Download - Advanced FM: Programming & Verification
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Deborah Edwards, MS,CCC-ADawn Ruley, AuD, CCC-A
Advanced FM: Programming & Verification
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Overview
• Introduction to FM
• FM Verification Procedure
• Tour of FM Successware
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What is a wireless FM system?
12
• 1. The teacher or primary speaker wears a wireless microphone called the transmitter.
• 2. The student wears a miniature FM receiver. This receiver picks up the teacher’s signal. The receiver may be worn alone on the ear or attached to a hearing aid or cochlear implant.
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Frequency standard
• 216 – 217 MHz-band (also called N-Band)North and South America
• 23 Channels available
• Received Primary Status from the FCC 2003 for ALD
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Why FM?
Why does someone need FM if he/she already wears hearing aids?
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Three Obstacles for HA Users
• Background Noise• Reverberation• Distance from the sound source
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FM Priorities
• Audibility of person wearing FM transmitter/microphone
• Audibility of self
• Audibility of others at a variety of distances
Lewis and Eiten, Boystown
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SNR at ear level for different technologies
40 45 50 55 60 65 70 75 80 85
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
No FM
Traditional FM
Dynamic FM
Surrounding Noise (dB SPL)
SN
R (
dB)
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No FM
Traditional FM
Dynamic FM
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No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
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No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
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No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
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Spe
ech
unde
rsta
ndin
g [%
]
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No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
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No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
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No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
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No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
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Fitting the New Standard
Receiver comes standard at +10 dB Default settings are a good beginning, but what
comes next….When should you measure?What should you measure?How should you measure?What should you change?Do you need more equipment?
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The Phonak FM Offset Procedure (POP)
1. (FM)M652. FM(M)653. (FM)HA904. FM(M)90
Match target
Transparent with curve 1
Not exceed MPO targets
Not to exceed MPO targets
NOTE: (M) means muted environmental mic (FM) means muted FM mic
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Worksheet
FM(M)65 curve (dB)
*(FM)M65 curve
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Resources
•www.phonak.com
•www.eschooldesk.com
•www.FMeLibrary.com
•FM Successware 4.3
•POP Procedure found in FM Successware 4.3 –
Guidelines
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Thank you