Description

*speq is a spectral processing audio effect, inspired by a Cycling ́74- tutorial-patch entitled "Forbidden Planet" by Gregory Taylor. It is based on a frequency-domain signal processing technique.The input signal is converted to a frequency-domain signal using the Fast Fourier Transform (FFT) to be processed.

The resulting signal is then converted back to a time-domain signal using the inverse FFT (IFFT).

The spectrum to be processed is divided into four sections which can be individually controlled like operating a graphical EQ which also can be randomly modulated by automation.

While every section contains the same maximum number of 32 bands or bins, the FFT's window size differs in each window, as in the low frequency range even small differences can be heard much more clearly than in the high range (e.g. 50 Hz >> 100 Hz = 1 octave | 2000 Hz >> 2050 Hz less than one semitone step).

Demo Video: https://youtu.be/mQka_1OTS7U

Further documentation can be found in the Max for Live device if Ableton Live ́s Help View is turned on.