MP3toFMMP3toFM

Final PresentationFinal Presentation

April 24, 2008April 24, 2008

About UsAbout Us

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Brandon LeatherwoodCPE/SEEthernet DesignSystem Integration

Josh WilsonCPEMP3 DecoderLCD

Michael WeirCPEServer SetupSystem Integration

Lyn HicksEEFM TransmitterAntenna Design

OverviewOverviewIntroductionIntroduction ProblemProblem SolutionSolution

TestingTesting Streaming FormatStreaming Format Ethernet ControllerEthernet Controller MicroprocessorMicroprocessor

Constraint StatusConstraint StatusDesign II GoalsDesign II GoalsQuestionsQuestions

ProblemProblem

Current products are restricted by portability, Current products are restricted by portability, storage capacity, and sound quality.storage capacity, and sound quality. MP3 playersMP3 players FM TransmittersFM Transmitters Wireless Ethernet Boom-boxesWireless Ethernet Boom-boxes Home Audio SystemsHome Audio Systems

SolutionSolutionMP3toFM deviceMP3toFM device PortablePortable Access to entire home PC library of audio Access to entire home PC library of audio

trackstracks Operates over EthernetOperates over Ethernet

System Diagram System Diagram

MP3toFM

uPEthernet Controller

Streaming MP3MP3

Decoder

Raw MP3

FM TransmitterAntenna

Analog Signal

Control lines

Data Flow

Server SoftwareServer Software SoftwareSoftware

ServerServer IcecastIcecast

GPLGPL Password protectedPassword protected

StreamingStreaming WinampWinamp

Re-encodingRe-encoding ProprietaryProprietary Allows for free distribution. Allows for free distribution. [5]

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Required ProtocolsRequired Protocols

• UDP (User Datagram Protocol)UDP (User Datagram Protocol) Required for DHCP protocolRequired for DHCP protocol

• DHCP (Dynamic Host Configuration Protocol)DHCP (Dynamic Host Configuration Protocol) Required for plug and play network configurationRequired for plug and play network configuration

• TCP (Transmission Control Protocol)TCP (Transmission Control Protocol) Required for Icecast protocolRequired for Icecast protocol

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Network Testing ToolsNetwork Testing Tools

• WIZnet Testing ApplicationWIZnet Testing Application Custom applicationCustom application Tests TCP, UDP protocolsTests TCP, UDP protocols Configurable data sizes and data ratesConfigurable data sizes and data rates

• Wireshark (formerly Ethereal)Wireshark (formerly Ethereal) Promiscuously capture network packetsPromiscuously capture network packets Provides GUI for packet analysisProvides GUI for packet analysis

1010

DHCP Test ResultsDHCP Test Results

1111

TCP Test ResultsTCP Test Results

MP3 Decoder Prototype TestMP3 Decoder Prototype Test

MP3 Sine TestMP3 Sine Test

• Command SequenceCommand Sequence• 0x53, 0xEF, 0x6E, n, 0x53, 0xEF, 0x6E, n,

0x00, 0x00, 0x00, 0x000x00, 0x00, 0x00, 0x00• n - defines final n - defines final

frequencyfrequency• Verifies MP3 hardware/FM Verifies MP3 hardware/FM

transmittertransmitter

MCU Sine TestMCU Sine Test• Initialize Buffer with the MP3Initialize Buffer with the MP3• Send MP3 data to DecoderSend MP3 data to Decoder

Integration / Bit Rate Integration / Bit Rate

Bitrate (kbit/s)Bitrate (kbit/s)

6464 128128 192192 256256 320320

Clicks/PopsClicks/Pops XX

HaltsHalts XX XX XX

Speed DistortionSpeed Distortion XX XX

Integrated ComponentsIntegrated Components Icecast, Ethernet Controller, MCU, MP3 Decoder, FM Icecast, Ethernet Controller, MCU, MP3 Decoder, FM

transmittertransmitter Testing Testing

64 kbit/s constraint meet64 kbit/s constraint meet Wiznet Buffer limiting factorWiznet Buffer limiting factor Tweaking - Icecast settings and Buffer size could Tweaking - Icecast settings and Buffer size could

increase the bit rateincrease the bit rate

Political ConcernsPolitical ConcernsFCC Unlicensed Broadcast ComplianceFCC Unlicensed Broadcast Compliance

[2],[3]

RegulationsRegulations

250 µV/m at 3 meters250 µV/m at 3 meters

100 feet100 feet

Good Engineering Good Engineering

PracticePractice

TestingTesting

Distance TestDistance Test

Ethical ConcernsEthical Concerns Limiting Liability due to Illegal Music Sharing Limiting Liability due to Illegal Music Sharing

[1]

MethodsMethods StatusStatus

Password ProtectionPassword Protection IncompleteIncomplete

EULAEULA CompleteComplete

Digital Millennium Digital Millennium

Copyright ActCopyright ActEffective Effective

Since Since 19981998

Technical Constraints StatusTechnical Constraints Status

ConstraintConstraint StatusStatus

Configurable Server Re-encodingConfigurable Server Re-encoding CompleteComplete

Hardware Decoding (64kbps)Hardware Decoding (64kbps) ExceedsExceeds

Audio Quality (16 Bit Depth, 44.1 kHz Audio Quality (16 Bit Depth, 44.1 kHz Sample Rate)Sample Rate)

CompleteComplete

50’ FM Transmission50’ FM Transmission CompleteComplete

FM Frequency RangeFM Frequency Range

(88-108 MHz)(88-108 MHz)

CompleteComplete

Design II GoalsDesign II Goals

Implement on PCBImplement on PCB

Password ProtectionPassword Protection

Create Physical HousingCreate Physical Housing

Design User InterfaceDesign User Interface

Create Marketing StrategyCreate Marketing Strategy

ReferencesReferences[1] U.S. House of Representatives and Senate. “Digital Millennium Copyright Act,” [Online].Available: http://thomas.loc.gov/cgi-bin/query/F?c105:1:./temp/~c105hUH0aP:e57148:.[Accessed: February 9, 2008].

[2] FlowTV. “A Critical Forum on Television and Media Culture,” February 16, 2008. [Online]. Available: http://flowtv.org/wp-content/uploads/2007/09/fcc-logo.gif

[3] Federal Communications Commission. “47 CFR Part 15,” February 16, 2008.[Online]. Available: http://www.fcc.gov/oet/info/rules/part15/part15-9-20-07.pdf

[4] Xiph Open Source Community. “Icecast,” [Online]. Available: http://www.icecast.org. [Accessed: February 28, 2008].

[5] Winamp. “Winamp Software Distribution Agreement,” [Online]. Available: http://www.winamp.com/legal/distribution. [Accessed: February 28, 2008].