/ Examples / NoteStream / Sigmund

Wherein we present the modest details of the Sigmund node (chugin).

Right-click to copy this example to your workspace

Sigmund

Sigmund is sinusoidal analysis and pitch tracking chugin. By Miller Puckette, Ron Mayer, …

inlet connect an input audio signal here.

Controller optionally connect a TimeKeeper or SessionGrid in order to sense performance completion.

NumBands controls the number of key-frequencies, or peaks to track.
Depending on the input signal, at any moment Sigmund locates and nominates from 0 to NumBands "notes". It is advised to equip the player with this same number of instrument instances downstream in order to avoid dropping notes.

MaxFreq sets the highest frequency for Sigmund's tracker to consider. Measured in Hz.

MinPower sets the minimum power within a band to establish it as trackable. Measured in decibels above 0. Lower numbers produce a more sparse result.
The note sparsity for a given MinPower depends heavily upon the input signal.

FFTSize the size of the FFT. Must be a power of 2 and at least 128. You need higher values to track lower frequencies. For example, at 1024 the lowest frequency that Sigmund can track is around 85 Hz.

Beats controls the sample rate for the tracker. It is measured in TimeKeeper Beats.

The Example

In this example, Sigmund produces a pleasant notestream based on the analysis of a speech by US President Obama. We've instantiated 15 instruments in this graph to allow for tweaking of NumBands. In the out-of-box configuration, only 4 instruments are actually put to use.

You can also see that we've routed the notestream to a Note Plot node. Below you can see the plot that is produced. Here time goes North/South and frequency goes West/East. We'll leave you to ponder the connection between our note plot and a Spectrogram.