Deployable Noise Meter Preliminary Detailed Design Review

Transcription

1 Deployable Noise Meter Preliminary Detailed Design Review 11/3/2016

2 Team Members and Roles Mandala Murphy - ME Zachary Maher - ME Sergio Martins - CE Nathan Burlee - EE Vashti Green - EE Jillian Walsh - EE

3 Problem Overview Project Goal Create a device that measures and shows the excitement level for all colleges at convocation Project deliverables The device must be durable, deployable, capable of quantifying noise levels in a large space, and reasonable accurate Must also accommodate the NTID students

4 Team Vision During the preliminary detailed design phase, we plan to test the feasibility of the final concept selected. During this phase we will conduct feasibility testing on different microphones to help narrow down the specific components required for our concept. We will also test if we can use the onboard Analog-Digital-Converter (ADC) on a microcontroller. Test plans are going to be developed to test final device to ensure that the product completes customer requirements. Accomplishments: Selected final concept Contacted tech crew about borrowing/free mics for feasibility testing Conducted feasibility testing and analysis Drawings, Schematics, Flow Charts Update benchmarking Bill of Material (BOM) Test Plans Risk Assessment

5 Final Concept Mounted camera on rafters just pointing at NTID section 5 dynamic microphone array around field house floor 4 on the corners 1 omnidirectional mic in the middle Color saturation to display results Sound map of the area

6 Audio Feasibility: Test 1 - XLR Mic Equipment: Breadboard XLR Mic XLR Connector XLR Mic Stand Procedure: Mic connected to a breadboarded inverting op amp circuit Oscilloscope mimicked the intensity of noise delivered to the mic A 440Hz tone was played 0-10 inches in increments of 2 inches away from mic Outputs: After 8 inches, the noise was too great to collect useful signal

7 Audio Feasibility: Test 2 - XLR Mic w/ Filter Equipment: Breadboard XLR Mic XLR Connector XLR Mic Stand Procedure: Mic connected to a breadboarded inverting op amp circuit with a low pass filter Oscilloscope mimicked the intensity of noise delivered to the mic A 440Hz tone was played 0-10 inches in increments of 2 inches away from mic Outputs: Filter allowed a cleaner signal to be produced After 8 inches, the noise was still too great to collect useful signal

8 Audio Feasibility: Test 3 - Surface Mount Mic Equipment: Breadboard Surface Mount Mic Procedure: Mic connected to a breadboarded inverting op amp circuit with a low pass filter Oscilloscope mimicked the intensity of noise delivered to the mic A 440Hz tone was played 0-10 inches away in increments of 2 inches away from mic Outputs: After 6 inches, surface mic unable to produce any signal Surface mic cannot be used

9 Audio Feasibility: Test 4 - Dynamic Mic Equipment: Breadboard Dynamic Mic Bluetooth Speaker Procedure: Mic connected to a breadboarded non-inverting op amp circuit with a low pass filter Oscilloscope mimicked the intensity of sound delivered to the mic A 440Hz tone was played at varying vertical distances away from mic. Outputs: Mic was able to pick up a recognizable signal at 16ft Possibly retest the XLR mic with the new setup to verify the cheaper dynamic mic is achieving more useful results

10 Audio Feasibility: Test 5 - Dynamic Mic with Cheering Equipment: Breadboard Dynamic Mic Bluetooth Speaker Procedure: Mic connected to a breadboarded inverting op amp circuit with a low pass filter Oscilloscope mimicked the intensity of noise delivered to the mic Cheering was played through the speaker to simulate what we might actually hear at convocation Outputs: We were able to differentiate between clapping, shouting, etc. due to variations in the output signal

11 Audio Feasibility: Test 6 - Dynamic Mic Indirect Sound Equipment: Procedure: Breadboard Dynamic Mic Bluetooth Speaker Speaker Desks and workspace in between 12 ft Outputs: Dynamic Mic 7.75 ft Mic connected to a breadboarded inverting op amp circuit with a low pass filter Oscilloscope mimicked the intensity of noise delivered to the mic A 440Hz tone was played at approximately 14 feet away, with a desk in the way to block the sound Mic was able to pick up a recognizable signal at 14ft This produced acceptable signal results while having objects in between

12 Audio Feasibility: Test 7 - Dynamic Mic Single Clap Equipment: Breadboard Dynamic Mic Procedure: Mic connected to a breadboarded inverting op amp circuit with a low pass filter Oscilloscope mimicked the intensity of noise delivered to the mic A single clap was tested, 1 foot from the mic Outputs: We determined the frequency of a clap, so that we won t create a filter to filter out this frequency

13 Overall Conclusions from Audio Feasibility Testing 1. We need a gain and filter to receive desirable data. a. b. 2. Dynamic mic will be used. a. b A gain of at least 10k would be desireable A low pass filter of at least 16kHz is also desirable. Cheap Can pick up data from a large enough distance An external ADC must be utilized. May end up using more microphones for accuracy.

14 Feasibility of Video 1 Video taken of Silent Applause with a top-down orientation Fourier Transform was applied to find the spectrum Determine possibility of using this method to analyze the video

15 Video Feasibility Resulting spectrum is shown below. Note: Quadrants have not been reordered

16 Video Feasibility A second test was performed to test the outputs of the Fourier Derived Spectra This test compared the angle of the camera with head-on, 45-degrees, and top-down being the options. Also compared the motion in the video, with calm, clapping, and silent applause being the options. All nine combinations were run, and then put through the Fourier Transform

17 Video Feasibility To Be Resulting Spectra.

18 Overall Conclusions from Video Feasibility Testing TBF: Need to resize video clips

19 System Architecture Flow of Energy Flow of Information

20 Benchmarking Audio

21 Ideal Polar Patterns Cardioid Polar Pattern Omnidirectional Polar Pattern

22 Bill of Materials

23 Test Plan Test each component Test each subsystem Microphone ADC Microcontroller Webcam Video Au3dio Test final configuration Make sure receiving desired output

24 Risk Assessment

25 Phase 4 Gantt Chart

26 Q&A.