Tanggal :September 27, 2020

pd28. Additive Synthesis in Pure Data

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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.

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