The Reflection Of Acoustic Analysis Of Voice Disorders

Acoustic Analysis of Voice Disorders Acoustic analysis is an objective leading tool to describe communication disorders. Objective acoustic analysis has the ability to detect pathological voices from students with speech disorders. It is becoming more rapidly increasing in clinical practice for acoustic measurements for many purposes from technological, basic science, health science and other standpoints. The need to store, code, transmit, and synthesize voice signals is the technological perspective that explain the reason for using acoustic analysis. According to the basic science understanding speech production and perception by studying the microphone signal and this explains that the acoustic signal is the common link between them.

High sound indicate a high pitch and the low indicate a low pitch. It depends on the frequency of a sound wave which means as the frequency increases the pitch will increase.
2- Frequency: The number of cycles per second and with a unit called (Hertz)
3- Range: The differences between the highest and the lowest value
4- Intensity: known as acoustic intensity is defined as the power carried by sound waves per unit area.The SI unit of intensity is the watt per square meter (W/m2). Therefore, voice intensity is measured in decibels.
5- Perturbation (jitter and shimmer): are used to describe disturbances or changes in the output of the voice. It is understood to be a temporary change in the vocal system. There are some terms that describe different kinds of like:
Jitter: Short-term (within a single cycle of vibration )changes in Fundamental frequency (pitch). Shimmer: Short-term changes in amplitude (loudness).
6- Noise-to-harmonic ratio: The hoarseness can be measured by this parameter and this can be routinely measured using MDVP (Multi-Dimensional Voice Program). For a signal that can be assumed to be periodic like sustained