name Vietnamese (Northern) language vi words 1 pitch 80 160 formant 1 87 82 76 formant 2 94 56 42 formant 3 93 52 130 formant 4 110 76 65 formant 5 102 45 20 formant 6 40 50 50 formant 7 60 50 60 formant 8 100 50 40 tone 900 125  1600 100 2400 80