Axtell's Notes: June 17

The BigGUI class has all but two features working! Those that aren't working are windowing (because I haven't gotten around to setting it up) and showing the FFT of a specific sample (haven't figured out how to do this yet.)

Changing buffer size, sample size, the text file to write to and the sound file to read from all work. SPLIT splits the given .wav into smaller .wavs (each of the length given in the sample length text field) and does all the math so that Show Peaks and Show Notes are fast. Show Peaks makes the graph which is the highest (or few highest) frequencies of each mini .wav (x-axis is time, y-aixs is frequency in MHz.) Show Notes makes the array (note by octave) the number in each cell represents how many times that note of that octave occurs in the given .wav.


So Tayloe's code is now completely integrated with mine in BigGUI. NoteFinder and PeakData are both graphed through GraphSplitter (a boolean determines which to graph). I thought I was having problems with the boolean because clicking on Show Notes did nothing and clicking on Show Peaks did what it should and what Show Notes should. Eventually I switched to two classes (GraphPeaks and GraphNotes) to avoid the boolean, but that didn't change anything. I finally thought to look at where I initialize the buttons and sure enough Peak and Note listeners were both controlled by the Show Peaks button. Luckily I had saved the GraphSplitter class and that all works as it should now.

I might have made a bit of progress on the finding decibels side of things. Audacity's formula to scale their amplitudes is value[i] = 20. * log10(sample[i]) according to a few forums I found about it. This scales the sound to a range of -1 to 1 dB. I'm not sure if this is accurate, but since we have access to Audacity's code, I'll look at that tomorrow and see if I can find something useful.

Tomorrow, besides looking at Audacity's code, I hope to get the windows and get FFT features of BigGUI working, clean up BigGUI and other new classes, and start looking at constant Q transforms.