Objectives • Design and build a wireless intercom for pro a/v applications. • Employ digital technology for high quality communications. • Implement a call feature to allow the user to signal individual users or groups. • Utilize a wireless base station and headset for each user.
Approach • Three teams to design and build separate components of each unit. • Utilize off the shelf components for functions such as encoding/decoding. • Employ a microprocessor for channel tuning and call tasks. • Implement separate transceivers for base station to base station, headset to base station, and call communications.
Base Station Communication Micah Wu Daniel Anderson Nathaniel Anderson
Team Tasks • Design and build a device that can effectively transmit digital audio and data over a distance of 500 ft. • Implement CVSSD/ADM encoder/decoder to increase transmission quality and reduce bandwidth requirements. • Construct two 2.4 GHz transceivers. • 10 Channel digital audio transceiver • Fixed frequency call data transceiver • Design a non directional antenna that maximizes transmission distance. • Interface with other components.
Block Diagram Base Station Data Receiver From headset receiver To headset transmitter To microprocessor CVSSD/ADM Codec Encoder/Decoder Data Transmitter From microprocessor Digital Audio Transmitter Digital Audio Receiver
Individual Responsibilities • Micah Wu • Antenna Design • Encoder/Decoder Implementation • Daniel Anderson • Audio Transceiver Design • Hardware Assembly • Nathaniel Anderson • Data Transceiver Design • Part Acquisition
Headset Team William Peacock Chris Barber Omar Saleem
Team Tasks Receiver/Transmitter Design and build a transceiver to send audio to and from the headset and base station. VOX/PTT Design and build a system that allows the user to activate the intercom through voice activation or push button. Noise Reduction Design and build a system to block unwanted background noise.
Block Diagram Base Station Base Station Circuits Headset Receiver Headset Transmitter Headset Receiver Headset Transmitter Microphone Pre-amp Noise Reduction VOX /PTT Microphone Pre-amp Headphone Amplifier Headset
Individual Responsibilities • William Peacock • VOX/PTT Design • Part Acquisition • Chris Barber • Audio Transceiver Design • Hardware Assembly • Omar Saleem • Noise Reduction Design • Amplifier Design
Microprocessor Control Rajpartap Khangura Clint Kelley
Team Tasks • Design and implement the call functions. • Employ a system to allow the user to change base station channels. • Design and build user interface for the base station. • Assist the other groups in implementing their components.
Block Diagram Keypad/User Interface Receiver/Transmitter Channel Selector Microprocessor To data transmitter From data receiver
Individual Responsibilities • Rajpartap Khangura • Program functions for the call system. • Integrate the microprocessor with the data transceiver. • Assist the headset team • Clint Kelley • Program keypad input and channel selection functions. • Integrate the microprocessor with the digital audio transceiver. • Assist the base station team.
Timeline Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Antenna Design Assemble Intercom Base Station Group Audio Transceiver Design Build and Test Base Station Data Transceiver Design VOX/PTT Design Evaluate Project Problems Assemble Intercom Headset Group Audio Transceiver Design Noise Reduction Design Channel and Keypad Program Integrate Program Assemble Intercom Microprocessor Group Assist Other Groups Call Program Integrate Program
Conclusion • Each person responsible for completing tasks on time. • Weekly group meeting to evaluate team progress. • Working prototype will be completed by November 6.