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  • See voice-coder. A type of voice coder, usually consisting of a speech analyzer and a speech synthesizer. Note 1: The analyzer circuitry converts analog speech waveforms into digital signals. The synthesizer converts the digital signals into artificial speech sounds. Note 2: For COMSEC purposes, a vocoder may be used in conjunction with a key generator and a modulator-demodulator device to transmit digitally encrypted speech signals over normal narrowband voice communication channels. These devices are used to reduce the bandwidth requirements for transmitting digitized speech signals. Note 3. There are analog vocoders that move incoming signals from one portion of the spectrum to another portion. See also code, communications security.