WIMS Capstone Proposal DSP Demo Abigail Fuentes Rivera Esteban Valentin Lugo Michael Ortiz Sanchez ICOM 5047 Prof Nayda Santiago

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 Risk Plans Budget Questions and/or comments

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

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

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

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

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.

WIMS DSP Architecture

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 it’s 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.

Continuos Interleaved Sampling CIS Algorithm

CIS Algorithm Formulas Equations used for the sound filtering.

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

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.

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

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.

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.

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.

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.

Time Schedule

Team Members Engineering students Knowledge of microcontrollers, hardware, and software.

Facilities and Equipment

Risks

Budget

Acknowledgements Luis Calderon Nayda Santiago Debbie Ruperto

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

Questions and/or Comments?