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Pro A/V Wireless Intercom Specific Design Approaches Implement the shortest possible path for all communications. Utilize HP3, RM, and LC series Linx modules for separate wireless links. Employ a Motorola 68HC12 to provide user selectable frequency selection of the HP3’s.

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Specific design approaches l.jpg
Specific Design Approaches

  • Implement the shortest possible path for all communications.

  • Utilize HP3, RM, and LC series Linx modules for separate wireless links.

  • Employ a Motorola 68HC12 to provide user selectable frequency selection of the HP3’s.

  • Provide a wireless link between serial ports of the microprocessors to allow data communication.


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Issues and Solutions

  • Interference and noise in wireless links.

    • Implement more direct communication (no retransmission of information).

    • Headset to headset – intercom, base station to base station – call feature, base station to headset – channel selection and additional features.

  • Difficulty employing digital technology.

    • Design all audio circuits for high quality analog communications.

  • Synchronous serial communication required for HP3 channel selection.

    • Utilize a synchronizer and combinational logic to recreate the clock pulse.


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CommunicationTeam

Micah Wu

Daniel Anderson

Nathaniel Anderson


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Pending Tasks

  • Try to further eliminate noise using filters and adjusting channel frequency separation.

  • Consider power requirements and choose power supplies.

  • Implement the optimum antenna design for each wireless link.

  • Construct circuit components.

  • Interface with the other team’s components.


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Block Diagram

Base Station

Headset

Data

Receiver

From Audio Input

From HC11 Serial Output

To Serial Input Logic

Audio/Data

Receiver

To HC 11

Serial Input

Audio/Data

Switch

To Headphone Mixer

Audio In

Audio Out

Data Transmitter

From HC 11

Serial Output

Audio/Data Transmitter

Audio Transmitter

Audio Receiver


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Individual Responsibilities

  • Micah Wu

    • Antenna Design

    • Hardware Assembly

  • Daniel Anderson

    • Power Supply Selection

    • Hardware Assembly

  • Nathaniel Anderson

    • Filter Design

    • Hardware Assembly


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Audio Team

William Peacock

Chris Barber

Omar Saleem


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Pending Tasks

VOX/PTT

Finalize the design and build the system that activates the transmitter and deactivates the receiver using the low power option on the HP3 modules. The VOX system rectifies the output of the microphone pre-amp and closes a relay to complete the HP3’s power down circuit. The push button directly completes the circuit.

Noise Reduction

Finalize the design of an audio mixer and second microphone system to block unwanted background noise.

Amplifiers

Finalize the design of the low-noise microphone pre-amps and power headphone amplifiers


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Block Diagram

Audio Out

Intercom In

Audio In

Microphone

Pre-amp

Mixer

Mixer

VOX /PTT

Microphone

Pre-amp

Headphone Amplifier

Headset


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Individual Responsibilities

  • William Peacock

    • VOX/PTT Completion

    • Hardware Assembly

  • Chris Barber

    • Audio Amplifier Completion

    • Hardware Assembly

  • Omar Saleem

    • Noise Reduction Completion

    • Hardware Assembly


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Microprocessor Control

Rajpartap Khangura

Clint Kelley


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Pending Tasks

  • Implement the wireless serial data transmission for the call functions.

  • Design the synchronizer circuit to allow the asynchronous HC12 serial port to change channels on the HP3 modules.

  • Assist the other groups in implementing their components.


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Block Diagram

Audio/Data

Transmitter

Audio/Data

Receiver

Microprocessor

Serial Port 0 Tx

Keypad/LCD Display

Synchronizer

Serial Port 1 Tx

Serial Port 1 Rx

CS1 on HP3

CS2 on HP3

To data transmitter

From data receiver


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Individual Responsibilities

  • Rajpartap Khangura

    • Complete the call system.

    • Assist the communication team.

  • Clint Kelley

    • Design the synchronizer and implement the channel selection function.

    • Assist the audio team.


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Week 1

Week 2

Week 3

Timeline

Antenna Design

Communication

Team

Build communication components

Assemble Intercom

Test and implement

Audio and Data

Transceiver

Amplifier and VOX/PTT Completion

Assemble Intercom

Audio

Team

Build and test headset

Noise Reduction and Mixer Completion

Channel and Keypad Program

Integrate Program

Assemble Intercom

Microprocessor Team

Assist Other Groups

Call Program

Integrate Program


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Conclusion

  • Each block of the project is near the end of the design phase.

  • Circuit assembly of all components will be complete by November 10.

  • Working prototype will be completed by November 15.


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