Hi Andy, Thanks a lot, I wasn't expecting so much help. I will read the flowgraph and I will try to understand it. I've added an extra sine with double the frequency to simulate the first harmonic and when I transpose it I find lots of frequencies. Is this expected?
I will try to find a solution for it once I understand more how it works. Thank you so much, I hope you've enjoyed with it :) Cheers, Murray On 13 March 2016 at 19:36, Andy Walls <[email protected]> wrote: > On Sun, 2016-03-13 at 12:00 -0400, [email protected] > wrote: > > Message: 10 > > Date: Sun, 13 Mar 2016 12:29:07 +0000 > > From: Murray Thomson > > Hi Murray, > > > > > Hi, > > > > This is probably an easy one but I'm stuck and i could do with some help. > > My goal is to get a musical note from the microphone and shift its > > frequency to transform the note to a different scale. For this to > happen, I > > need to multiply all the frequencies for e.g. 1.5. > > > > I can achieve an octave of the signal multiplying it by itself (doubling > > the frequencies). I thought I could do this resampling the signal but now > > I'm not too sure. Do I need to use an FFT block for this? > > > > I would appreciate if someone can suggest the best way to go or point me > in > > the right direction. > > Since I was recording my daughter's violin audition video today, I was > in the mood to play around with this one. > > Try the attached *grc file. Note that you need headphones, or just keep > the speakers away from the microphone, or the feedback will ruin > everything. > > Run the flowgraph and select "Up 5th" from the "Transpose" GUI widget to > multiply by 1.5. > > Double check my variables for A3, B3, C4, D4, etc. and the QT GUI > chooser widget to make sure I got all the ratios right. > > > Thanks, > > Murray > > Regards, > Andy >
transpose2.grc
Description: application/gnuradio-grc
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