Bluetooth in car communication

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Car Communication Based on Bluetooth Links
Michael HERVE
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Plan of the Presentation

• Introduction
• Bluetooth Link
• Interest of Bluetooth for car communication
• Different phases of Bluetooth Hands-Free
  connection
• Improvements
• Conclusion

3
Introduction

• Origin of Bluetooth
• Idea of universal compatibility
• Wireless Link
• Hands-Free systems
• Interest of using Bluetooth for car communication

4

• Introduction
• Bluetooth Link
• Interest of Bluetooth for car communication
• Different phases of Bluetooth Hands-Free
  connection
• Improvements
• Conclusion

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Bluetooth Link
Mobile Network Link
Bluetooth Link
Bluetooth Device
Mobile Phone
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Bluetooth Link
Mobile Network Link
Mobile Phone
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Bluetooth Link
Mobile Network Link
Bluetooth Link
Bluetooth Device
Mobile Phone
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Bluetooth Link
Mobile Network Link
Bluetooth Link
Bluetooth Device
Mobile Phone
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Bluetooth Coding
sinus wave (440 Hz)
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Bluetooth Coding
sinus wave (440 Hz) encoded by bluetooth
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Bluetooth General Information

• Wireless Connection (2.4 Ghz)
• Low Power (1mW for Hands Free) compare to 2W for
  GSM
• Idea of universal compatibility
• Wireless Link
• Hands-Free systems
• Interest of using Bluetooth for car communication

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Bluetooth Radio
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Bluetooth profiles

• What is a profile ?
• Interface specification for communication between
  devices
• Large range of services for bluetooth devices
  (Hands-free, A2DP (audio streaming), File
  Transfert, Printer, IRMC, )
• Devices must be able to know which profiles are
  in commun with devices that want to be connected
  with.
• Discovery Protocol

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• Introduction
• Bluetooth Link
• Interest of Bluetooth for car communication
• Different phases of Bluetooth Hands-Free
  connection
• Improvements
• Conclusion

15
Interest of Bluetooth for car

• Enable the connection with different phones (for
  the different users of the car)
• No Harware/cable is needed
• High compatibility between phone and the device
• Phonebook synchronisation
• Ringtone
• Volume
• Accept/Refuse call
• Discret Mode
• DTMF
• Software can be updated easily

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Interest of Bluetooth for car

• Security Reasons
• Goal having all phone functionnalities with an
  easier
• HMI (Human to Machine Interface)
• Hands must be substituted by the voice
• Bluetooth allows universal links with most of
  the phones

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• Introduction
• Bluetooth Link
• Interest of Bluetooth for car communication
• Different phases of Bluetooth Hands-Free
  connection
• Improvements
• Conclusion

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Different phases of Bluetooth Hands free kit
connection
Hello, I am looking for bluetooth devices
Discovery
Pairing
Hello, I am an available Bluetooth device
Detection of Profiles
Connection
Data Synchronisation
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Different phases of Bluetooth Hands free kit
connection
What is your authentification Code ?
Discovery
1234 This code has to be typed on your keyboard
Pairing
Detection of Profiles
Connection
Ok ! Now we are paired
Data Synchronisation
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Different phases of Bluetooth Hands free kit
connection
What type of profile do you support ?
Discovery
Pairing
I can do headset and hands-free. What about you ?
Detection of Profiles
Connection
Data Synchronisation
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Different phases of Bluetooth Hands free kit
connection
Discovery
Pairing
Ok, we are now connected in Hands-free.
Detection of Profiles
Connection
I can do hands-free.
Data Synchronisation
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Different phases of Bluetooth Hands free kit
connection
To complete my phonebook, I have to synchronise
with your contacts
Discovery
Pairing
Detection of Profiles
Connection
Ok, I transfer my 163 contacts.
Data Synchronisation
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Phonebook synchronisation

• The Hands Free synchronizes its phonebook with
  the contacts on the mobile phone.
• The phonebook is vocally available at any time
  through Voice Recognition, Text To Speech Voice
  Tags.
• Synchronisation is done only once (at first
  connection)

Alessandro Del Piero
Automatic
Gianluigi Buffon
Fabio Cannavaro
Fabio Grosso
Tiago
David Trezeguet
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• Introduction
• Bluetooth Link
• Interest of Bluetooth for car communication
• Different phases of Bluetooth Hands-Free
  connection
• Improvements
• Conclusion

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Disabling phone algorithms
Could you please disable your signal processing
algorithms ?
Ok !
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Disabling phone algorithms
Could you please disable your signal processing
algorithms ?
No !
???
Ok
But in fact its a no !
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Initial noised signal
Disabling phone algorithms
No longer
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Common gain on the audio chain
I can hear you very well
Telephony Network
Mobile phone with Gain 1
Bluetooth Device
I CANNOT HEAR YOU !
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Common gain on the audio chain
I can hear you very well
Telephony Network
Mobile phone with Gain 1
Bluetooth Device
I CANNOT HEAR YOU !
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Improvements Bluetooth for wideband telephony
coming soon
NarrowBand WideBand
speech signal
Encoded via Bluetooth
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• Introduction
• Bluetooth Link
• Interest of Bluetooth for car communication
• Different phases of Bluetooth Hands-Free
  connection
• Improvements
• Conclusion

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Conclusion

• Presentation of Bluetooth
• Integration of Bluetooth in car communication
• Limits and exemple of problems encountered
• The future of Bluetooth

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Thank you !
QUESTIONS ?