Spectrograph. A SOUND ANALYSER with graphic output showing the SPECTRUM or frequency content of a sound and its variation in time. It is commonly used for speech analysis, and is sometimes called a sonagraph or visible speech. The graphic output is called a spectrogram or sonagram.

What is the difference between spectrogram and spectrograph?

As nouns the difference between spectrograph and spectrogram

is that spectrograph is a machine for recording spectra, producing spectrograms while spectrogram is a visual representation of the spectrum of a sound changing through time.

What is meant by spectrogram?

A spectrogram is a visual way of representing the signal strength, or “loudness”, of a signal over time at various frequencies present in a particular waveform. Not only can one see whether there is more or less energy at, for example, 2 Hz vs 10 Hz, but one can also see how energy levels vary over time.