VOCODER

Vocoder

A vocoder is an analysis/synthesis system, used to reproduce human speech. 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. The decoder applies these control signals to corresponding filters in the synthesizer. Since the control signals change only slowly compared to the original speech waveform, the bandwidth required to transmit speech can be reduced. This allows more speech channels to share a radio circuit or submarine cable. By encrypting the control signals, voice transmission can be secured against interception.

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vocoder

Noun

  1. Any of several electronic or digital devices or systems for the analysis and/or synthesis of speech


The above text is a snippet from Wiktionary: vocoder
and as such is available under the Creative Commons Attribution/Share-Alike License.

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