Phonetics often involves modern
technology to analyse speech, providing evidence for linguists on the nature of
spoken language. This
spectrogram as used in
acoustic phonetics shows the
frequencies of vibrations involved in the production of six
British English vowels by an
adult male native speaker: from left to right, the vowels as in
bee,
sue,
herd,
or,
bar and
buy. The bands of energy (
formants) are distinctive for each vowel; for example, the lower the bottom formant ('F1'), the higher the vowel is articulated in the
mouth. The greater the distance between F1 and the second-lowest 'F2' formant correlates with how far back in the mouth the vowel is produced. This image was created using the
Praat freeware program.