54
55
For inter-ear communication between hearing aids, a BER better than
10
-3
is required . The communication is updated every 50 ms (or 20 Hz) .
The hearing aids continue to amplify based on the last saved settings
even when the transmission range is exceeded or when communication
is interfered .
Wireless Security Measures
Security of the wireless signals is assured through device system design
that includes:
• Individual MAC address for each unit which is checked during each
transmission .
• A built-in pairing table which specifies valid and legitimate pairing
among units
• A proprietary Widex communication protocol which checks the package
numbers during each transmission .
• A Cyclic Redundancy Check (CRC) to check data validity and correct
errors .
