建筑工程技术

抽象的

Digital Hearing Aid: A Review

Harshini H J

This project expounds microcontroller based binaural digital hearing aid for hearing-impaired people by making use of ATmega328 microcontroller and other circuitries to process the audio signal input by either increasing or reducing the gain level of input audio signal, filter background noise, frequencies compression, save battery power and minimize circuit by making use of the internal ADC of the microcontroller and two PMW pins of the microcontroller as DAC. Hearing impairment among the youths and adults nowadays are in the increase, due wrong use of phones of which every minute of the day someone’s earphone is on listening to one type of music or the other. In other to solve the problem created so to say this project was conceived and given birth to. The different stages of digital hearing aid are designed and then simulated in Proteus software. The main components of this system were the audio input unit which consists of the microphone and its pre-amplifier, the microcontroller which consists of the ADC, the DAC and the audio signal processing, the filter stage and control codes.