Audio Over Bluetooth Author: Rory McCrave University of Central Florida Course: EEL4781-0M01 Instructor: Dr. Janusz Zalewski Date: April 15, 2002

Contents of Presentation Problem Description Design Solution Case Study Conclusion

Problem Description Satisfy business demand for wireless communication solutions Satisfy consumer demand for wireless multimedia products Satisfy the need for a “Wireless Standard”

Design Solution Bluetooth Technology Synchronous Connection-Oriented (SCO) channels Robust Compression CODEC Log PCM- A-law or m-law compression Continuous Variable Slope Delta Modulation Low Noise Transmission Bluetooth Audio Signal Processor

Position of Audio in the Bluetooth Protocol Stack

Synchronous Connection Oriented (SCO) channels

Robust Compression CODEC CVSD Encoder

CVSD Modulation Signal

Low Noise Transmission Frequency Hopping Scheme

Bluetooth Audio Signal Processor Encoder Decoder

Case Study - Toshiba Bluetooth Enabled Headset Voice-Recognition/Outputs Digital Control Signal - to control other bluetooth enabled devices High Quality Audio Reproduction - for the hi-fi wireless monitoring of various audio devices

TV PC “The sky is blue.” Home Stereo System Figure 1 Voice Control/ Dictation Function Bluetooth Enabled TV Digital Control Signals are Sent Vocalization The sky is blue. “STEREO ON” TV CHANNEL UP” PC “The sky is blue.”

Stereo or TV Audio TV MP3 Audio PC Figure 2 High Quality Audio Monitoring Bluetooth Enabled TV Stereo or TV Audio MP3 Audio MP3 PC

Commercialization of Headsets Price: Under $76 Weight: 100 grams Battery: lithium-ion rechargeable battery Battery life: 5 hours Safety: Electromagnetic Radiation not harmful because of its high operating frequency and low power output

Conclusion Standardization of Bluetooth Advantages of Bluetooth Audio Technology Disadvantages of current Bluetooth Audio Future Expectations for Bluetooth Enabled Products

Thank You! Any Questions?