Electrical & Computer Engineering Wireless Music Sharing Team Ganz: Mike O’Malley™ Ben LaPointe Erik Christensen Nhat Khai Nguyen

2 Electrical & Computer Engineering Scenario  John and Matt are listening to music in ECE 232  John wants to listen to Matt’s music  Matt sets his “Team Ganz” player to transmit  John sets his “Team Ganz” player to receive  John now has Matt’s music streaming wirelessly to his headphones  Jill wakes up and sees John listening to Matt’s music  She sets her “Team Ganz” player to receive  John and Jill are both listening to Matt’s music

3 Electrical & Computer Engineering Goals  Allow music to be shared wirelessly between portable music players  Broaden users’ musical exposure  Store information on music listened to for later purchase

4 Electrical & Computer Engineering Big picture: User level

5 Electrical & Computer Engineering Proposed device functionality  Transmit Mode Listen to your own music Wirelessly send current music selection to other users Provide data such as song title, artist, and player ID  Receive Mode Wirelessly receive music from transmitter Displays data such as song title and artist to user Allow user to rate the music selection Able to select which transmitter to receive from  Sync Mode Sync song information and ratings to PC Store MP3s on music player Charge battery

6 Electrical & Computer Engineering Inter-device Diagram Transmitter Receiver

7 Electrical & Computer Engineering Possible Audio Source Models  Line in audio source (In-line Encoder)  Bluetooth audio source (Repeater)  Standalone

8 Electrical & Computer Engineering Line in audio source (In-line Encoder)  Features Used to support legacy digital music players Must encode stereo audio Song information provided through manufacturer specific connection Insert inline between player and headphones  Pros Compatible with any analog audio source Users can keep existing player  Cons Song information may not be available Song information through vendor specific cable

9 Electrical & Computer Engineering Bluetooth audio source (Repeater)  Features Support Bluetooth players and accessories such as naviPlay for the iPod Bluetooth must be able to receive and transmit at the same time  Pros Transmitting requires no codec conversions Compatible with other Bluetooth transmitters  Cons Repeater will have to use a Bluetooth 2.x Enhanced Data Rate (EDR) chipset – 3Mbps allows multiple stereo audio links

10 Electrical & Computer Engineering Standalone Audio Source  Features Built-in Flash or Disk storage Needs MP3 Decoder Song info from ID3 tags  Pros Time-invariant audio source Complete control over the audio path ID3 tags provide easy song information  Cons Users must switch to our device and discard previous player Added expense of MP3 decoder

11 Electrical & Computer Engineering Block Diagram

12 Electrical & Computer Engineering Wireless Design Goals  Near CD quality sound  Range between 10 and 100 meter Trade off with power consumption  Multiple Transmitters in the same area  Broadcast from one transmitter to several receivers  Transmit song and user data  Standardized for compatibility

13 Electrical & Computer Engineering Wireless Options  FM with Radio Data System (RDS) Broadcasts well Find empty frequencies Small amount of data in RDS  WiFi m range (power hungry) Needs to use multicast for broadcasting Needs to form Ad-hoc networks and discover devices  Zigbee – only meant for slow data rates  WiMedia – chipsets do not have advanced features  Bluetooth <10m, 10m, or 100m device classes Point to Multipoint available on some chipsets Chips made to transmit stereo audio to headsets Can only broadcast to 7 other devices Generic Media Control Profile for song and other information

14 Electrical & Computer Engineering One Proposed Solution  Broadcom BCM2037 Bluetooth 2.0 with Enhanced Data Rate (EDR) 3 Mbps Multiple stereo links Low power Integrated Radio  STA027 SBC codec Stereo encoding and decoding  STA013 MP3 decoder  TI stereo audio codec

15 Electrical & Computer Engineering Currently Selected Parts Block Diagram

16 Electrical & Computer Engineering Current Status  TI samples in route  ST Microelectronics samples in route  s out to Bluetooth chips manufactures and distributors  Will make calls next week to lock in Bluetooth SoC

17 Electrical & Computer Engineering Design Dilemma Matrix ManufacturerModelBT 1.x BT 2.x EDRA2DP AV RCPSBCMP3FlashUSBI2SI2C BroadcomBCM2037xxxxxxxxx CSR Bluecore3 - Multimediaxxxxxxxx Bluecore4xxxxx Bluecore5 - Multimediaxxxxxxxxx RF MicroSiW4000xxxxxxxx GCT SemiconductorsGDM5104xxxxxxxx TIBRF6300xxxxx XemicsZE1401xxxxxxxx ST MicroelectronicsSTA013xxx STA027xxx Portal PlayerPP5024xxxxx AtmelAT83SND2CMP3xxxxx SigmaTelSTMP35xxxxxxx Cirrus LogicEP7312xxxxx

18 Electrical & Computer Engineering MPR Specifications  Test I2S and I2C buses  Test each chip to learn how to integrate it  Sample communications over Bluetooth  Hardware layout