May 11. 2013

AudioDAQ: Turning the Mobile Phone’s Ubiquitous Headset Port into a Universal Data Acquisition Interface

Sonal Verma, Andrew Robinson, and Prabal Dutta

発表者：浅見・川原研　　　　 M1 ジュ　ヒョンジェ

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Saturday, May 11, 13

Sensors Integrated into the Phone

✤ Accelerometers

✤ Gyroscopes

✤ Imagers

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Saturday, May 11, 13

Sensors Integrated into the Phone

✤ Accelerometers

✤ Gyroscopes

✤ Imagers

EKG Sensor

Air Quality Sensor

Soil Moisture Sensor

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Saturday, May 11, 13

Sensors Integrated into the Phone

✤ Accelerometers

✤ Gyroscopes

✤ Imagers

EKG Sensor

Air Quality Sensor

Soil Moisture Sensor

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Saturday, May 11, 13

Mobile Phone’s Headset Port

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Saturday, May 11, 13

Mobile Phone’s Headset Port

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Saturday, May 11, 13

Mobile Phone’s Headset Port

3✤ Mostly standardized across many mobile phone’s

Saturday, May 11, 13

Existing Phone Peripheral Interfaces

✤ Square card reader

✤ RedEye mini

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Saturday, May 11, 13

Existing Phone Peripheral Interfaces

✤ Square card reader

✤ RedEye mini

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What works for sporadic activities does not scale well to continuous sensing

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What is the AudioDAQ ?

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Saturday, May 11, 13

What is the AudioDAQ ?

✤ A new platform for continuous data acquisition using the headset port of a mobile phone.

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Saturday, May 11, 13

What is the AudioDAQ ?

✤ A new platform for continuous data acquisition using the headset port of a mobile phone.

Cost

Simplicity

Ubiquity

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Design

✤ ① Hardware Interface

✤ ② Mobile Phone

✤ ③ Processor

✤ ④ End User Applications

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Saturday, May 11, 13

Design

✤ ① Hardware Interface

✤ ② Mobile Phone

✤ ③ Processor

✤ ④ End User Applications

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Saturday, May 11, 13

Design

✤ ① Hardware Interface

✤ ② Mobile Phone

✤ ③ Processor

✤ ④ End User Applications

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Saturday, May 11, 13

Design

✤ ① Hardware Interface

✤ ② Mobile Phone

✤ ③ Processor

✤ ④ End User Applications

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Saturday, May 11, 13

Design

✤ ① Hardware Interface

✤ ② Mobile Phone

✤ ③ Processor

✤ ④ End User Applications

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Saturday, May 11, 13

Hardware Interface (1)

✤ Microphone Bias as Power Source

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Saturday, May 11, 13

Hardware Interface (1)

✤ Microphone Bias as Power Source

7Low pass filterSaturday, May 11, 13

Hardware Interface (1)

✤ Microphone Bias as Power Source

7Low pass filter

Scaling resistor

Saturday, May 11, 13

Hardware Interface (2)

✤ Acquiring analog sensor data

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Saturday, May 11, 13

Hardware Interface (2)

✤ Acquiring analog sensor data

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1.2 kHz

Saturday, May 11, 13

Hardware Interface (2)

✤ Acquiring analog sensor data

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1.2 kHz

Saturday, May 11, 13

Hardware Interface (1)

✤ Acquiring analog sensor data

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Saturday, May 11, 13

Hardware Interface (1)

✤ Acquiring analog sensor data

9High pass filterSaturday, May 11, 13

Capturing and Storing Data

✤ iOS✤ Advanced Audio Coding (AAC) - 44.1 kHz

✤ Android✤ Adaptive Multi-rate (AMR) - 8 kHz

✤ Others✤ Adaptive Multi-rate (AMR) - 8 kHz

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Processing Sensor Data

✤ Decoding

✤ Edge Detection

✤ Value Estimation

✤ Framing

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Saturday, May 11, 13

Processing Sensor Data

✤ Decoding

✤ Edge Detection

✤ Value Estimation

✤ Framing

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Saturday, May 11, 13

Processing Sensor Data

✤ Decoding

✤ Edge Detection

✤ Value Estimation

✤ Framing

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Saturday, May 11, 13

Processing Sensor Data

✤ Decoding

✤ Edge Detection

✤ Value Estimation

✤ Framing

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Saturday, May 11, 13

Low-Power EKG Sensor (1)

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✤ Block Diagram of the EKG Sensor System

Saturday, May 11, 13

Low-Power EKG Sensor (1)

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✤ Block Diagram of the EKG Sensor System

16$

Saturday, May 11, 13

Low-Power EKG Sensor (1)

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✤ Block Diagram of the EKG Sensor System

8$

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Low-Power EKG Sensor (2)

13The AudioDAQ board interfaced with 2-lead EKG sensor

Saturday, May 11, 13

Low-Power EKG Sensor (2)

13EKG trace of an individual

Saturday, May 11, 13

Low-Power EKG Sensor (2)

13EKG trace of an individual

P Wave

Saturday, May 11, 13

Low-Power EKG Sensor (2)

13EKG trace of an individual

Q Wave

Saturday, May 11, 13

Low-Power EKG Sensor (2)

13EKG trace of an individual

QRS complex

Saturday, May 11, 13

Low-Power EKG Sensor (2)

13EKG trace of an individual

T wave

Saturday, May 11, 13

Low-Power EKG Sensor (2)

13EKG trace of an individual

P P

Q Q

R R

S S

T T

Saturday, May 11, 13

Evaluation - System functionality and Power consumption

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Phone Works Power Sourced Power Drawn Battery Capacity Battery Life (est.)

iPhone4 Yes 322!W 149mW 5254mW 35 hrNexus One Yes 168!W 267mW 5180mW 19 hr

Galaxy Nexus Yes 247!W 301mW 6475mW 21 hrN900 Yes 120!W 270mW 4884mW 18 hr

E71 Yes 90!W 189mW 5550mW 29 hr

Saturday, May 11, 13

Evaluation - System functionality and Power consumption

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Phone Works Power Sourced Power Drawn Battery Capacity Battery Life (est.)

iPhone4 Yes 322!W 149mW 5254mW 35 hrNexus One Yes 168!W 267mW 5180mW 19 hr

Galaxy Nexus Yes 247!W 301mW 6475mW 21 hrN900 Yes 120!W 270mW 4884mW 18 hr

E71 Yes 90!W 189mW 5550mW 29 hr

Saturday, May 11, 13

Evaluation - System functionality and Power consumption

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Phone Works Power Sourced Power Drawn Battery Capacity Battery Life (est.)

iPhone4 Yes 322!W 149mW 5254mW 35 hrNexus One Yes 168!W 267mW 5180mW 19 hr

Galaxy Nexus Yes 247!W 301mW 6475mW 21 hrN900 Yes 120!W 270mW 4884mW 18 hr

E71 Yes 90!W 189mW 5550mW 29 hr

Saturday, May 11, 13

Evaluation - System functionality and Power consumption

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Phone Works Power Sourced Power Drawn Battery Capacity Battery Life (est.)

iPhone4 Yes 322!W 149mW 5254mW 35 hrNexus One Yes 168!W 267mW 5180mW 19 hr

Galaxy Nexus Yes 247!W 301mW 6475mW 21 hrN900 Yes 120!W 270mW 4884mW 18 hr

E71 Yes 90!W 189mW 5550mW 29 hr

Saturday, May 11, 13

Evaluation - System functionality and Power consumption

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Phone Works Power Sourced Power Drawn Battery Capacity Battery Life (est.)

iPhone4 Yes 322!W 149mW 5254mW 35 hrNexus One Yes 168!W 267mW 5180mW 19 hr

Galaxy Nexus Yes 247!W 301mW 6475mW 21 hrN900 Yes 120!W 270mW 4884mW 18 hr

E71 Yes 90!W 189mW 5550mW 29 hr

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Evaluation - Signal Recovery and Distortion

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A voltage sweep The error component

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Limitation

✤ Power Budget

✤ Coupling of Power and Data

✤ Sampling Rate

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Conclusion

✤ AudioDAQ

✤ Low cost

✤ Simple, ubiquitous and universal

✤ Low-rate analog sensor data capture, storage, and delivery

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Thank you for listening

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