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HearingAidLow Cost Hearing Aid There are two types of hearing aids – Analog and digital. There are various arguments for both approaches. Regardless of what method the hearing aid works, the architecture of a hearing aid is similar. The best approach would be to combine both digital and analog. The advantages of digital is the cost and reduction in size. Digital Microphones The new MEMS microphones are small and cheap. The hearing aids use a directional microphone. The Filter currently is implemented digitally. It is a band pass filter. The loss of hearing happens in particular frequencies and not across all frequencies. The First Prototype The first prototype is implemented with a TEENSY micro-controller. Working with the TEENSY environment is better because it is a powerful micro-controller based on the ARM CORTEX M4 chip. This chip is used in consumer grade audio equipment. The other advantage is that the designers are familiar and comfortable working with this environment. |