System Dynamics Filtering Preliminary Test Plan

I. Engineering Specification

1. Audio Level (ES1) Verify Audio Volume

2. Hand-on Activity (ES2) Hardware and Software Hand-on

3. Activity Environment (ES3) Activities must be performed using Laboratory instrumentation

4. Demonstrative (ES4) Verify filtering is noticeable Software image filter display before and after

5. Dimensions (ES5,ES6, ES7) Product dimensions 12x12x6” max PCB dimensions 9x12” max Breadboard size 4x3” max

6. Power (ES8) Power is received to all necessary components Verify hardware operation with 5V DC power

7. Software Image (ES9) Software filters image 800x600

8. Hardware Audio Length (ES10) Recording length 10 seconds minimum

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

1. Test 1: Audio Level

Test verifies the audio level is safe and loud enough for the user to hear it from a distance of 1ft. This means the audio level is below 120dB and above 30dB.

Requirements Verification: ES1

Personnel or Equipment:

Decibel meter

Figure 1: Decibel meter app (Android)

Using decibel meter, verify audio level is above quiet whisper of 30dB and below threshold of pain of 120dB.

Procedure:1. Play Sound2. Measure Audio from a 1ft. away.3. If the decibel meter reads less than 30dB, raise the volume.4. If the decibel meter reads more than 120dB, lower the volume.5. Stop one you have reached an adequate volume.

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

Figure 2: Test 1 Flow Chart

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

2. Test 2: Hand-on Activity

Test objective is to verify the requirement requested to make the make to laboratory experiment hands-on for the user to be engaged.

Requirements Verification: ES2

Personnel or Equipment:

Laboratory environment Students

Hand-on activity procedures must be engaging for students to learn. Such verification requires multiple tests consisting of various different students. The students must finish the laboratory experiment within the given time with the assistance of a professor or teacher assistant (TA). A statistical analysis can be used to demonstrate the number of times the student is distracted from the experiment, demonstrating the level of engagement of the experiment. Below is a list of the essential details that must be evaluated during each laboratory experiment.

Is the student distracted from the procedures? Is the student frequently in doubt of what to do? Is the lab manual easy to comprehend? Does the student need further background to complete the experiment? How long did it take the student to complete the experiment?

The questions above can be used to create a statistical analysis which demonstrates what the laboratory manual is lacking. The student must complete both the software and hardware experiments to satisfy the specification. The experiments must be engaging for the students without major help from professor and teacher assistant. If the studies show the students are not learning from the experiment, the laboratory manual must be changed to make the experiment more engaging.

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

3. Test 3: Activity Environment

The activity environment test is performed to confirm the experiment is done in an adequate environment.

Requirements Verification: ES3

Personnel or Equipment:

Students

The experiments must be performed using laboratory instrumentation provided. All of the requirements to complete the experiments are listed on the laboratory manual. The instrumentation required will be provided to each individual student to complete the experiments. To test the environment, multiple students will be placed in a laboratory with the necessary equipment. If the student lacks any kind of instrumentation including connectors and cables, the professor or teacher assistant will provide with the necessary tools and take note for future experiments.

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

4. Demonstrative

Both hardware and software experiments must be demonstrative for the student to learn the essence of filtering. The hardware demonstrates filtering by playing and audio signal. The software demonstrates filtering by displaying an image. Both types of filters can be altered whether it is hardware or software. By changing the cut-off frequency of the filter in hardware, the filter neglects the specified frequencies. This can be done by changing the component (resistors & capacitors) values of the filter. To change the software filter, an adjustable slider is provided on the GUI (Graphical User Interface) to allow the user to change the intensity of each filter. Audio Filtering is noticeable

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

Image Filtering is noticeable

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

5. Dimensions

Verifying the dimensions of the production can be done with any measuring tool with the units of inches.

Product Dimensions

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

PCB Dimensions

Breadboard Dimensions

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

6. Power

Power verification is performed visually and using a voltmeter. Power must be verified in all the necessary components. The PCB board receives 7V from the front panel, in which the user inputs the voltage from a DC power supply. The PCB includes a circuit which regulates the voltage to 5V DC once the voltage is regulated; a LED turns on indicating the power is on. The regulated 5V is distributed to the ISD recording board which has its own LED as an indicator that it has power. Further verification is done by measuring the voltage at the test point shown below.

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

7. Software Image

Software image must be large enough to demonstrate filtering. Verify the GUI displays both before and after image as shown below.

High-pass filter example:

Before After

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A

8. Hardware Audio Length

The product must allow the student to record 10 seconds. Using the ISD-COB1760 shown below, the user may record up to 60 seconds. Verify the audio length exceeds 10 seconds by pressing and holding the REC button longer than 10 seconds while speaking into the microphone on the board. Then play back the recorded audio by pressing the play button.

P13361 Preliminary Test Plan January 9 th, 2013, Rev – A