Post on 14-Jan-2016
description
Deborah Edwards, MS,CCC-ADawn Ruley, AuD, CCC-A
Advanced FM: Programming & Verification
Overview
• Introduction to FM
• FM Verification Procedure
• Tour of FM Successware
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.
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
Why FM?
Why does someone need FM if he/she already wears hearing aids?
Three Obstacles for HA Users
• Background Noise• Reverberation• Distance from the sound source
FM Priorities
• Audibility of person wearing FM transmitter/microphone
• Audibility of self
• Audibility of others at a variety of distances
Lewis and Eiten, Boystown
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)
No FM
Traditional FM
Dynamic FM
No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
No FM
Traditional FM
Dynamic FM
0
10
20
30
40
50
6070
80
90
100
Spe
ech
unde
rsta
ndin
g [%
]
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?
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
Worksheet
FM(M)65 curve (dB)
*(FM)M65 curve
Resources
•www.phonak.com
•www.eschooldesk.com
•www.FMeLibrary.com
•FM Successware 4.3
•POP Procedure found in FM Successware 4.3 –
Guidelines
Thank you