发声效率测量系统的设计与实现

Vocal efficiency reflects the efficiency that vocal folds transforms aerodynamic power into acoustical power during phonation. This paper designs a system to measure the vocal efficiency and it uses air flow sensor, pressure sensor, and sound level meter to measure glottis airflow, subglottic pressure and sound intensity. Through hardware circuit, the processed signals are sent to PIC chip. PIC chip plays the role of a central control system which determines the frequency of signal acquisition and transmission. Further more, it puts the signals to the PC and then the software on the PC can receive and real-time display the signals. In addition, the software can identify the specific points of the signals and after that it calculates aerodynamic power, acoustical power and finally obtains vocal efficiency. Finally, this system is applied to the clinical practice and some comparative researches are done, which indicates that this system can reflect the difference of vocal efficiency between normal and pathological conditions.