In reply to Frank Znidarsic's message of Mon, 22 Oct 2018 18:33:05 +0000 (UTC): Hi Frank,
I think voice recognition software already exists? Maybe you can find and adapt or add to it. [snip] >I made the app MUSICAL SCORE that reads MIDI commands from a MIDI device and >displays the notes on a musical score. I have been asked a number of times by >violin and acoustic guitar players that they would like to see their notes on >musical score. I would like to see the notes of my voice. This app has >never been done so it was worth a try. I would call it Voice Score. >I figured out how to read the raw sound data from the microphone into an array >of about 50ms in duration. This involved about 5000 amplitude points >(+-32000) of data taken at an intervals off 44100 hertz. Now all that I would >need to do in extract the frequency from this array of points of amplitude. >Simple yes, the hard part was done! >A Fourier transform would involve the integration of the sin and the cos >functions for every note of the musical scale. This would be too slow for a >prompt musical score. >I tried the zero crossing method that counts the number of times the sound >data crosses the zero axis. The frequency jumped all over the scale. >Harmonics really threw the calculation off. I had no idea that so many >harmonics crossed the zero axis. Next it tried filtering to remove the >harmonics without effecting the highest frequency that I wanted to measure, >about 1500 HZ. After days of adjusting I finally got the thing to read the >frequency of pipe organ, see the attached video. No matter what I tried I >could never measure more complex sounds. No algorithm seemed to work at all >with the human voice. >Perhaps I have another failure. I will take a break and think about it. I >hate failures but it was a learning experience. > >http://www.angelfire.com/scifi2/zpt/temp/freq.MOV > >Frank Znidarsic Regards, Robin van Spaandonk local asymmetry = temporary success
