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Based on the TI TMS320C6745 floating-point microprocessor, the prototype system is powered by a single 3.7 volt lithium-ion rechargeable battery. The battery is recharged through the USB interface connected to a standard PC USB port or an AC adapter with a Micro USB output connector. On-board switching regulators provide the required 1.2V, 1.8V, and 3.3V voltages from the 3.7V battery. The daughter board contains four LEDs and a noise-canceling microphone(s), designed to be installed in the glasses and receive phantom power from the main board through 15 an all-in-one ribbon connector. (Four LED was included to allow testing of a fourth possible visible cue, such as pitch information for tone languages and prosody. Two microphones would allow directional signal processing for noise suppression.) The on-board AIC3106 audio codec transmits
the analog signals captured by both the internal and external microphones to the microprocessor.The codec control interface is programmed by the microprocessor through the I2C bus.