Tactile auditory sensory substitution
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Tactile Auditory Sensory Substitution. Ryan Thome, Sarah Offutt, Laura Bagley, Amy Weaver, Jack Page BME 200/300 October 20, 2006. Client: Veronica H. Heide, Au.D. Audible Difference Advisor: Mitchell E. Tyler, P.E., M.S. Dept. of Biomedical Engineering & Dept. of Ortho-Rehab Medicine

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Tactile Auditory Sensory Substitution

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Tactile auditory sensory substitution

Tactile Auditory Sensory Substitution

Ryan Thome, Sarah Offutt, Laura Bagley, Amy Weaver, Jack Page

BME 200/300

October 20, 2006


Tactile auditory sensory substitution

Client:

Veronica H. Heide, Au.D.

Audible Difference

Advisor:

Mitchell E. Tyler, P.E., M.S.

Dept. of Biomedical Engineering &

Dept. of Ortho-Rehab Medicine

University of Wisconsin - Madison


Overview

Overview

  • Problem Statement

  • Background

  • Proposed Designs

  • Future Work

  • Questions


Problem statement

Problem Statement

The goal is to design and develop an auditory substitution device that through the use of a digital hearing aid and either vibro- or electro-tactile stimulation can substitute for regional frequency hearing loss.


Pds summary

PDS Summary

  • Adjusts to user specific hearing loss

  • Works with digital hearing aid output

  • Use vibro- or electro- tactile stimulation

  • Not highly noticeable (discrete or aesthetically acceptable)


Sensory substitution

Sensory Substitution

  • Presenting environmental information absent in one sensory modality to another

  • Examples:

    • Long Cane - visual navigation substituted though touch

    • Sign Language - speech substitution through vision

    • Braille - visual text substitution though touch


High frequency hearing loss

High Frequency Hearing Loss

  • Sensorineural

  • Normal hearing = 50 – 20,000 Hz

  • Above 1,000 Hz is lost

  • Loss of ability to hear certain high frequency consonants

  • Like hitting piano key with no strings

Krames Communications.


Existing devices

Existing Devices

  • Tickle Talker

    • Electric shock on sides of fingers

    • One electrode per range of frequency

  • Tactaid 7

    • Vibro-tactile stimulation on sternum, abdomen, forearm or neck

  • Tacticon 1600

http://us.st11.yimg.com/us.st.yimg.com/I/audiologicalengineering_1903_431188


Digital hearing aid

Digital Hearing Aid

  • Two main types:

    In-the-ear (ITE)

    Behind-the-ear (BTE)

  • Frequency range 100 Hz – 7300 Hz

  • Takes analog waveform and converts it to string of numbers

  • Gain processing, digital feedback reduction, noise reduction, speech enhancement


Sound processing unit

Sound Processing Unit

  • Obtains high frequency signal from hearing aid

  • Amplifies signal

  • Several channels of frequency

  • Channel signals corresponding tactile stimulus to fire


Electro vs vibro tactile stimulation

Electro-

Pros

Less power consumption – 1.2mW per 3 mm electrode

Smaller

Easier construction

Cons

Potential for shock and burns (only @ v. large current)

Sensation quality varies

Limited dynamic range of sensation

Vibro-

Pros

Less variation in sensation

Comfort

Cons

More power consumption - 138 mW per 4 mm electrode

Harder to attach

More complex construction

Electro- vs. Vibro-Tactile Stimulation


Placement

Placement

  • In the ear

    • Pros

      • Completely concealed from outsiders

    • Cons

      • Less space for differentiation

      • More complex construction

  • Behind the ear

    • Pros

      • Mostly concealed from outsiders

      • Easy access to hearing aid

    • Cons

      • Attachment impeded by hair

  • Neck

    • Pros

      • Most space for tactile layout

      • Easiest construction

    • Cons

      • Easily noticeable to outsiders


Alternative design 1 2

Alternative Design 1 & 2

Design 1

Electro-Neck

Design 2

Vibro-BTE


Proposed design

Proposed Design

  • Electro-BTE

  • Array of electrodes aligned vertically behind ear

  • Each electrode corresponds to certain frequency range

  • As frequency increases each corresponding channel signals the electrode


Future work

Future Work

  • Decide on components

  • Design and build signal processing unit

  • Determine two point discrimination threshold

  • Analyze signal from hearing aid and break into channels


Design matrix

Design Matrix


References

References

  • Krames Communications. (1995). Hearing Aids. [Brochure]. San Bruno, CA.

  • Audiological Engineering Corp. (n.d.) Tactaid 7. Retrieved 29 September, 2006 from http://www.tactaid.com/tactaid71.html.


Questions

QUESTIONS


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