Emergency Response Radio

1
Emergency Response Radio

• Ashok Basawapatna
• Joe Friedrichsen
• Chris Lasek
• Jeff Ritter

2
Purpose

• A radio that alerts users to emergency broadcasts
• Constantly monitors specified frequency
• Broadcasts emergency message when the Emergency
  Alert System is activated
• Otherwise behaves as normal radio

3
Design Objectives

• Radio Block
• Receiver antenna
• Isolation Demodulator circuits
• Control Block
• Signal detection
• Combinational logic
• Voltage and Power regulation
• Amplifier Block

4
Functionality - Appearance

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10
9




1. Emergency Radio Tuner Indicator

6. Power Button

2. Emergency Radio Band Selector

7. Volume Knob

3. Emergency Radio Tuner Knob

8. Standard Radio Tuner Knob

4. Emergency Radio Manual Override Button

9. Standard Radio Band Selector

5. Manual Override Light

10. Standard Radio Tuner Indicator


5
Functionality Components
6
Radio Block
Radio Signal
Power
Antenna
Radio Signal
Demodulator
Tuner
Power
7
Radio Block

• Receiver Antenna
• Receive radio signals
• Isolation Circuit
• Sets radio to desired frequency
• Tunable band-pass filter
• Tank circuit other peripheral circuitry

• Demodulator Circuit
• Separate voice from carrier signal
• Scheme?
• Synchronous vs. Asynchronous
• Digital vs. Analog

8
Control Block
Power
Power to ERR
Power to Standard
ERR Radio Signal
Power to Amplifier
Standard Radio Signal
Chosen Radio Signal
User Input
Power
Tone Recognition
ERR Radio Signal
EAS Tone Matched?
Power
Logic
User Input
On/Off/ Override
Emergency!
Power to ERR
Power
Power to Standard Radio
Digital Switches
Standard Radio Signal
Power to Amplifier
ERR Radio Signal
Chosen Radio Signal
9
Control Block

• Detect emergency broadcast
• DSP vs. ASICs vs. Analog Notch filters
• Combinational logic
• Determine which tuner becomes amplified
• Override button
• Power allocation
• Voltage Regulation
• DC-DC Converters
• Buck Boost converters
• Voltage regulator chips

10
Amplifier Block

• Amplify signal going to the speakers
• Op-Amps vs. Transistors
• Volume control

11
Division of Labor

• Isolation Circuit Demodulator
• Chris and Jeff
• Control block
• Ashok and Joe
• Voltage regulation Amplifier
• Entire group
• Documentation
• Entire group

12
Schedule
13
Risks Contingency Plans

• Learning to use DSP and ASIC chips
• Use analog notch filters
• Control block responding to incorrect signal
• Build higher order filter / Use additional
  filters
• Use different chip
• Use of OP-AMP amplifier questionable
• Use BJT or MOSFET transistors
• Other amplifier ASICs

14
Marketability

• Could benefit a broad audience
• Many listen to the radio
• Affordable to all levels of income
• Applicable to many areas
• Could be adapted to car and portable radios

15
Cost Analysis

• Return on Investment
• Estimated Cost
• Prototype 250
• Components 15
• Time 800 man-hours (25/hr 20,000)
• Sale Price
• 25
• Payback
• Sell 810 units before making profit.

16
Additions Extensions

• Adapt to car and home stereos
• Design portable version
• Extend to control TV
• Peripheral device compatible with old radios