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 December 8, 2006

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Tactile Auditory Sensory Substitution. Ryan Thome, Sarah Offutt, Laura Bagley, Amy Weaver, Jack Page BME 200/300 December 8, 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 - PowerPoint PPT Presentation

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Page 1: Tactile Auditory Sensory Substitution

Tactile Auditory Sensory

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

BME 200/300December 8, 2006

Page 2: 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

Page 3: Tactile Auditory Sensory Substitution

AbstractHigh frequency hearing loss is a problem common among people of all age groups. People suffering from this type of hearing loss often lose the ability to hear certain consonant sounds, and as a result have difficulty communicating with others. The goal of the project is to use sensory substitution, a technique for presenting environmental information missing in one sensory modality to another, to help replace this missing high frequency information. The device takes recorded information, filters it into four different channels based on frequency, then outputs all four channels to a sound card. The sound card outputs to a circuit that amplifies the sound and reduces the noise. The circuit then outputs to four transducers. Use of this device, in conjunction with the lower frequency audio information gathered directly by the user, should allow the user to better communicate by speech and hearing.

Page 4: Tactile Auditory Sensory Substitution

Problem StatementThe goal is to design and develop an auditory substitution device that through the use of vibro-tactile stimulation can substitute for regional frequency hearing loss, in order to aid in daily communication needs.

Page 5: Tactile Auditory Sensory Substitution

Sensory Substitution Presenting environmental information absent in

one sensory modality to another

Examples: Long Cane - visual navigation substitution through touch Sign Language - speech substitution through vision Braille - visual text substitution through touch

Page 6: Tactile Auditory Sensory Substitution

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 1600http://us.st11.yimg.com/us.st.yimg.com/I/audiologicalengineering_1903_431188

Page 7: Tactile Auditory Sensory Substitution

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.

Page 8: Tactile Auditory Sensory Substitution

System Diagram

Amplified Analog VoltageSignal

Analog Voltage Signal Digital Signal

that has been filtered to specified frequency, amplitude, and channel divisions

Analog Voltage Signal

Microphone

Cool Edit

Person Speaking

Sound CardMulti-channelAmplifier

Transducers User

Audio Waves

Vibrational Pulses

Digital Signal

Page 9: Tactile Auditory Sensory Substitution

“Cool Edit” Software

Audio input is filtered for specific frequency range Becomes separate channels

1: 1.6-2.0 kHz – p, i, m 2: 2.0-3.0 kHz – ch, sh 3: 3.0-3.5 kHz – f 4: 4.5-8.0 kHz – s, th

Page 10: Tactile Auditory Sensory Substitution

Sound Card Turtle Beach Audio

Advantage Roadie Able to output up to

six channels Voltage output 0-60

mV

Page 11: Tactile Auditory Sensory Substitution

Circuit Parts

Four comparators Four transducers 10kΩ and 1kΩ Resistors

Amplifies signal Reduces noise Initial voltage output

0-50mV Amplified 11x Current draw

0-2mA

Page 12: Tactile Auditory Sensory Substitution

Output Piezoelectric

buzzers Placed on neck

with Bioflex® adhesive

Transducers buzz if amplitude in that channel exceeds a voltage of 1 V

Page 13: Tactile Auditory Sensory Substitution

Word Discrimination Joe took father’s shoe bench out he was

sitting on my lawn.

Pairs of words that can be distinguished with device Sixty versus Fifty Shirt versus Church Much versus Such Sob versus Shop

Page 14: Tactile Auditory Sensory Substitution

Word PairsSixty - Fifty Much - Such

Page 15: Tactile Auditory Sensory Substitution

Future Work Acquire and implement vibro-stimulators Minimize size Real time Specific sound analysis

Page 16: Tactile Auditory Sensory Substitution

References Audiological Engineering Corp. (n.d.) Tactaid 7. Retrieved 29 September, 2006 from

http://www.tactaid.com/tactaid71.html.

Better Hearing Institute (BHI). Hearing Loss- The Prevalence of Hearing Loss. 2005-2006. Date Vistied: 10/13/2006. http://www.betterhearing.org/hearing_loss/prevalence.cfm

Fairbanks, G. Voice and Articulation Drill Book. Harper & Row Publishers; New York, 1960. Pages 88-104.

Kaczmarek, K. A., Webster, J. G., Bach-y-Rita, P. and Tompkins, W. J. Electrotactile and vibrotactile displays for sensory substitution systems 1991.

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

“Piezoelectric Transducers.” NDT Resource Center. 19 October 2006 http://ed.org/EducationResources/CommunityCollege/Ultrasonics/EquipmentTrans/piezotransducers.htm.

Scapa. (2006). Bioflex. Retrieved 31 November, 2006, from http://www.scapana.com/productdetail.jsp?productid=3637&search=products

Webster, John G. (2003). Bioinstrumentation. Indianapolis, IN: John Wiley & Sons Inc.