Upper level: b310 Voice functions
Functions of the production of characteristics of voice including pitch, resonance and other features.
(additional explanation: In the function to characterize the voice, height, the resonance, and other features of the voice are contained. )
Inclusions: functions of high or low pitch; impairments such as hypernasality, hyponasality, dysphonia, hoarseness or harshness
Lower livel: