You can tell the speaker's mood by his intonation.
Advanced English Dictionary
+noun 1[U, C] (phonetics) the rise and fall of the voice in speaking, especially as this affects the meaning of what is being said: intonation patterns + In English, some questions have a rising intonation. + Her voice was low with a faint regional intonation. Compare: STRESS 2[U] (music) the quality of playing or singing exactly in tune: The violin's intonation was poor.
Collocation Dictionary noun
falling, flat, rising
the rising intonation at the end of spoken questions
He speaks excellent Spanish but with a distinctly foreign intonation.
INTONATION + NOUN
Random quote: The only person who never makes mistakes is the person who never does anything.: Denis Waitley