wireless integrated microsystems cochlear team team members feliut guzman wilmarie rios luis...
TRANSCRIPT
Team Members
Feliut Guzman Wilmarie Rios Luis Calderon Guillermo Martinez Michael Ortiz Esteban Valentin Abigail Fuentes Debbie Ruperto Axel Claudio
Outline
Introduction Cochlear Implants WIMS Cochlear Implant UPRM Work Demos Final Results Acknowledgements Questions
Introduction
WIMS - Wireless Integrated MicroSystems– Engineering Research Center
National Science Foundation (NSF) Core Institutions
University of Michigan, Ann Arbor – leading institution Michigan State University Michigan Technological University
Collaborating Institutions University of Puerto Rico, Mayagüez Campus Praire View University Tulane University Howard University University of Utah
Introduction
Merge– Micropower circuits– Wireless interfaces– Biomedical and environmental sensors and
subsystems Create microsystems with persuasive impact on
society for next two decades– WIMS Cochlear Implant
Cochlear Implants
Medical devices that bypass damaged structures in the inner ear
Stimulate directly auditory nerve to allow deaf individuals to learn to hear and interpret sounds and speech
For patients who have an injury at the cilium level in the cochlea
Cochlear Implants
Electrodes formed from a bundle of wires – Fed into the snail-shaped cochlea of the inner ear
Different auditory nerve fibers are stimulated at different places in the cochlea
Different electrodes are stimulated depending on the frequency of the signal
WIMS Cochlear Implant
WIMS– Development of cochlear implant based on thin-film electrodes
Direct stimulation of the auditory nerve Cochlear Implant design
– Allow a simpler insertion for surgeons – Minimize damage to healthy ear tissue
Current implants– Anywhere from 16 to 22 stimulating sites along its length
WIMS implant– Expected host up to 128 stimulating sites
UPRM Work
University of Puerto Rico at Mayagüez– Development of software for the microcontroller developed
by WIMS
WIMS Board is under development
Testing Methods– Demos
Tone Demo DSP Demo
UPRM Work
WIMS Board is still under development. Code needs to be tested. We will demonstrate the functionality of the
implant using two demonstrations – Tone Demo
Demonstrate input and output of the system
– DSP Demo Demonstrate processing in the system
Demos: Tone Demo
Arr
ay
Tra
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Arr
ay
Ele
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16-bits(ampl & address)M
icro
cont
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8-bits(ampl &
freq)Te
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hip
Pro
cess
or
RF
Goal– Show site addressing and current amplitude by
driving the appropriate LEDs represented on a graphical interface
Demos: Tone Demo
WIMS board emulated in SiLabs 8051 board– Modules
Telemetry Chip Tone Demo C Code
LabVIEW Intefaces– Piano Demo– LED Array
Hybrid Chip Simulation
Demos: Tone DemoLabVIEW Interface I – Piano Demo
Sends Amplitude and Frequency– Command Words– Sound generation
Individual KeysClose Encounter
Buttons LED Array Output
Control
Demos: Tone DemoLabVIEW Interface: Led Array
Get Processed Data
Simulate Hybrid Chip
Shows a representation of the electrode stimuli
Display biphasic signal
Demos: DSP Demo
DSP – Specialized microprocessor designed for Signal
processing algorithms Reduced power consumption and space
requirements of the system WIMS DSP
– Fully integrated, low power DSP core– Performs Continuous Interleaved Sampling
(CIS algorithm)
Demos: DSP Demo
Functionality– The WIMS DSP receives data from the chip’s
analog to digital converter– Signal is compressed reducing it’s dynamic range – Sends the processed signal to the hybrid chip – Stimulates Electrodes.– By stimulating one electrode at the time
Allows better speech spectrum and speech understanding
Demos: DSP Demo
• CIS Algorithm Block Diagram
• Implemented in hardware in the DSP
of the WIMS Microcontroller
Demos: DSP Demo
Goal– Implementation of an emulator for digital signal
processor of the WIMS microcontroller
System Behavior– Signals from LabVIEW interface sent throught
ADC– Data Processed by emulator – Processed Data is sent to LED Array interface
•DSP must be initialized
•ADC receives analog input.
•16-bit command word generated .
•Command word sent to Hybrid Chip Lab VIEW interface to simulate electrode stimulation.
Demos: DSP Demo
Demos: DSP Demo
Process– Receive data from the ADC– Filters this signal – Process using the CIS algorithm – Send a calculated signal containing the
amplitude and channel thru the SPI– Signal goes to the Hybrid Chip
Creation of stimuli for the electrodes inside the cochlea
LabVIEW Interface I: DSP Demo
Description – The interface named values.vi is used to send the coefficients values to the MCU.
Coefficients – values that are used to initialize the DSP.
LabVIEW Interface I: DSP Demo
Tasks– Send coefficients values to MCU’s USART
through the Data Acquisition Board. Data to be sent in the same format used in the WIMS
Telemetry Chip.
– Synchronize the interface with the microcontroller's USART
Guarantee data is being transmitted and received correctly.
– Test interface functionality
LabVIEW Interface II: DSP Demo
Works in conjunction with Matlab
Out.wav File Datastream.txt File If Analyzed the data
is displayed. Data can also be
plotted on the interface.
Goal– Work with DAQ
and ADC– Communicate with
MCU
Final Results
Bidirectional Communication– PC generates data– MCU process the data– PC displays output
Data Recovery Among Interfaces
Acknowledgements
Nayda Santiago, Ph. D. David Ortiz, M.S. Student UPRM Jamie Hetke, System Integrator Eric Marsman, Ph.D. Student UMich Amir Sodagar, Ph. D. Ken Wise, Ph. D.
References
Craig Steinger-Online 8051/8052 Microcontroller Tutorial: Architecture, Assembly Language, and Hardware Interfacing
Eric D. Marsman, A DSP Architecture for Cochlear Implants;
8051 Data sheets