Emergency Response Radio Ashok Basawapatna Joe Friedrichsen Chris Lasek Jeff Ritter

Purpose A radio that alerts users to emergency broadcasts 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

Design Objectives Radio Block Radio Block –Receiver antenna –Isolation & Demodulator circuits Control Block Control Block –Signal detection –Combinational logic –Voltage and Power regulation Amplifier Block Amplifier Block

Functionality - Appearance 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 6 9

Functionality – Components Power Conditioning Radio Control Amplifier

Radio Block Radio Antenna Demodulator Power Radio Signal Power Radio Signal Tuner

Radio Block Receiver Antenna Receiver Antenna –Receive radio signals Isolation Circuit 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

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

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

Amplifier Block Amplify signal going to the speakers Amplify signal going to the speakers –Op-Amps vs. Transistors –Volume control

Division of Labor Isolation Circuit & Demodulator Isolation Circuit & Demodulator –Chris and Jeff Control block Control block –Ashok and Joe Voltage regulation & Amplifier Voltage regulation & Amplifier –Entire group Documentation Documentation –Entire group

Schedule

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

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

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

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