comprehensive design review
DESCRIPTION
Comprehensive Design Review. Team Vibraid March 2014. Vibraid. Michael Balanov (Mike) EE. Spyridon Baltsavias (Spiros) EE. Reona Otsuka (Leo) EE . Andrew Woo (Andy) EE. Previous Block Diagram. 4. 4. 8. 4. 4. 4. variable resistance. variable resistance. s witch signal. - PowerPoint PPT PresentationTRANSCRIPT
Comprehensive Design Review
Team VibraidMarch 2014
VibraidMichael Balanov(Mike) EE
Spyridon Baltsavias(Spiros) EE
Reona Otsuka(Leo) EE
Andrew Woo(Andy) EE
Previous Block Diagram
44
4 4 4 8
switch signal
variable resistance
variable resistance
Revised Block Diagram
44
4 4 4 4
switch signal
variable resistance
variable resistance
Demo Outline
• 4 way directionality amplitude comparison• Microphone inputs, processing and output functioning
correctly.• Filter not yet integrated but functional
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
Determining Time delay
• Use cross-correlation of pair of signals
• Find argmax, corresponding to delay (in samples) between signals
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
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 10kHzBelt circumference 75-105cm (small-large)Belt width <10cmBelt thickness <5cmProduct weight <1kgDetection directionality 4 directionsVibration response time <o.5secVibration directionality Vibration to alert user in one quadrantVibration to corresponding detection 99% of timesTunable sensitivity Block-all till pass-allTunable frequency detection 4 modes: full range, 100Hz to 4kHz, 4kHz to 7kHz,
7kHz to 10kHzTunable motor strength No vibration (0V) to Max supply (5V)
Q&A
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
Pros and Cons of Design
• Pros• Intuitive polar representation• Horizontal orientation• Adjustable
• Cons• User may need to tuck in their shirt• Hand/clothing obstruction
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+alarmshttp://en.wikipedia.org/wiki/Vehicle_hornhttp://www.livescience.com/38298-cry-analyzer-could-indicate-babies-health.html
Dd
Gantt chart