How does EAS work?
EAS is the combination of two technologies, each responsible for a specific frequency range. Here is how it works:
- A cochlear implant converts everyday sounds into coded electrical pulses. These pulses stimulate the auditory nerve. The brain interprets these signals as sound.
- High frequency sounds are picked up by the microphone of the DUET 2 Audio Processor and converted into a special code.
- This code is sent to the coil and is transmitted across the skin.
- The implant interprets the code and sends electrical pulses to the electrodes in the cochlea.
- The auditory nerve relays this signal to the brain.
- Acoustic amplification turns up the volume on the sounds that the cochlea is still able to hear. For EAS, only the low frequencies are amplified.
- Low frequency sounds are picked up by the microphone and are digitally processed and separated.
- Sounds are amplified by the loudspeaker located in the ear hook and relayed via the ear mould to the ear canal.
- Sounds reach the undamaged areas of the cochlea responsible for processing low frequency sound.
- The auditory nerve relays the signals to the brain.