1. Isolated word, speaker independent speech recognition
Kaustubh R. Kale
Guide: Dr. John G. Harris
12/7/2018
EEL 6825 project

2. Project Goals To make appliances smart
Use Dynamic Time Warping algorithm
13 Mel frequency Cepstral coefficients as the extracted features
Gui development and hardware interface
12/7/2018
EEL 6825 project

3. Description Schematic Diagram Endpoint detection in Java
DTW analysis in Matlab
Parallel Port operations via C++
Demo
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12/7/2018
EEL 6825 project

4. Schematic Diagram
Java
Matlab
C++
Appliance
12/7/2018
EEL 6825 project

5. Endpoint detection in Java.
Utterances are of unequal lengths
Preceded by silence
Use of signal power
p[i..j] =  k=i..j s[k]2
                                              
12/7/2018
EEL 6825 project

6. DTW analysis in Matlab Two basic concepts to be understood:
1. Feature extraction from the time dependant signal
2. Distance calculation:
a.Local distance between features
b.Global distance between signals
12/7/2018
EEL 6825 project

7. DTW Flow To obtain a global distance, time alignment must be done
D(I,j)=min[D(I-1,j-1),D(I-1,j),D(I,j-1)] +d(I,j)
12/7/2018
EEL 6825 project

8. C++ interface with the port
The matlab passes on the a parameter to the C++ program
The C++ program drives the respective pins on the parallel port
The Parameters:
1 = lights and fan off
2 = lights on and fan off
3 = fan on and lights off
4 = lights on and fan on
12/7/2018
EEL 6825 project

9. Classification Errors
For speaker dependent operation the classification errors were 20%
For speaker independent operation the classification errors were 30%-40%
12/7/2018
EEL 6825 project

10. Demonstration
End to end operation
12/7/2018
EEL 6825 project

11. Future work Making the DTW more robust to ambient noise
Achieving speaker independent word recognition
Efficient inter component communication
12/7/2018
EEL 6825 project

12. Conclusion
Via this program the goal of having voice operated smart appliance was achieved
The error rate was around 20%
12/7/2018
EEL 6825 project

13. Thanks!
Question time…
12/7/2018
EEL 6825 project