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See the following figure. The spectrogram shows frequency information across the vertical axis.

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First read the chapter on acoustic analysis in ladefoged s a course in phonetics or better yet take a course based on ladefoged s elements of acoustic phonetics or johnson s acoustic and auditory phonetics.

How to read a spectrogram. This image shows the spectrogram of a sine sweep over pink noise. It will have a lot of random noise that looks like static but through the static you can usually see the faint bands of the voiceless vowel s formants. Here is the same audio file using a spectrogram.

Below is a 30 second section of a spectrogram produced in audacity using its default colour scheme. The black background is silence while the bright orange curve is the sine wave moving up in pitch. A spectrogram is a readout that shows frequency on the vertical axis time on the horizontal axis and amplitude amount of sound energy as either darkness or coloration.

The spectrogram can show sudden onset of a sound so it can often be easier to see clicks and other glitches or to line up beats in this view rather than in one of the waveform views. To select spectrogram view click on the track name or the black triangle in the track control panel which opens the track dropdown menu. Time runs from left oldest to right youngest along the horizontal axis.

The vertical axis shows frequencies from 0 to 10khz and the horizontal axis shows time from 14 00 to 14 30 mins. 2 proven by fourier hence fourier s theorem and fourier transform. The same way you get to carnegie hall.

Louder noise at a particular frequency at a particular time. On a spectrogram it looks a little like a cross between a fricative and a vowel. Lowest frequency content is displayed at the bottom highest frequency content is displayed at the top.

3 the other side of the source filter coin is that you can vary the pitch source. Spectrograms are basically two dimensional graphs with a third dimension represented by colors. In the spectrogram view the vertical axis displays frequency in hertz the horizontal axis represents time just like the waveform display and amplitude is represented by brightness.

Amplitude more randomly rather than. Here are some key terms to remember you can refer to the following figure for where some of these terms appear on the spectrogram. How do i read a spectrogram.

How do i read a spectrogram the same way you get to carnegie hall. Here warmer colours indicate more energy i e. Each of our volcano and earthquake sub groups of spectrograms shows 10 minutes of data with the tic marks along the horizontal axis corresponding to 1 minute intervals.