The ModFM synthesis vocoder

Vocoders have been practical tools for synthesis and processing since the original voice encoder by Homer Dudley in the 1930s . They enable the transformation and reproduction of an input sound by the manipulation of its spectral envelope. This paper presents a new variation on the principle utilising the technique of Modified FM (ModFM) synthesis for sound generation. The general design of the vocoder is introduced, followed by a non-mathematical introduction to the ModFM synthesis algorithm. The article is completed with an outline of applications and a discussion of some basic examples of the vocoder operation