Comparing two audio files

1. Comparing two audio files
Colorado State University
School of Biomedical and Electrical Engineering
Prepared by Student: Minh Anh Nguyen
Email: minhanhnguyen@q.com

2. Audio Detection System
Verification of Design Prototype validation

3. Both bearings loaded correctly
Line up two random signal

4. Upper bearing loaded incorrectly

5. Upper bearing loaded incorrectly
Line up two random signal

6. Audio Detection System: prototype evaluation
Audio detect loading errors
Upper/Lower bearings
loaded incorrectly
Both bearings loaded
correctly
Predictive values
Centrifuge
misloading
test
+
True Positive (TP)
73
False positive (FP)
0
Total test positive
TP +FP = 73
-
False Negative (FN)
6
True Negative (TN)
26
Total test negative
FN + TN = 33
Total with bearings
loaded incorrectly
TP+FN = 79
Total with bearings
loaded correctly
FP+TN = 26
Total tests
TP+FP+FN+TN = 105
Sensitivity=TP/(TP+FN)
=0.924= 93%
Specificity=TN/(TN+FP)
= 1= 100%
positive predictive
value = TP/(TP+FP) =
100%
negative predictive
value= TN/(TN+FN) =
.78 = 78%
Accuracy = TP +TN/ Total tests = .9428 = 94%

7. Audio Detection System
Prototype Evaluation
0.000
0.200
0.400
0.600
0.800
1.000
0.000 0.200 0.400 0.600 0.800 1.000
Post-TestProbabilitiyofmisloadingissue
Pre-Test Probability of misloading issue
Graph of Conditional Probabilities
Test Negative Test Positive

8. Suggested future work
• Use the encoder and NI myRIO motor adapter to
detect position and control speed of centrifuge.
Use NI myRio, Labview code and microphone kit
which can buy National instrument to record and
analyze the misloading issues.

9. Concluding thoughts
• Tests results show that the audio prototype
met the project expectation and produced a
reliable method for identifying loading
problems.