Usage History of 'spectrogram'

The following chart shows how frequently 'spectrogram' appeared in printed materials over time. For example, the word 'spectrogram' occurred 2 times in books in 1862 and 4,874 times in 2008. From 1862 to 2008, the word 'spectrogram' was used a total of 154,116 times in books scanned by Google. See Reference: Google Ngram project.

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