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Subject: [music-dsp] Build waveform sample array from array of harmonic 

From: "Frank Sheeran" <fshee...@gmail.com>

Date: Sun, April 15, 2018 2:55 pm

To: music-dsp@music.columbia.edu


> I'm currently just looping and calling sin() a lot. I use trivial 4-way

> symmetry of sin() and build a "mipmap" of progressively octave-higher

> versions of a wave, to play for higher notes, by copying samples off the

> lowest-frequency waveform. That still is only 8x faster than the naive way

> to do it.


> I know in theory that a FFT or DFT will turn a CONTINUOUS graph of

> frequency into a graph of time, and vice versa, but if I don't have a a

> continuous graph of frequency but rather an array of strengths, can I still

> use it?


> I thought of making a continuous graph of frequency from my harmonics, but

> 1) sounds quite imprecise and 2) I note real FFT graphs have smooth "hills"

> where harmonics are, rather than point peaks, and am wondering whether I'd

> get expected output if I didn't generate those hills.

are you making wavetables, Frank?� is that what you're doing?


r b-j� � � � � � � � � � � � �r...@audioimagination.com

"Imagination is more important than knowledge."

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