Health, Sports & Psychology
From sound to meaning: hearing, speech and language
...Artificial speech using just two formants is comprehensible, though in real speech there are higher formants too. These higher formants reflect idiosyncracies of the vocal tract, and thus are very useful in recognising the identity of the speaker and the emotional colouring of the speech. Some of the vowels of English have a simple flat formant shape, like the /a/ and /i/...