Tutorials and Topics - Peabody Computer Music

Tutorial 11Synthesis:Frequency modulationAn FM subpatch: simpleFM~The simpleFM~ object in this tutorial patch is not an MSP object; it’s a subpatch thatimplements the ideas of harmonicity ratio and modulation index.• Double-click on the simpleFM~ subpatch object to see its contents.The simpleFM~ subpatchThe main asset of this subpatch is that it enables one to specify the carrier frequency,harmonicity ratio, and modulation index, and it then calculates the necessary modulatorfrequency and modulator amplitude (in the *~ objects) to generate the correct FM signal.The subpatch is flexible in that it accepts either signals or numbers in its inlets, and theharmonicity ratio and modulation index can be typed in as arguments in the main patch.• Close the [simpleFM~] window.115