jan 2, 1928 - The Vocoder (Invention)
Description:
A vocoder, short for voice encoder) is a category of voice codec that analyzes and synthesizes the human voice signal for audio data compression, multiplexing, voice encryption, voice transformation, etc. It was originally developed by Bell Labs in 1928 and was used for military purposes. It was only later in the 20th century that artists started using this technology in their music.
How it works?
A vocoder works by analyzing the sound of a modulator signal, which is usually a human voice. The modulator signal is split into many frequency bands. The level of each band is sent as a signal to a corresponding band-pass filter. The filter is set to the same frequency that was analyzed. A sound source, called the carrier, is sent through the bank of filters. The level of each band-pass filter is automatically adjusted to that of the corresponding frequency in the modulator signal. In this way, the carrier is filtered so the harmonic content that passes through is similar to that of the modulator signal.
Added to timeline:
Unit 5 Music Technology In Context Jake Lilley
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