october 2009

Car Communication based on Bluetooth Links ITN, 15-16 October 2009, Lingotto Fiere, Turin

October 2009

Car Communication Based on Bluetooth Links

Michael HERVE


Plan of the Presentation

IntroductionBluetooth LinkInterest of Bluetooth for car communicationDifferent phases of Bluetooth Hands-Free connectionImprovementsConclusion


Origin of Bluetooth

Idea of universal compatibilityWireless LinkHands-Free systems Interest of using Bluetooth for car communication

Introduction


Introduction

Bluetooth LinkInterest of Bluetooth for car communicationDifferent phases of Bluetooth Hands-Free connectionImprovementsConclusion


Bluetooth Link

Mobile Network Link

Mobile PhoneBluetooth Device

Bluetooth Link


Bluetooth Link

Mobile Network Link

Mobile Phone


Bluetooth Link

Mobile Network Link

Mobile PhoneBluetooth Device

Bluetooth Link


Bluetooth Coding

sinus wave (440 Hz)


Bluetooth Codingsinus wave (440 Hz)

encoded by bluetooth


Bluetooth General Information

Wireless Connection (2.4 Ghz) Low Power (1mW for Hands Free) compare to 2W for GSM

Idea of universal compatibilityWireless LinkHands-Free systems Interest of using Bluetooth for car communication


Bluetooth Radio


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


IntroductionBluetooth Link

Interest of Bluetooth for car communicationDifferent phases of Bluetooth Hands-Free connectionImprovementsConclusion


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


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


IntroductionBluetooth LinkInterest of Bluetooth for car communication

Different phases of Bluetooth Hands-Free connectionImprovementsConclusion


Different phases of Bluetooth Hands free kit connection

Discovery

Pairing

Detection of Profiles

Connection

Data Synchronisation

Hello, I am looking for bluetooth devices

Hello, I am an available Bluetooth

device



Discovery

Pairing


Connection


What is your authentification

Code ?

1234…This code has to be typed on your keyboard

Ok !Now we are

paired



Discovery

Pairing


Connection


What type of profile do you

support ?

I can do headset and hands-free.

What about you ?



Discovery

Pairing


Connection


Ok, we are now connected in Hands-free.

I can do hands-free.



Discovery

Pairing


Connection


To complete my phonebook,

I have to synchronise

with your contacts

Ok, I transfer my 163

contacts.


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)

Phonebook synchronisation

AutomaticAlessandro Del PieroGianluigi BuffonFabio CannavaroFabio GrossoTiagoDavid Trezeguet

Alessandro Del Piero

Gianluigi Buffon

Fabio Cannavaro

Fabio GrossoTiago

David Trezeguet


IntroductionBluetooth LinkInterest of Bluetooth for car communicationDifferent phases of Bluetooth Hands-Free connection

ImprovementsConclusion


Disabling phone algorithms

Could you please disable

your signal processing

algorithms ?

Ok !



Could you please disable

your signal processing

algorithms ?

No !

???OkBut in fact it’s a no !


Initial noised signal


No longer…


Common gain on the audio chain

Bluetooth Device

Telephony Network

Mobile phone with Gain 1

Mobile phone with Gain 2

0 1 2 3 4 5 6

x 104

-1.5

-1

-0.5

0

0.5

1

1.5x 10

4

time

mag

nitu

de

0 1 2 3 4 5 6

x 104

-1.5

-1

-0.5

0

0.5

1

1.5x 10

4

time

mag

nitu

de

0 1 2 3 4 5 6

x 104

-1.5

-1

-0.5

0

0.5

1

1.5x 10

4

time

mag

nitu

de

I can hear you very well …

I CANNOT HEAR YOU

!


Improvements: Bluetooth for wideband telephony… coming soon

NarrowBand WideBand

speech signal

Encoded via Bluetooth


IntroductionBluetooth LinkInterest of Bluetooth for car communicationDifferent phases of Bluetooth Hands-Free connectionImprovements

Conclusion


Conclusion

Presentation of BluetoothIntegration of Bluetooth in car communicationLimits and exemple of problems encounteredThe future of Bluetooth


Thank you !

QUESTIONS ?

october 2009

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