34
Antenna Type
Antenna Dimensions
Modulation
Magnetic Field Strength (at 10 m distance)
Output Power (EIRP**)
Range
Center Frequency
Channel
Bandwidth
Data-Rate
Data Flow
Protocol
S.A.R.*
Inductive Antenna
Ø1.9 mm, L - 6.5 mm
PSK, Phase Shift Key
0.09 A/m (1 cm
2
coil; average)
42 µW
<1 m remote to hearing aid / <30 cm
between aids or aid to remote
3.28 MHz
Single Channel Radio
67 kHz
655 kbit/sec (raw channel capacity)
Simplex or semi-duplex capacity
Random access - no collision avoidance
5 nW/kg (BTE) / 13 nW/kg (ITE)
WIRELESS HEARING AIDS
WIRELESS INFORMATION
The following table summarizes the technical details of the wireless technology.
WIRELESS SECURITY MEASURES:
Wireless signal security is assured through device system design that includes:
• A built-in pairing table which specifies valid and legitimate pairing among units.
• A proprietary communication protocol which checks the
package numbers during each transmission.
• A Cyclic Redundancy Check (CRC) to check data validity and correct errors
.
47 CFR Part 15,
Subpart C
EN 300 330-1/2
IEC 60601-1-2
EN 301- 489-1/3
IEC 60118-1/3
ANSI C63.19
ANSI/AAMI
PC69
EN 45502-2-1
RF emissions
RF emissions including
spurious emission
EMC emission
immunity, RF and ESD
Immunity, RF and ESD
Immunity RF near
field immunity test
Immunity RF near field
test immunity test
EMC immunity
EMC immunity
U.S. FCC requirements for intentional radiators.
EMC and radio spectrum matters for short range devices in
the frequency range 9 kHz - 25 MHz.
Medical electrical equipment. General requirements for
basic safety and essential performance. Electromagnetic
compatibility.
Standard for low power transmitters in the frequency range
9 kHz - 40 GHz.
International product standard for hearing aids to ensure
adequate immunity to radio interference from mobile
telephones.
American National Standard method of measurement of
compatibility between wireless communication devices and
hearing aids.
Implantable medical device EMC immunity.
Particular requirements for pacemakers
STANDARD
TEST TYPE
NOTE
EMI/EMC COMPLIANCE
Wireless hearing aids comply with the following EMC/EMI standards:
