Title:

Enhanced Adaptive Receiver System

The Enhanced Adaptive Receiver System (EARS) was designed to prevent hearing damage while allowing one to continue to hear their surroundings without harm. This is accomplished through a microphone affixed to the outer shell of safety earmuffs, which pass through a system designed to filter noise and control the voltage of the input. Lastly, the signal is passed through an audio amplifier and out of a speaker in the inner ear of the earmuff, enabling the user to safely hear what is going on around them without having to compromise the safety of their ears despite a (potentially) loud environment. Design research began with answering the question of how to regulate a voltage by preventing it from exceeding a certain maximum but without clipping or distortion of the original signal. During this discovery process, it was determined that a voltage limiter was best suited for this purpose, as the limiter by design accomplishes those things. Filtering techniques developed over the course of undergraduate study were also utilized to introduce filters between the typical frequency of Western language (Between ~500Hz up to ~8000Hz) to reduce ambient noise and improve sound clarity. The volume of the output and limiting effect of the system were both made adjustable through trimmable potentiometers. The device is self-contained and portable, utilizing 9v rechargeable batteries for power. Applications of this device could potentially include practical uses, such as at gun ranges, loud concerts, drag races, etc., as well as for personal use by individuals with sensitivity to loud, sudden noises.

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