WIMS Capstone Proposal DSP Demo

1
WIMS Capstone ProposalDSP Demo

• Abigail Fuentes Rivera
• Esteban Valentin Lugo
• Michael Ortiz Sanchez
• ICOM 5047
• Prof Nayda Santiago

2
Outline

• Amarillo-Esteban
• Verde Michael
• Rojo Abigail
• Introduction
• WIMS Background
• Work Done
• Purpose
• Goals
• WIMS DSP
• CIS Algorithm
• DSP Demo
• 8051 Microcontroller
• Plan of Work
• UART
• ADC
• SPI
• Time Schedule
• Team Members
• Facilities and Equipment

3
Introduction

• WIMS ERC
• Universities UMICH, MSU and MTU
• Formed the WIMS ERC
• Merge
• Micropower circuits
• Wireless interfaces
• Biomedical and environmental sensors.

4
Introduction (Cont.)

• Cochlear Implant
• Medical Devices that bypass damaged structures in
  the human ear.
• Stimulate directly the auditory nerve to allow
  deaf individuals to hear and interpret sounds.
• Allows simple insertion,
• Stimulates Auditory Nerve

5
Problem and Solution

• WIMS integrates DSP in its structure, providing
  low power consumption.
• The microcontroller board was found to have
  defects.
• We offer the WIMS developers a DSP emulator for
  further testing

6
Goals

• Implement an emulator for the WIMS Cochlear
  Implant DSP.
• Learn how to use and configure 8051
  Microcontroller.
• Use 8051 Microcontroller for the simulation.

7
WIMS DSP

• A DSP is a specialized microprocessor designed
  specifically for digital signal processing.
• WIMS DSP is a fully integrated, low power DSP
  core that performs the Continuous Interleaved
  Sampling also known as CIS algorithm. The main
  reason for using this kind of integration is the
  reduced power consumption and space requirements
  of the system.
• WIMS DSP receives data from the ADC, filters this
  signal, and processes it using values in the LUT,
  sending a calculated signal containing the
  amplitude and channel thru the SPI to the Hybrid
  Chip creating the stimuli to the electrodes
  implanted in the cochlea.

8
WIMS DSP Architecture
9
Continuous Interleaved Sampling CIS Algorithm

• Signals from microphone go thru a high pass
  filter, then thru n channels by n band pass
  filters, where n is the number of electrodes to
  be simulated.
• Each channel has envelope detection with low pass
  filter and rectifier.
• Signal is compressed reducing its dynamic range.
  
• Volume controlled by the patient.
• Output of each channel stimulate the electrodes.
• By stimulating one electrode at the time a better
  speech spectrum and speech understanding is
  achieved.

10
Continuos Interleaved Sampling CIS Algorithm
11
CIS Algorithm Formulas

• Equations used for the sound filtering.

12
8051 Microcontroller

• The 8051 has 128k for flash memory, which is more
  than WIMSs
• The 8051 has separate ADC.
• The 8051 microcontroller has low power
  consumption, just like the WIMS microcontroller.

13
WIMS DSP EMULATOR

• 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.

14
UART

• Create Interface between Lab VIEW and
  microcontroller through UART.
• Implement BUFFER to receive data from Lab VIEW,
  store in memory.

15
UART

• Universal Asynchronous Receiver/Transmitter
  Serial port of the 8051 Microcontroller.
• The 8051 does not have a serial output buffer.
• We need to be sure that a character is completely
  transmitted before transmitting the next
  character.

16
Analog to Digital Converter

• An analog signal will be received from the Data
  Acquisition Board, through the ADC. And converted
  to a digital Values
• The converted data along with the value data
  received through the UART will be converted using
  the CIS algorithm into a command word.
• Data will be sent to SPI.

17
Serial Peripheral Interface (SPI)

• SPI is a serial bus standard established by
  Motorola and supported in silicon products from
  various manufacturers.
• It is a synchronous serial data link that
  operates in full duplex, this means, signals
  carrying data go in both directions
  simultaneously.
• SPI is a standard for controlling almost any
  digital electronics that accepts a clocked serial
  stream of bits.

18
SPI

• The SPI will communicate our 8051 Micro with our
  Lab VIEW Interface.
• We will send data thru the SPI which will be used
  by the Hybrid Chip.
• To ensure the success of data transmission, an
  acknowledgement signal is received from the Lab
  VIEW interface.

19
Time Schedule
20
Team Members

• Engineering students
• Knowledge of microcontrollers, hardware, and
  software.

21
Facilities and Equipment
22
Risks
23
Budget
24
Acknowledgements

• Luis Calderon
• Nayda Santiago
• Debbie Ruperto

25
References

• Craig Steinger-Online 8051/8052 Microcontroller
  Tutorial Architecture, Assembly Language, and
  Hardware Interfacing.
• Progress Reports from last semester.
• A DSP Architecture for Cochlear Implants Eric D.
  Marsman
• 8051 Data sheets

26
Questions and/or Comments?