sonosense technologies inc. handheld spectrum analyzer sanaz jahanbakhsh (ceo) johnny pak (coo)...

SonoSense Technologies Inc.

Handheld Spectrum Analyzer

Sanaz Jahanbakhsh (CEO)Johnny Pak (COO)

Naureen Sikder (Head of R&D)Kenneth Wong (CFO)

April 25, 2007 Copyright SonoSense Technologies Inc. 2007 2

Outline of Presentation• Introduction• Business Aspects and Prospects• Hardware Components• Software Components• Project Dynamics• Future Plans• Conclusion

Product Overview

“It Rocks!”

System Description

• Handheld Spectrum Analyzer (HSA)

• Standalone Surveying Device

• Processes audible sound waves

• Displays frequency spectrum on LCD

• “Real Time” Updates

System Modules

System Overview

Sound Wave Input

Analog-Digital Converter

Processing Unit

Display Results

Reasons for Implementation• Great Capstone Project

-Courses Used

-Circuit Design Skills

-Programming Skills

-Application of Theory

Business

“Why would we want to buy this?”

Frequency Spectrum Analysis• Purpose

– Measuring Sound Levels– Calibrating instruments

• Specialized market– Musicians and Performers– Event Coordinators– Sound Technicians– Consumer Hobbyists

Business Potentials• Competition

– High Frequency– Low Frequency– Add-on Frequency

• Final Distribution Channel– Direct Online Sales

• Cost Reduction– Brick and mortar associated costs– End distributor costs

Hardware Components

“Did you turn it off and on again?”

Hardware DesignSound Wave Input

Amplifier

Select Input

Switch

Microphone

Analog-Digital Converter

Line-In

Amplifier

Microphone Circuit• Panasonic Electret Microphone (20hz-

20khz range)– Relatively Cheap– Acceptable Response Bandwidth– Easy to Use

• Non-inverting Amplifier (gain of 22)

Line-in Circuit• Universal Standard output from electronic

audio devices

• Jack voltage output of -1V to 1V

• Non-inverting Amplifier (gain 2.5V)

Analog to Digital Converter Circuit• Analog Devices AD974 ADC

– Fast Sampling Rate (200ksps)

– 16 Bit Precision

– DIP Packaging

– SPI interface

– Free

Serial Peripheral Interface Connections

Voltage from amplifier

SerialClock

SerialData

Read/ConversionClock

Slave Select

MC9328MX1Development

SPI Interface

MC9328MX1 Development Board

• ARM920T 200Mhz Processor

• QVGA Display

• SPI Expansion Port

• USB / Serial Connections

• Obtained from Lucky

Software Components

“Why does Microsoft do this?!”

Operating System Choices• No Operating System (MetroTRK)

– Assembly Language– Difficulty in displaying graphics

• Linux– Open Source SPI Driver Code– Difficulty obtaining development tools– Lack of experience

• Windows– Existing Libraries for GUI Development– Driver Development Functions– Ease of Code Transfer onto MX1

Integrated Development Environments

• IDE to create custom Operating System (Platform Builder)

• IDE to create application on Windows CE 4.2 .Net (Embedded Visual C++)

Application Algorithm

Sample Data From Driver

Process Data (FFT Algorithm)

Average Values

Display Results

Initialize Display Window

Continuous or SnapShot Mode?

Continuous

Sample Data From Driver

Process Data (FFT Algorithm)

Display Results

Stop Data Collection

User Input (Menu Item Selection)

Snapshot Mode

Stop is Pressed?

Stop Data Collection

OS and Driver Accessing

OperatingSystemLevel

DriverSPI Input

ApplicationLevel

Reading from Driver

Request

Driver

• Stream Driver– Simplicity (reading only)– Easy Interface with application– Direct access to hardware– Meant for streaming data processes

• Application access of driver– Createfile, Openfile, ReadFile, CloseFile

GUI• Main processes constantly checking for

messages running

• Custom Message handling– WM_PAINT– WM_TIMER

• Displaying new bars requires update of display

Sound Processing

Perform FFT

Calculate Power

Average Power Values

Fill Circular Buffer

Digitized Sound Data Array

Time Average of Power Bar Results

Fourier Transform• Decomposition into

Sinusoidal Components for Different Frequencies– X(k) = Frequency

Coefficient– x(n) = Time data– N = Total Input Points

2cos)(

2sin)()(

2sin)(

2cos)()(

10,)()(

knnxkX

WWpropertyyPeriodicit

WWpropertySymmetry

eWwhere

NkWnxkX

Fast Fourier Transform (FFT)• Algorithm

– Radix-2 (butterfly)

• Options– FFTW, Frequency Analyzers

• Limitation – No Floating Point Unit

• Solution– User integers in lieu of double or floats

Integer FFT• Outdated (written in 1989)

• Uses Short Integers (16 bits)

• Lookup Tables for Sine Values

• Calculates power from fft without using square roots

• Look Up table for Power in dB

SonoSense’s FFT• 1024 points algorithm

• Sampling Rate: 32 kHz

• Frequency Range: 0 Hz – 16 kHz

• Power Measurements in Decibel

• 20ms to Calculate Final power

Frequency Averaging• 512 Frequency Bins• Average Frequency Range for Each Bar• Frequency Distribution over the x-axis:

Bars 1-5 Bars 6-100 - 31.25 500 – 100031.25 – 62.5 1000 – 200062.5 – 125 2000 – 4000 125 – 250 4000 – 8000250 – 500 8000 – 16000

Time Averaging• Circular Buffer

• Disposal of Old Results

• Average of Last 8 Results– Smoother Display

Display• Change of Rectangle Heights Based on

Power Level

• Maximum Power Indicator

• Refresh Rate of 100ms

Project Issues

“Why did you do that?!”

Group Dynamics• Group Dynamics Issues

– Scheduling– Miscommunication

• No Group issues– In the Past Month– Together Everyday for the Past Month

• cohesive bond

Proposed vs. Actual BudgetModule Income

(Cdn)Proposed Costs

(Cdn)Actual Costs (Cdn)

ESSEF Fund $115

Input Module(microphone circuitry, line-in circuitry, switch circuitry)

$25 $30.22

ADC Module ( Interfacing Circuitry, Analog to Digital Conversion Circuitry)

$55 $62.00

Software Development Cost $40 $0

Processing Unit (ARM processor ( $20 per unit [7], onboard chip requirements (RAM/ROM))

$50 $0

Display Unit (LCD display[8]) $120 $0

Memory Unit ( SD Card) $30 $0

Power Module (Battery Requirement) $15 $0

Packaging $20 $4.52

Total $115 $355 $96.76

Difference between proposed / actual costs $258.24

Actual Under-Budget Amount $18.24

Actual Product CostModule Estimated Cost (Cdn)

Input Module(microphone circuitry, line-in circuitry, switch circuitry) $8.66

ADC Module ( Interfacing Circuitry, Analog to Digital Conversion Circuitry) $12.52

Software Development Cost $0

Processing Unit (ARM processor ( $20 per unit [7], onboard chip requirements(RAM/ROM))

Display Unit (LCD display[8]) $0

Memory Unit ( SD Card) $0

Power Module (Battery Requirement) $0

Packaging $4.52

Sub-Total $25.70

Proposed Timeline

Actual Timeline

5/3/20071/19/2007

1/22/2007Proposal

2/19/2007Functional Specs

3/5/2007Design Specs

4/23/2007Software Implementation

4/24/2007Hardware Implementation

3/5/2007Design Specifications and Research

4/24/2007Integration and Testing

4/25/2007Demo Preparation

5/2/2007Post Mortem Completion

Internal Factors• Time Consuming OS Builds and Flashing Time• Longer Learning Curve

– Platform Builder– Embedded Visual C++

• Lack of Experience with Embedded Development

• Not knowing that ARM was lacking FPU Unit• Inefficient Time Management

External Factors• Delay in Obtaining BSP Image• Misleading Documentation• Lack of References in Driver Development• Difficulty in Obtaining Development Tools• Limited Support due to Outdated Operating

System• Inconsistent Results• Occasional Transfer Problems

Areas of Improvement• Reading Manuals Comprehensively

• Ordering Proper Packaged Types of Components

• Better Time Management– Allocating More Time for Integration– Planning Test Strategy

Future Plans• Optimize Display Algorithm• Package Hardware Components • Driver Modification for a different OS• Upgrading OS• Optimize software and Implement More

Features – Analysis of Saved Data– Record Input Sound in WAV format

Conclusion• True Capstone

– True Test of Theoretical and Practical Knowledge– Focus on Technical Side

• Feasible Project– Valuable Knowledge

• E.g. Stream driver on Windows CE OS

• Proof-of-Concept – Marketability to be Explored

Thank You…• Lucky One

• Freescale Technical Support

• Tom Roberts & Malcolm Slaney

• Steve Whitmore

• Fred Heep

• Analog Devices

Questions?“It’s finally over!”

sonosense technologies inc. handheld spectrum analyzer sanaz jahanbakhsh (ceo) johnny pak (coo)...

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