Word: spectrograms
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Dates: during 1970-1979
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Conceived in 1941 as a way for the deaf to "read" speech, the voice-print machine analyzes patterns of frequency and amplitude, transcribing each variation into a spectrogram. One of the chief developers, Physicist Lawrence Kersta, claims that everyone's voiceprint is as unique as his fingerprints, and that any skilled technician can identify a voiceprint with more than 99% accuracy. Other scientists have disputed his claims...