DESIGN AND IMPLEMENTATION OF LOW-COST MEDICAL AUDITORY SYSTEM OF DISTORTION OTOACOUSTIC USING MICROCONTROLLER

New-borns hearing screening and diagnosis are very important for the early discover of any problem that might affect their hearing and consequently their communication. Babies may hear or respond to some sounds, but this is not enough indication that they can hear all the sounds properly. The early diagnosis of hearing efficiency and the functionality of the internal cochlea using Otoacoustic Emission is necessary. In this research, a new device of Distortion Otoacoustic system was designed and developed to be used as prototype instrument for technical college student training. The low-cost microcontroller developed device is efficient and sensitive as it is capable of generating and capturing signals from the external ear canal, as well as analysing signals and determining the efficiency of the inner ear. The proposed algorithm for the microcontroller based on generating two sinusoidal waves with different frequencies that transferred by MP3 shield cable. Analog to Digital Convertor (ADC) will be responsible of the control operation for all the system parts. The input signals are generated by Pulse Width Modulator technology (PWM), and the number of samples are n =28 or n = 256, with frequencies range value 0.5-8 kHz which is the human auditory range that a person can hear.