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Emergency Response Radio. Ashok Basawapatna Joe Friedrichsen Chris Lasek Jeff Ritter. Purpose. A radio that alerts users to emergency broadcasts Constantly monitors specified frequency Broadcasts emergency message when the Emergency Alert System is activated

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Emergency Response Radio

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Emergency response radio l.jpg

Emergency Response Radio

Ashok Basawapatna

Joe Friedrichsen

Chris Lasek

Jeff Ritter


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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


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Design Objectives

  • Radio Block

    • Receiver antenna

    • Isolation & Demodulator circuits

  • Control Block

    • Signal detection

    • Combinational logic

    • Voltage and Power regulation

  • Amplifier Block


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Functionality - Appearance

1

2

3

4

5

6

10

9

8

7

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


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Radio

Power Conditioning

Control

Amplifier

Functionality – Components


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Radio

Radio Block

Radio Signal

Power

Antenna

Radio Signal

Demodulator

Tuner

Power


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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

Radio Block


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Control

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

Digital Switches

Power to Standard Radio

Standard Radio Signal

Power to Amplifier

ERR Radio Signal

Chosen Radio Signal


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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


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Amplifier Block

  • Amplify signal going to the speakers

    • Op-Amps vs. Transistors

    • Volume control


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Division of Labor

  • Isolation Circuit & Demodulator

    • Chris and Jeff

  • Control block

    • Ashok and Joe

  • Voltage regulation & Amplifier

    • Entire group

  • Documentation

    • Entire group


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Schedule


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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


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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


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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.


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Additions & Extensions

  • Adapt to car and home stereos

  • Design portable version

  • Extend to control TV

  • Peripheral device compatible with old radios


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