pro a v wireless intercom l.
Skip this Video
Loading SlideShow in 5 Seconds..
Pro A/V Wireless Intercom PowerPoint Presentation
Download Presentation
Pro A/V Wireless Intercom

Loading in 2 Seconds...

play fullscreen
1 / 17

Pro A/V Wireless Intercom - PowerPoint PPT Presentation

  • Uploaded on

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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Pro A/V Wireless Intercom' - paul

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
specific design approaches
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.
issues and solutions
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.
communication team


Micah Wu

Daniel Anderson

Nathaniel Anderson

pending tasks
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.
block diagram
Block Diagram

Base Station




From Audio Input

From HC11 Serial Output

To Serial Input Logic



To HC 11

Serial Input



To Headphone Mixer

Audio In

Audio Out

Data Transmitter

From HC 11

Serial Output

Audio/Data Transmitter

Audio Transmitter

Audio Receiver

individual responsibilities
Individual Responsibilities
  • Micah Wu
    • Antenna Design
    • Hardware Assembly
  • Daniel Anderson
    • Power Supply Selection
    • Hardware Assembly
  • Nathaniel Anderson
    • Filter Design
    • Hardware Assembly
audio team

Audio Team

William Peacock

Chris Barber

Omar Saleem

pending tasks9
Pending Tasks


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.


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

block diagram10
Block Diagram

Audio Out

Intercom In

Audio In








Headphone Amplifier


individual responsibilities11
Individual Responsibilities
  • William Peacock
    • VOX/PTT Completion
    • Hardware Assembly
  • Chris Barber
    • Audio Amplifier Completion
    • Hardware Assembly
  • Omar Saleem
    • Noise Reduction Completion
    • Hardware Assembly
microprocessor control

Microprocessor Control

Rajpartap Khangura

Clint Kelley

pending tasks13
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.
block diagram14
Block Diagram






Serial Port 0 Tx

Keypad/LCD Display


Serial Port 1 Tx

Serial Port 1 Rx

CS1 on HP3

CS2 on HP3

To data transmitter

From data receiver

individual responsibilities15
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.

Week 1

Week 2

Week 3


Antenna Design



Build communication components

Assemble Intercom

Test and implement

Audio and Data


Amplifier and VOX/PTT Completion

Assemble Intercom



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

  • 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.