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Universidad de La Laguna
EVALUATION OF THE BENEFITS EVALUATION OF THE BENEFITS OF FM SYSTEMS IN COCHLEAR OF FM SYSTEMS IN COCHLEAR IMPLANTS AND HEARING AID IMPLANTS AND HEARING AID
USERSUSERSBarajas , J.J. (3), Mora, R. (2), Fernández, R. (1), De Lucas, G. (1)
Zenker, F. (1)
(1) Clínica Barajas (2) Fundación Canaria Dr. Barajas para la Prevención e Investigación de la Sordera (3) Universidad de la Laguna
SANTA CRUZ DE TENERIFE - CANARY ISLANDS - SPAINSANTA CRUZ DE TENERIFE - CANARY ISLANDS - SPAIN
Gobierno de CanariasConsejería de Educación,
Cultura y Deportes
1 st Conference EHDI August 13-14 Johannesburg - South Africa
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CLASSROOM ACOUSTICSCLASSROOM ACOUSTICS– Background Noise (BN).– Reverberation Time (RT).– Speech Audibility Index (SAI).
FREQUENCY MODULATED SYSTEMSFREQUENCY MODULATED SYSTEMS – Selection of Candidates– FM Fitting and Verification
CANARIAS FM PROJECTCANARIAS FM PROJECTGobierno de CanariasConsejería de Educación,
Cultura y Deportes
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AVERAGE CLASSROOM AVERAGE CLASSROOM (N=24)(N=24)
WIDTH: 6,31 mLENGTH: 9,78 mHEIGHT: 3,03 m
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MEAN REVERBERATION TIME MEAN REVERBERATION TIME (N=24)(N=24)
UNE en ISO 3382 (2001) “Acoustic measurements of the reverberation time of rooms with referent to other. Acoustical parameters” (1997)
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MEAN BACKGROUND NOISEMEAN BACKGROUND NOISE (N=24) (N=24)
Noise Rating Curves (NRC) - ISO
NOISE RATING CURVES (NRC)
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CLASSROOMS ACOUSTIC CLASSROOMS ACOUSTIC N=24N=24SPEECH AUDIBILITY INDEX (SAI): SPEECH AUDIBILITY INDEX (SAI):
52%52%PSR = 90 %
% P
redi
cted
Spe
ech
Rec
ogni
tion
(PS
R)
% Speech Audibility Index (SAI)
Nor
mal
Hea
ring
Hearing Im
paired
PSR = 48 %
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FM SYSTEMFM SYSTEM TRANSMITTER RECEIVER
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SUBJECTS(n = 23)
RANGE OF AGE: 5 – 14 YEARS
UNILATERAL COCHLEAR IMPLANT
(n = 7)
HEARING AID
(n = 9)
BILATERAL
(n = 7)
UNILATERAL
(n = 2)
n=16
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Speech Discrimination TestSpeech Discrimination Test
LEXICAL FREQUENCY LEXICAL FREQUENCY
(% of correct phonemes recognition)
High Frequency WordsExamples:
Vaca- casapeluche- cepillo
Low Frequency WordsExamples:
Bufón- bizón, flácida- tímpano
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PROCEDUREPROCEDURESpeech Discrimination TestSpeech Discrimination Test
☺☺NOISENOISE
☺☺QUIETQUIET
WITH FMWITH FMWITHOUT WITHOUT FMFM
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TEST CONDITIONTEST CONDITION
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FREQUENTLY WORDSFREQUENTLY WORDSWITH FM AND BACKGROUND NOISE WITH FM AND BACKGROUND NOISE
CLASSROOM CLASSROOM ACOUSTICACOUSTIC
BNICRA = 65 dBA
RT60 = 1,28 mseg
SNR = 7 dB
SAI = 52%
HEARING HEARING CORRECTIONCORRECTION
FM = Phonak Campus + Micro Link
HA= Phonak Supero 412
☺
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INFREQUENTLY WORDSINFREQUENTLY WORDSWITHOUT FM AND BACKGROUND NOISEWITHOUT FM AND BACKGROUND NOISE
CLASSROOM CLASSROOM ACOUSTICACOUSTIC
BNICRA = 65 dBA
RT60 = 1,28 mseg
SNR = 7 dB
SAI = 52%
HEARING HEARING CORRECTIONCORRECTION
FM = Phonak Campus + Micro Link
HA= Phonak Supero 412
☺
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RESULTSRESULTS
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BOX PLOT OF % PHONEMES RECOGNITIONBOX PLOT OF % PHONEMES RECOGNITION
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MAIN EFFECTSMAIN EFFECTS
HEARING CORRECTION FM
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LEXICAL FREQUENCY BACKGROUND NOISE
MAIN EFFECTSMAIN EFFECTS
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INTERACTIONSINTERACTIONS
FM X LEXICAL FREQUENCYFM X BACKGROUND NOISE
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FM BENEFITFM BENEFIT Dot Diagram
WITH FM
WITHOUT FM
% S
CO
RE
PH
ON
EM
ES
RE
CO
GN
ITIO
N> 85 % > 85 %
Sens: 62,5Sens: 62,5
Spec: 60,3Spec: 60,3
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FM BENEFIT: WORDSFM BENEFIT: WORDSReceiving Operation Curves (ROC)
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CONCLUSIONSCONCLUSIONS
The lexical infrequent words in noise conditions subtest may be use as a selection criteria for establish FM candidates