If you've listened to pop music in the past 40 years, you've probably heard more than a few songs with a robotic sound. That's thanks to the vocoder, a device invented by Bell Labs, the research ...

The vocoder—code name Special Customer, the Green Hornet, Project X-61753, X-Ray, and SIGSALY—started distorting human speech in earnest during World War II, in response to the excellence of German ...

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