Next generation human body sensing - University of …davidc/pubs/tt2016_ac.pdfNext generation human...
Transcript of Next generation human body sensing - University of …davidc/pubs/tt2016_ac.pdfNext generation human...
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Next generation human body sensing
Alex Casson
@a_casson
www.eee.manchester.ac.uk/sisp
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Smart sensors
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Smart sensors in Manchester
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Me
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Online signal processing
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Reduce system power.
[Chen et al., Wearable sensors, 2014]
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Case study: Compression
1cm
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Compression on an Texas Instruments MSP430
[Imtiaz et al., IEEE T-BME, 2014]
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Improving battery lifetime
Wireless transmitter Local memory
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[Imtiaz et al., IEEE T-BME, 2014]
Compression on an Texas Instruments MSP430
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Improving battery size
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[Chen et al., Wearable sensors, 2014]
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Smart sensors
8[Chen et al., Wearable sensors, 2014]
Reduce system power.
Increase functionality.
Better quality recordings.
Minimise system latency.
Reduce amount of data to analyse.
Reliable operation over unreliable wireless.
Enable closed loop: recording – stimulation.
Data redaction for privacy.
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Design strategy
9[Chen et al., Wearable sensors, 2014]
ASICs Discrete components
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Low power CWT
420 µm
10[Casson et al., IEEE JSSC, 2011]
[Casson et al., EL, 2014]
Power: 60 pW – 1 nW
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ECG CWT
11[Casson et al., EL, 2014]
Power: 1.3 nW
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Low power DWT
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Power: 114 nW
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120 µm
[Casson, Sensors, 2015]
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State of the art
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[Casson, EUSIPCO, 2015]
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State of the artRef. Features Classifier Algorithm
performance
Power
performance
[Zhang,
2011]
Frequency information
(bandpass filter)
- - 3 µW
[Chen,
2011]
Signal agnostic compressive
sensing
10 dB SNR 2 µW
[Sridhara,
2011]
Frequency information
(FFT)
Threshold - 1 µW
[Lee,
2013]
Frequency information
(IIR filter)
SVM - 273 µJ /
classification
[Yoo,
2013]
Frequency information
(FIR filter)
SVM 83% detection rate
5% false rate
2 µJ /
classification
[Chen et al., Wearable sensors, 2014] 14
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TRADITIONAL ALGORITHMS:
– Two way trade-off: correct detections and false positives.
WEARABLE ALGORITHMS:
– Three way trade-off: correct detections, false positives, and power.
Wearable algorithms
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Power delivery
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Energy harvesting
1 μW: Analogue watch.
10 μW: Digital watch.
100 μW: Ultra low power sensor node.
1000 μW: Low power sensor node.
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Energy harvesting
Interesting
bio-signals
More power
More motion interference
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PPG during motion
Chest ECG
Wrist PPG
Foot PPG
[TomTom]
Time / s
PP
G / µ
VP
PG
/ µ
VE
CG
/ µ
V
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Signal processing
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Power consumption
Noise
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4.3% increase in performance
Case study: Noise
This can be
used to reduce
the noise
performance
and dynamic
range
requirements of
the hardware
and hence
reduce power
[Casson, HCII, 2013]
[Casson et al., J. Neurosci. Meth., 2011] 21
Example EEG
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Time varying performance
[Casson, Front. Neurosci., 2014]
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Electrodes
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[Wearable][IMEC][g.tec] [Cognionics] [Enobio] [Mindo]
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Transfer tattoos
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ECG electrodes:
• (Left) Conventional gel based Ag/AgCl.
• (Middle) Copper printed capacitive.
• (Right) Silver printed on tattoo paper.
[Batchelor et al., IEEE EMBC, 2015]
Signal-to-Noise Ratio / dB
Mean St. Dev.
Ag/AgCl
Time domain 19.9 0.9
CWT domain 36.2 0.7
Tattoo
Time domain 19.3 3.9
CWT domain 26.2 5.3
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Feedback / treatment
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Sound stimulation.
Transcranial current stimulation.
Aim:
Data driven treatments based upon time and power constrained signal
collection and analysis
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Summary
Individual personalised manufacture
Individual data response feedback and action
Individual optimized treatment
@a_casson
www.eee.manchester.ac.uk/sisp