sound spectrograph

noun
an electronic device for recording a sound spectogram.
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World English Dictionary
sound spectrograph
 
n
an electronic instrument that produces a record (sound spectrogram) of the way in which the frequencies and intensities of the components of a sound, such as a spoken word, vary with time

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Example sentences
The data from a sound spectrograph recorded the frequency components of the sound on each frame of the movie.
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