What if cross-hearing is a problem? Necessary to prevent NTE from responding. Necessary to prevent NTE from responding. Procedure: MASKING. Procedure:

Slides:

Advertisements

Similar presentations

© 2010 Pearson Education, Inc. Conceptual Physics 11 th Edition Chapter 21: MUSICAL SOUNDS.

Advertisements

SPA 4302 Summer 2006 Nonorganic Hearing Loss. Some Terminology PseudohypacusisPseudohypacusis – False hearing loss FunctionalFunctional – Loss with no.

Pure Tone Audiometry Training Course ——Marketing Dept.

Indications of non-organic hearing loss

Occupational Audiometric Testing Part 1: Purposes and Procedures Thomas W. Rimmer, ScD, CIH Fay W. Boozman College of Public Health University of Arkansas.

Thresholds, Recognition Tests, MCL &UCL

An Update on Hearing Aid Testing

Pure Tone Audiometry Basic Principles of Sound The Audiometer

Masking: Insuring that the non-test cochlea is not helping out. Making sure that the ear you want to test is the one that is responding.

1 Auditory Sensitivity, Masking and Binaural Hearing.

Chapter 6: Masking. Masking Masking: a process in which the threshold of one sound (signal) is raised by the presentation of another sound (masker). Masking.

A.Diederich– International University Bremen – Sensation and Perception – Fall Frequency Analysis in the Cochlea and Auditory Nerve cont'd The Perception.

Hearing Detection Loudness Localization Scene Analysis Music Speech.

Reading Assignment! We’ll discuss the chapter by Gregory in your book on Friday of next week.

1 Hearing Sound is created by vibrations from a source and is transmitted through a media (such as the atmosphere) to the ear. Sound has two main attributes:

Two- tone unmasking and suppression in a forward-masking situation Robert V. Shannon 1976 Spring 2009 HST.723 Theme 1: Psychophysics.

Spectral centroid 6 harmonics: f0 = 100Hz E.g. 1: Amplitudes: 6; 5.75; 4; 3.2; 2; 1 [(100*6)+(200*5.75)+(300*4)+(400*3.2)+(500*2 )+(600*1)] / = 265.6Hz.

Hearing Detection Loudness Localization Scene Analysis Music Speech.

ANSI Overview Hearing Aid Testing and Verification What is ANSI?

TOPIC 4 BEHAVIORAL ASSESSMENT MEASURES. The Audiometer Types Clinical Screening.

PURE TONE AUDIOMETRY BALASUBRAMANIAN THIAGARAJAN DRTBALU'S OTOLARYNGOLOGY ONLINE.

Lecture 12 10/03/2015  The child is conditioned to wait for a frequency specific stimuli in the sound field and respond using a play activity  used.

© 2010 Pearson Education, Inc. Conceptual Physics 11 th Edition Chapter 21: MUSICAL SOUNDS Noise and Music Musical Sounds Pitch Sound Intensity and Loudness.

Fundamentals of Perceptual Audio Encoding Craig Lewiston HST.723 Lab II 3/23/06.

Measurement of Hearing and Audiogram Interpretation

HISTORY OF HEARING TESTING. Audiology Audio - Latin…to hear, pertaining to hearing Logy - Greek…logus…science Therefore the science of hearing and hearing.

Summer 2007 SPA 4302 Pure Tone Audiometry.

Dynamic Range and Dynamic Range Processors

Test of Hearing And Pure tone Audiometry

Bastaninejad, Shahin, MD, ORL-HNS

Pure Tone Audiometry SPA 4302 Summer A, The Pure-Tone Audiometer Electronic device that generates tones for determining hearing thresholds Manufactured.

Test of Hearing And Pure-tone Audiometry

Speech Audiometry SPA 4302 Summer A, The Diagnostic Audiometer Equipped with Inputs for microphones, cassette tapes, or CDs Volume unit (VU) meters.

Pure Tone Audiometry most commonly used test for evaluating auditory sensitivity delivered primarily through air conduction and bone conduction displayed.

Applied Psychoacoustics Lecture 3: Masking Jonas Braasch.

Hearing Research Center

Hearing Lab Tests. Rinne Test rinne.htm rinne.htm

Human Capabilities Part – I. Hearing (Chapter 6*) Prepared by: Ahmed M. El-Sherbeeny, PhD 1.

How your age affects your Hearing. Background I picked this project because I was interested in the mosquito ring tone. The mosquito ring tone is a cell.

MASKING BASIC PRINCIPLES CLINICAL APPROACHES. Masking = Preventing Crossover Given enough intensity any transducer can stimulate the opposite cochlea.

Speech Audiometry SPA 4302 Summer The Diagnostic Audiometer Equipped with Inputs for microphones, cassette tapes, or CDs Volume unit (VU) meters.

Tools for optimizing the installation of warning sounds in noisy workplaces Chantal Laroche, Christian Giguère, Rida Al Osman and Yun Zheng 2010 NHCA Conference.

Normal hearing Conductive HL Sensorineural HL Mixed HL Outer earMiddle earInner earAuditory nerveOuter earMiddle earInner earAuditory nerveOuter earMiddle.

1 Hearing Sound is created by vibrations from a source and is transmitted through a media (such as the atmosphere) to the ear. Sound has two main attributes:

What do we hear? Sound is a compression wave - it only “looks” like a wave if we plot air pressure against time time -> Air Pressure Period - amount of.

AUDIOMETRY An Audiometer is a machine, which is used to determine the hearing loss in an individual.

Figures for Chapter 8 Candidacy Dillon (2001) Hearing Aids.

PSYC Auditory Science Spatial Hearing Chris Plack.

Fletcher’s band-widening experiment (1940)

Sound. Sound Intensity Intensity – the rate of energy flow through a given area.

Fletcher’s band-widening experiment (1940) Present a pure tone in the presence of a broadband noise. Present a pure tone in the presence of a broadband.

Test procedure Several different methods followed. Several different methods followed. Most standard: Recommended by Carhart and Jerger (1959) and ASHA.

Date of download: 6/29/2016 Copyright © 2016 SPIE. All rights reserved. (a)–(d) shows the access to the cochlea and placement of the optical fiber. The.

Sound Localization and Binaural Hearing

Speech Audiometry Lecture 8.

Chantal Laroche, Christian Giguère, Rida Al Osman and Yun Zheng

Fletcher’s band-widening experiment (1940)

PSYCHOACOUSTICS A branch of psychophysics

Precedence-based speech segregation in a virtual auditory environment

A. B. C. < × >.

بنده پیر خراباتم که لطفش دایم است

Masking for SRT Crosshearing suspected when SRTTE – IA ≥ Best BCNTE

What if cross-hearing is a problem?

CHAPTER 10 Auditory Sensitivity.

Masking for BC Initial masker level for BC = ACNTE + OE , where OE is the occlusion effect Use of insert earphones: Smaller occlusion effect, greater IA.

HEARING ASSESSMENT: PURE TONE AUDIOMETRY

X y y = x2 - 3x Solutions of y = x2 - 3x y x –1 5 –2 –3 6 y = x2-3x.

Inter-aural attenuation

Bone conduction audiometry

Presentation transcript:

What if cross-hearing is a problem? Necessary to prevent NTE from responding. Necessary to prevent NTE from responding. Procedure: MASKING. Procedure: MASKING. Types of masking: Central versus peripheral Types of masking: Central versus peripheral Central masking: Elevation of threshold of a pure tone presented to one ear when noise is presented to the other ear. Around 5 dB threshold shift. Central masking: Elevation of threshold of a pure tone presented to one ear when noise is presented to the other ear. Around 5 dB threshold shift. What types of maskers? Noise (white versus narrow). What types of maskers? Noise (white versus narrow).

Effective masking (EM) Amount of threshold shift provided by a certain amount of noise. Amount of threshold shift provided by a certain amount of noise. 20 dB EM is the amount of noise just enough to make a 20 dB HL 1000 Hz tone inaudible. 20 dB EM is the amount of noise just enough to make a 20 dB HL 1000 Hz tone inaudible. A 25 dB HL tone would be audible in the presence of 20 dB EM noise. A 25 dB HL tone would be audible in the presence of 20 dB EM noise.

Methods for masking ‘Shotgun’ method ‘Shotgun’ method Minimum noise method: Use effective masking level in the non-test ear. Just enough noise to shift AC and BC thresholds in the non-test ear by 5 dB. Minimum noise method: Use effective masking level in the non-test ear. Just enough noise to shift AC and BC thresholds in the non-test ear by 5 dB. Maximum masking: BC TE + IA – 5 Maximum masking: BC TE + IA – 5 Danger of overmasking, where masking level exceeds BC TE + IA – 5 Danger of overmasking, where masking level exceeds BC TE + IA – 5

Hood’s plateau method Measure unmasked threshold in test ear. Measure unmasked threshold in test ear. Present noise to non-test ear, starting at effective masking level. Present noise to non-test ear, starting at effective masking level. Present tone. Test-ear threshold will probably go up. WHY? Present tone. Test-ear threshold will probably go up. WHY? If the tone is heard, then increase masking noise level in 5 dB steps till tone is not heard. If the tone is heard, then increase masking noise level in 5 dB steps till tone is not heard. If the tone is not heard, then increase tone level till it becomes audible again. If the tone is not heard, then increase tone level till it becomes audible again. At some point, tone will be heard even after masking noise level has increased several steps: PLATEAU At some point, tone will be heard even after masking noise level has increased several steps: PLATEAU This is the masked threshold of the test ear. This is the masked threshold of the test ear.

Sufficient masking Overmasking Undermasking Minimum maskingMaximum masking