Design Team 9

1
Design Team 9

• Wireless Headphone System

Team 9 - ECE 480 - Michigan State University
2
Background

• Headphones on Market are High Cost
• High Fidelity System
• Desire for Low Cost System

Sony MDR-DS6000 95 ft 299.99
RCA WHP141 150 ft 62.99
Acoustic Research 150 ft 104.99
Sennheiser RS-130 300 ft 169.99
Prices from ww.bestbuy.com
Team 9 - ECE 480 - Michigan State University
3
Objective

• Create a Wireless Headphone System
• Plugs into any Headphone Jack
• Economically priced

Team 9 - ECE 480 - Michigan State University
4
Specifications

• Hardware
• MSP430 microcontroller
• Chipcon RF device
• Low Power
• 3 Hour Life
• Low Cost
• Below 20
• Reasonable Sound Quality
• 30 ft Range

Team 9 - ECE 480 - Michigan State University
5
Estimated Manufacturing Cost
Team 9 - ECE 480 - Michigan State University
6
Block Diagram
Team 9 - ECE 480 - Michigan State University
7
Hardware Design

• TI MSP430 family
• MSP430F155
• On Transmitting Side
• MSP430F2254
• On Receiving Side
• Chipcon Transceivers
• CC1100
• CR2450 Button Batteries
• TPA0211 Power Amplifier

Team 9 - ECE 480 - Michigan State University
8
Software Design

• Stages
• TX Side LPF RF Packet Formation
• RX Side RF Packet Handling D/A Conversion
• C Programming Language
• Code Space Estimate 16 KB
• Compression Algorithm
• Differential Pulse Code Modulation
• 31 Compression Ratio
• Efficient

Team 9 - ECE 480 - Michigan State University
9
Risk Analysis

• Choosing the Best Processors
• Best Memory Size
• A/D, D/A Conversion
• Choosing the Best Transceivers
• Transmission Frequency
• Sampling Rate
• Maintain Low Power System

Team 9 - ECE 480 - Michigan State University