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An Ear-Level Instrument

The ELI DirX Ear-Level Instrument (Figure 1) is the smallest audio Bluetooth device on the market, with dimensions of 27 mm x 16 mm x 11 mm and a weight of 5.2 grams. Three pins connect it to any behind-the-ear hearing aid that uses a Europlug standard direct audio input (DAI) connector (Figure 2). The pins on the ELI DirX module rotate 270 degrees to accommodate either a right or left hearing aid.

ELI DirX provides bidirectional digital communication between a Bluetooth-enabled mobile phone and a hearing aid. Since the signal being transmitted between these devices is digital, it is not subject to the same sources of interference as other types of wireless transmission, such as analog FM or analog inductive transmission.

In this Bluetooth application, the ELI DirX module is the slave, while the mobile phone with which it communicates is the master device. To pair ELI DirX to a mobile phone or other Bluetooth master, the user holds down the button on the ELI DirX module when it is within 10 meters of the other device. The light emitting diode (LED) of the ELI DirX module blinks red and green, indicating that it is in the pairing mode and then glows a steady green when pairing is complete. Connecting is accomplished by clicking icons on the mobile phone screen, and reconnecting is as simple as pressing a button on the ELI DirX module or clicking icons on the mobile phone.

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