Oh yeah... we're into it now, are we? ;-)) I attached a quickly made Excel spreadsheet (it's in the zipfile) because I guess many readers here can open it and I don't have my good software anymore as I'm retired ;-) The graph from the sheet is below this text, you can't miss it (it's a bit big isn't it). Now, count the tops in the positive half of the period... there's 5 of them. That's the fundamental 1 kHz plus 4 odd-numbered harmonics. So, quickly back to the scope and count those tops so you can calculate up to which harmonic your DAC went to create that square wave, which gives you the max. frequency used!
So you only need the odd harmonics of the fundamental, but you need all of them to get a perfect square and even then it'll never really be perfect. So: fundamental + 4 odd-numbered harmonics. The first harmonic is the fundamental itself so we have 1f + 3f + 5f + 7f + 9f. When you look at the formula's I put in, you can change it into 1f + 2f + 3f +4f +5f, ie both odd and even harmonics. See what you get when you change it! The Excel SIN() function is ugly because it take radians as it's argument instead of degrees... so I needed to go from degrees to radians, which is why you see PI() etc. Just change the harmonic numbers. Be careful, the harmonic number is in the formula twice and both must be changed. cheers, Nick. +-------------------------------------------------------------------+ |Filename: squarewave from sine.JPG | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=6011| +-------------------------------------------------------------------+ -- DeVerm ------------------------------------------------------------------------ DeVerm's Profile: http://forums.slimdevices.com/member.php?userid=18104 View this thread: http://forums.slimdevices.com/showthread.php?t=53345 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
