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Comprehensive Design Review
Team Vibraid
March 2014
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VibraidMichael Balanov(Mike) EE
Spyridon Baltsavias(Spiros) EE
Reona Otsuka(Leo) EE
Andrew Woo(Andy) EE
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Previous Block Diagram
44
44 4 8
switch signal
variable resistance
variable resistance
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Revised Block Diagram
44
4 4 4 4
switch signal
variable resistance
variable resistance
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Demo Outline
• 4 way directionality amplitude comparison
• Microphone inputs, processing and output functioning correctly.
• Filter not yet integrated but functional
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FPR Goal - Revised RequirementsSpecification Value
Max detection radius for 50dB-120dB sound within frequency range
3m (10ft) , 90% of times
• How to meet spec?
• Amplitude comparison algorithm modifications
• Time delay estimation between input sound signals
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Determining Time delay
• Use cross-correlation of pair of signals
• Find argmax, corresponding to delay (in samples) between signals
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FPR Goal - Revised RequirementsSpecification Value
Max detection radius for 50dB-120dB sound within frequency range
3m (10ft) , 90% of times
Frequency detection range 100Hz to 10kHz
• Sampling frequency?
• 10kHz ADC on Arduino
• 4 inputs -> 10k/4 = 2.5kHz each
• 1.25kHz maximum signal
• Important sound frequencies
• Baby cry: 300 – 440 Hz
• Car Horn: 400 – 500 Hz
• Alarms and sirens: 1 - 3 kHz
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FPR Goal - Revised RequirementsSpecification Value
Max detection radius for 50dB-120dB sound within frequency range
3m (10ft) , 90% of times
Frequency detection range 100Hz to 10kHz
Belt circumference 75-105cm (small-large)
Belt width <10cm
Belt thickness <5cm
Product weight <1kg
Detection directionality 4 directions
Vibration response time <o.5sec
Vibration directionality Vibration to alert user in one quadrant
Vibration to corresponding detection 99% of times
Tunable sensitivity Block-all till pass-all
Tunable frequency detection 4 modes: full range, 100Hz to 4kHz, 4kHz to 7kHz, 7kHz to 10kHz
Tunable motor strength No vibration (0V) to Max supply (5V)
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Q&A
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CDR Deliverables• Goal: Demonstrate 4-way detection and vibration directionality
• Correct quadrant determination
• Meet range, frequency specs
• Implement working user interface
• Prototype filter
• Implement levels of motor activation
• Portable power supply
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Pros and Cons of Design
• Pros
• Intuitive polar representation
• Horizontal orientation
• Adjustable
• Cons
• User may need to tuck in their shirt
• Hand/clothing obstruction
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Sprectrum of potential sound sources
• Baby cry: 300 – 440 Hz
• Car Horn: 400 – 500 Hz
• Alarms and sirens: 1 - 3 kHz
https://www.google.com/search?q=frequency+range+of+alarams&oq =frequency+range+of+alarams&aqs=chrome..69i57.5644j0j1&sourceid= chrome&espv=210&es_sm=122&ie=UTF-8#q=frequency+range+of+alarms
http://en.wikipedia.org/wiki/Vehicle_horn
http://www.livescience.com/38298-cry-analyzer-could-indicate-babies-health.html
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D
d
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Gantt chart