The modulator signal is split into many frequency bands. However, they were used to send encoded messages during the Second World War.Ī vocoder works by analyzing the sound of a modulator signal, which is usually a human voice. Unfortunately, the voice reproduction of these early systems was not great and they were never used for this purpose. Its intended use was to reduce the bandwidth of voice information, allowing it to be transferred across further distances. The vocoder was developed in 1928 by Bell Labs, and first demonstrated in 1939 at the New York World’s Fair.
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