1. Balancing FM Systems. BATOD March Colin Peake Educational Audiologist South of England Cochlear Implant Centre
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2. Balancing FM systems. BATOD March '13
Two Questions ……
Why Use Personal FM Systems?
What is the purpose of balancing FM Systems?
Balancing FM systems. BATOD March '13

3. Why Use Personal FM Systems
FM AUDITORY TRAINING SYSTEMS. Characteristics, Selection, and Use.
Ross, 1991
We know that classrooms are noisy places. We also know that deaf children have difficulty comprehending speech in background noise.
Balancing FM systems. BATOD March '13

4. Why Use Personal FM Systems?
“How long would you listen to a lecture that you couldn’t quite hear? How long would you strain to hear the words of a speaker at a conference?
How much effort,
self-discipline, and
focused concentration
are you, as an adult and competent learner, willing to put into a group listening situation……?
Balancing FM systems. BATOD March '13

5. Why Use Personal FM Systems?
…….Perhaps the most critical question is, why are we surprised when many young children appear distracted, unfocused, undisciplined, and overwhelmed by the demands of classroom listening?”
Carol Flexer in,
FM AUDITORY TRAINING SYSTEMS. Characteristics, Selection, and Use. - Ross, 1991,
Balancing FM systems. BATOD March '13

6. Why Use Personal FM Systems?
The ability to discriminate individual phonemes, to hear words/sound differences, is defined as intelligibility, as distinguished from audibility, which is the ability to detect the presence of speech. If because of hearing loss, poor classroom acoustics, and/or poor attending skills, a child cannot discriminate wave from raise, for example, he or she will not learn appropriate semantic distinctions unless deliberate intervention occurs.
Carol Flexer in, FM AUDITORY TRAINING SYSTEMS. Characteristics, Selection, and Use. Ross, 1991,
Balancing FM systems. BATOD March '13

7. Why Use Personal FM Systems?
“The purpose of using technology is to promote the child’s right to hear and to benefit from educational instruction.”
Carol Flexer in, FM AUDITORY TRAINING SYSTEMS. Characteristics, Selection, and Use. Ross, 1991,
Balancing FM systems. BATOD March '13

8. Balancing FM systems. BATOD March '13

9. Balancing FM systems. BATOD March '13
Kimberly
Balancing FM systems. BATOD March '13

10. What is the purpose of balancing FM Systems?
To ensure that the level and quality of sound a child hears through the FM Systems microphone matches what he hears through the hearing instrument’s microphone.
Balancing FM systems. BATOD March '13

11. Balancing FM systems. BATOD March '13
Importance of Level
Too High
Serious risk of distortion
Danger of Compression
Too Low
Makes little difference to the child
Denied the right to access and benefit from instruction
Waste of resource
Disenchantment
Balancing FM systems. BATOD March '13

12. Balancing FM systems. BATOD March '13
Importance of Quality
Frequency response curves
Frequency response curves for Medel Opus 2 (curve 60 dB and with CA Digisystem 65 dB
Balancing FM systems. BATOD March '13

13. When Should Balancing be Done
At initial fitting
Change of hearing instrument
Change of FM system
Disturbance of controls
Balancing FM systems. BATOD March '13

14. Good Practice Fitting Procedure
Listening check of speech processor and FM system where possible, adjust settings.
An objective test-box method for setting up levels (see Quality Standards and Good Practice Guidelines)
Validate the settings with a speech test (eg McCormick) or
Validate the settings with a speech in noise test
As I mentioned previously we recommend the initial fitting takes place at the implant centre
We check the radio aid, set any internal switches, listen to it, then set it an appropriate volume for the user
The processor will be listened to if possible, and the appropriate map selected for the 3G with the monitor earphones not enabled.
The sequence for connecting the systems is to start with both the processor and FM systems switched off. The FM cable is connected, then the radio aid transmitter switched on, then the FM receiver and finally the speech processor.
Then we validate the Fm receiver setting by using the McCormick ATT, firstly without the radio aid, then with the radio aid. We would expect to show approximately a dB better result
We give an FM booklet which details the settings and instructions for the school, and two small summary cards detailing the user’s map programmes
Balancing FM systems. BATOD March '13

15. But, what if a child can’t do a speech test?
May have poor discrimination years after implantation
May not co-operate due to
tiredness
immaturity
language difficulties
behavioural difficulties
Balancing FM systems. BATOD March '13

16. Balancing FM systems. BATOD March '13
Callum
Balancing FM systems. BATOD March '13

17. Other Inputs Applied to FM Transmitters
Output from
Television.
CD player, other audio devices
Computer/Whiteboard
Soundfield device.
Balancing FM systems. BATOD March '13

18. Other Inputs Applied to FM Transmitters
Television, CD player, other audio devices, computer/ whiteboard. All should be used with caution – only on children who can report accurately. Soundfield systems . Used in the context of learning so must be balanced.
Balancing FM systems. BATOD March '13

19. Balancing Soundfield Systems
Obtain FR curve for hearing instrument
Obtain FR curve for FM system and adjust volume so curves match
Set FM transmitter to re-broadcast, place soundfield emitter in the test box – lid open.
Obtain frequency response curve and adjust output of soundfield system so curves match.
Balancing FM systems. BATOD March '13

20. Balancing FM systems. BATOD March '13
Demonstration
Re-broadcasting.avi
Balancing FM systems. BATOD March '13

21. Balancing FM systems. BATOD March '13
Any further enquiries to:
Balancing FM systems. BATOD March '13