![]() The vocoder as both hardware and software has also been used extensively as an electronic musical instrument. The receiving unit needs to be set up in the same channel configuration to resynthesize a version of the original signal spectrum. The advantage of this method of "encryption" is that no 'signal' is sent, but rather envelopes of the bandpass filters. Its primary use in this fashion is for secure radio communication, where voice has to be encrypted and then transmitted. ![]() It was originally developed as a speech coder for telecommunications applications in the 1930s, the idea being to code speech for transmission. The decoder applies these (amplitude) control signals to corresponding filters in the (re)synthesizer. In the encoder, the input is passed through a multiband filter, each band is passed through an envelope follower, and the control signals from the envelope followers are communicated to the decoder. ![]() A vocoder ( / ˈ v oʊ k oʊ d ər /, short for voice encoder) is an analysis/synthesis system, mostly used for speech. ![]()
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