pd28. Additive Synthesis in Pure Data

Any periodic signal can be decomposed into Fourier components of sinusoidals at different frequencies. The different frequencies are multiples of the fundamental.

For the triangle wave, tri(f) = constant * (sin(f)-1/9*sin(3f)+1/25*sin(5f)+...). There is a common term of 2 pi t for each sine argument. However for pd that is not relevant. It will be if we are using Python or another language to create the waveforms.

A better approximation will result as we take more terms of the series. It is important to set the phases into the right inlet of osc~.

The mono audio signal shows it is now approximating a triangle wave.