fundamental freq > (goertzel algorithm) perhaps, which would need to know the target freq. > Though that will be totally different program. > > So, right now, I would prefer trying to get some feedback and improving the > code to see how it can be made more accurate. And your feedback would help > the most since you're the first one to tell me its off :-) > _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
