Project

# Title Team Members TA Documents Sponsor
27 Global Active Noise Cancellation for Cell Phone Privacy
 Hershed Tilak
Joel Godard
 design_document0.document
final_paper0.pdf
presentation0.pdf
proposal0.pdf
The motivation for this project is to provide privacy for those making cell phone calls in public spaces. Achieving audio isolation would pose great benefits to both the cell phone user as well as those surrounding him/her. We will be investigating the feasibility of using active noise cancellation to suppress the voice of a cell phone user globally. This method of isolation employs destructive interference and hinges on the collocation of both the initial sound source and the source of noise cancellation in order to achieve the desired global noise control. Furthermore, the destructively interfering signal must maintain equal amplitude with the initial signal over all space in order to provide complete cancellation. The investigation will be performed at first on a dummy object that is roughly the size of a standard cell phone. Microphones along with supporting circuitry will be located on the dummy cell phone in order to obtain the initial signal (speaker's voice). The signal will then be passed to a digital signal processor which will change its phase by 180 degrees. Finally, speakers on the back of the dummy cell phone will be used to emit this inverted signal in order to actively cancel the person's voice in the far field. A characterization of the pattern of spatial intensity of the human voice will be performed, and different speaker placements will be studied in hope of providing the best cancellation over a large area surrounding the person using the phone.

Interactive Proximity Donor Wall Illumination

Sungmin Jang, Anita Jung, Zheng Liu

Interactive Proximity Donor Wall Illumination

Featured Project

Team Members:

Anita Jung (anitaj2)

Sungmin Jang (sjang27)

Zheng Liu (zliu93)

Link to the idea: https://courses.engr.illinois.edu/ece445/pace/view-topic.asp?id=27710

Problem:

The Donor Wall on the southwest side of first floor in ECEB is to celebrate and appreciate everyone who helped and donated for ECEB.

However, because of poor lighting and color contrast between the copper and the wall behind, donor names are not noticed as much as they should, especially after sunset.

Solution Overview:

Here is the image of the Donor Wall:

http://buildingcampaign.ece.illinois.edu/files/2014/10/touched-up-Donor-wall-by-kurt-bielema.jpg

We are going to design and implement a dynamic and interactive illuminating system for the Donor Wall by installing LEDs on the background. LEDs can be placed behind the names to softly illuminate each name. LEDs can also fill in the transparent gaps in the “circuit board” to allow for interaction and dynamic animation.

And our project’s system would contain 2 basic modes:

Default mode: When there is nobody near the Donor Wall, the names are softly illuminated from the back of each name block.

Moving mode: When sensors detect any stimulation such as a person walking nearby, the LEDs are controlled to animate “current” or “pulses” flowing through the “circuit board” into name boards.

Depending on the progress of our project, we have some additional modes:

Pressing mode: When someone is physically pressing on a name block, detected by pressure sensors, the LEDs are controlled to

animate scattering of outgoing light, just as if a wave or light is emitted from that name block.

Solution Components:

Sensor Subsystem:

IR sensors (PIR modules or IR LEDs with phototransistor) or ultrasonic sensors to detect presence and proximity of people in front of the Donor Wall.

Pressure sensors to detect if someone is pressing on a block.

Lighting Subsystem:

A lot of LEDs is needed to be installed on the PCBs to be our lighting subsystem. These are hidden as much as possible so that people focus on the names instead of the LEDs.

Controlling Subsystem:

The main part of the system is the controlling unit. We plan to use a microprocessor to process the signal from those sensors and send signal to LEDs. And because the system has different modes, switching between them correctly is also important for the project.

Power Subsystem:

AC (Wall outlet; 120V, 60Hz) to DC (acceptable DC voltage and current applicable for our circuit design) power adapter or possible AC-DC converter circuit

Criterion for success:

Whole system should work correctly in each mode and switch between different modes correctly. The names should be highlighted in a comfortable and aesthetically pleasing way. Our project is acceptable for senior design because it contains both hardware and software parts dealing with signal processing, power, control, and circuit design with sensors.

Project Videos