synth: describes the type of carrier that'll be used, and how to combine it with the envelope.Įach of these are documented below, in the same order. envelope: describes how the envelope is extracted. synthesis_filters: describes the filter bank used for synthesis. analysis_filters: describes the filter bank used for analysis purposes. This document describes how to setup the parameter structure p. The function returns y, the vocoded version of x. fs is the sampling frequency and p is a structure with all the parameters. The said function is called like this: =vocode(x,fs,p). The vocode() function is supposed to cover a lot of cases, and therefore receives a rather complex set of parameters. Finally, always check for the last version at. It comes with absolutely no warranty, and is only made available for information purposes. Know what you are doing, and do not assume that this code is foolproof. If this is not the case, get in touch with someone with experience with vocoders as it is very easy to choose the wrong parameters. 
The code base was originally produced by Stuart Rosen, later modified by Bob Carlyon, and since more or less completely rewritten in a more modern style and with many additions.ĭisclaimer: This manual is written assuming the reader has some notions of how a vocoder works.
The code in this section is used to implement various vocoders, generally used to simulate acoustically what cochlear implant users experience through their device.
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