Aided Soundfield Testing - University of Manchester
Sound Field Testing MCHAS TEAM Wave 4 SFR 17/05/04 Modernising Childrens Hearing Aid Services What can aided sound field thresholds tell us? Modernising Childrens Hearing Aid Services Aided Thresholds 10 0 10 20 A 30 40
A A A 50 A 60 70 80 90 100 110 120 130 140 125
250 500 1000 2000 Frequency (Hz) 4000 8000 Modernising Childrens Hearing Aid Services Limitations Relies on valid behavioural response Modernising Childrens Hearing Aid Services Limitations Hearing Threshold
Limited frequency resolution 10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 A A .125
.25 .5 A A 1 24 Frequency (Hz) 8 Modernising Childrens Hearing Aid Services Limitations dB SPL (TM) No information on real ear output characteristics HA 140 130 120 110
100 90 80 70 60 50 40 30 20 10 0 -10 X X A 125 250 500 X
A X A 1000 X A 2000 4000 X 8000 Frequency (Hz) Modernising Childrens Hearing Aid Services Limitations Poor test-retest reliability
10 0 10 20 30 40 50 AA A A 60 70 A A A A A A
80 90 100 110 120 130 140 125 250 500 1000 2000 4000 Frequency (Hz) 8000 Need at least 15 dB difference between conditions before significant effect
(Hawkins 1985). Modernising Childrens Hearing Aid Services Limitations Provide little indication of speech audibility, especially when using WDRC. Seewald 2003 Modernising Childrens Hearing Aid Services Limitations Inaccurate in regions of normal hearing 10 0 10 20 30 40 50 60 70 80
90 100 110 120 130 140 X A X A A X 125 250 A X
A A X 500 1000 2000 4000 Frequency (Hz) X 8000 Modernising Childrens Hearing Aid Services So what information is provided? An indication of the childs/infants auditory performance
Good visual/auditory demonstration to parents between no hearing aids vs hearing aids. Modernising Childrens Hearing Aid Services A word of caution Be aware of possible interactions with hearing aid features. Number of channels Compression speed Noise algorithms Active feedback control Modernising Childrens Hearing Aid Services What the Aided Threshold is and is not IS: -index to reflect softest perceptible sound w/o vc -Functional gain reflects gain for softest sound (not conversational level) IS NOT: -Reflect gain for any input level other than soft -Reflect gain for conversational sounds
-Reflect loudness comfort -Reflect processing of DSP aids eg. NR etc Kuk, F (AAA 2004) Modernising Childrens Hearing Aid Services What Real-Ear Measure is and is not IS:-Allows determination of physical output of hearing aid at different input levels: *Gain for conversational, soft and loud sounds *Effect of signal processing eg.compression, NR etc IS NOT:-A perceptual response ie. Does not tell how soft a child can hear -cannot predict aided threshold Kuk, F (AAA 2004) Modernising Childrens Hearing Aid Services So, should we be using both for a fuller picture? Perhaps
If so, what should be the optimal aided threshold? Depends on criteria: *Importance of hearing soft or low level input sounds and meaningfulness of these *Degree of hearing loss and possible dead regions *Limitations of hearing aid (as discussed) Modernising Childrens Hearing Aid Services THANK-YOU! Modernising Childrens Hearing Aid Services
This innate knowledge is often referred to as universal grammar. Generative grammar The Chomskyan approach towards syntax is often termed generative grammar Chomskyan syntactic analyses are often highly abstract, and are based heavily on careful investigation of the border between...
While non-baryonic matter does exist, it is not commonly encountered in normal life. What about anti-baryons? There are also anti-baryons which comprise anti-matter. Anti-particles are like their normal particle counterparts, but with opposite charge.
Interface with local marine dealers and other Partners who have an interest in conspicuously supporting RBS by allowing the free distribution of RBS pamphlets and brochures in their place of business. ADDITIONAL SERVICES. Serves our customers (District VE and PV...
Head of Housing and Planning Services SC 580 Head of Strategy and Communications ... Admin Finance Officer F705T Property Admin Assistant F552 Admin Finance Supervisor F129 Health and Safety Advisor (MHDC) F910 Development Surveyor * * ...
Heavenly Kingdom and City. Rebellion. Obedience. Blasphemy. Worship. Bitumen Bricks. Living Stones. False Worship. True Worship. To glorify man. To glorify God. To make man a name. To exalt the name of the Lord. Trying to Band Together. Waiting to...
AASB 2014 - 10 Sale or Contribution of Assets between an Investor and its Associate or Joint Venture. AASB 2016-5 Classification and Measurement of SBP transactions. AASB 2017-1 Amendments to Australian Accounting Standards - Transfers of Investment Property, Annual Improvements...
Hampden County Minnesota . Beltrami County ... and maintaining programs of interagency cooperation and coordination among the court and various public agencies that serve at-risk children, victims, and families. The NCJFCJ has been leading the way in changing working relationships,...
Ready to download the document? Go ahead and hit continue!