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FM CONVERTER

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FM CONVERTER Team Members Team Responsibilities Project Significance Car radios do not have audio inputs Current Technology Options Cassette adapters are the most ... – PowerPoint PPT presentation

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Title: FM CONVERTER


1
FM CONVERTER
2
Team Members
Dan Harkins Team Leader
George Henry
Dr. Georgios Lazarou Advisor
Beau Blackwell
Shawn Welch
3
Team Responsibilities
4
Project Significance
  • Car radios do not have audio inputs
  • Many cars only have a CD or cassette player
  • FM converter can be used with FM radio
  • Keeps the owner from having to buy and install
    entire audio system

5
Current Technology Options
  • Cassette adapters are the most widely used means
    to play one audio device through another
  • Cassette Player Adapters

Existing tape player needed
Excess wiring can get in the way
Limited signal quality
6
Design Diagram
Signal from Audio Device
Process Signal (Convert to FM Signal)
Transmit Converted FM signal to FM receiver
7
Implementation
8
Design Specifications
1. Operating Frequency Operate throughout on
the standard FM radio range (87.9-107.9 MHz)
2. Weight Target weight is eight ounces
3. FCC Requirements Must be compliant with
Part 15 of FCC regulations
4. Signal Clarity The unit will be able to
broadcast a stereo signal through the air
5. Packaging Final product will be
approximately 5 x 3 x 3
  • 6. User Interface The unit will feature
  • push-button style tuner
  • LCD to display the operating frequency
  • Input signal LED

9
Design Specifications
7. Durability Must be resilient to the bumps
and bruises that can occur to a portable
device.
  • 8. Power Requirements Will operate off
  • Four AA batteries
  • AC converter
  • 12V DC Adapter
  • 9. Cost
  • Prototype Components 80 90
  • Mass production costs approximately
  • 10- 20 of our prototype cost

10. Audio Input The converter will use RCA
audio inputs.
10
Benefits of RCA Connection
  • Cord more commonly used and widely available
  • Greater versatility
  • RCA inputs offer the possibility to use both RCA
    and headphone outputs
  • Increased cord life
  • Cords can be removable for storage
  • User can replace worn or damaged cord without
    having to replace the entire unit

11
Benefits Over Tape Adapters
  • Portability
  • No wires to connect to FM receiver
  • Light-weight
  • Can be used with any FM receiver
  • Signal Clarity
  • No tape hiss
  • Low interference
  • Automotive design minimizes interference

12
Benefits of FM vs. AM
  • More widely used than AM radio
  • Consumers more familiar with FM dial
  • Better signal to noise ratio
  • Less interference than AM radio
  • Nearby electronic devices can cause noise
  • Even weather can cause static on AM radio

13
Typical Decibel S/N Ratios
AM broadcast / telephone 25 dB (worst)
Audio Cassette Player 35-45 dB
FM broadcast 50-60 dB
Compact Disc 90-105 dB (best)
14
Test Specifications
Design Constraints
Radio Frequency
Signal Strength
Operation Voltage
Antenna Efficiency
Signal to Noise Ratio
Reliability
Pspice






Matlab






Performance Test






O-Scope






Spectrum Analyzer






15
Simulation
16
Jan Feb Mar Apr May
Aug Sep Oct Nov Dec
Research
Prototype
Simulation
Performance Testing
Debugging
Final Documentation
17
FM CONVERTER
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