= sonograph, n. 2.

an instrument for analysing the frequency composition of sound.

Frequently in form sonagraph. Also with capital initial. An instrument which analyses sound according to its component frequencies and produces a…

an instrument for analysing and displaying the frequency composition of sound, used esp. in studying birdsong; a diagram produced by such an…

An electronic device which provides a continuous graphic record of melody, speech, etc., usually showing how pitch and loudness vary with time.

An instrument used for photographing a spectrum. More widely, any apparatus for producing a visual record of a spectrum (optical or otherwise). Cf. m…