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Spectrograph : The bandpass filters method usually uses analog processing to divide the input signal into frequency bands; the magnitude of each filter's output controls a transducer that records the spectrogram as an image on paper.[1]
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- Charles_Sanders_Peirce
- John Dewey
- Lev Vygotsky
- Jean Piaget
- Quotations related to Kenneth Boulding at Wikiquote