Question Paper: Speech & Audio Signal Processing Question Paper - December 2016 - Electronics and Telecom Engineering (Semester 8) - Savitribai Phule Pune University (SPPU)
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## Speech & Audio Signal Processing - December 2016

### SPPU Electronics and Telecom Engineering (Semester 8)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

### Solve any one question Q.1(a, b) and Q.2(a, b)

1(a) Explain voiced and uninvoiced speech signal? Explain its significance in speech processing. 6 marks

1(b) What is Pitch of speech signal? What is formant frequencies in speech signal 6 marks

2(a) Explain LTV model of speech signal. 6 marks

2(b) Explain the concept of critical band and auditory systems as a fiter bank? 6 marks

### Solve any one question Q.3(a, b) and Q.4(a, b)

3(a) What is spectrogram? What are their types? Explain its significance and applications in speech processing. 6 marks

3(b) Explain Mel Scale and Bark Scale. 6 marks

4(a) How Short time energy, short time average meagnitude short time average zero crossing rate is useful in speech processing? 6 marks

4(b) Explain the concept of Spectral entropy and Spectral Roll-off. 6 marks

### Solve any one question Q.5(a, b) and Q.6(a, b)

5(a) Explain basic principal of Linear Predictive Analysis? Explain autocorrelation method for format analysis. 6 marks

5(b) Explain the Cholesky Decomposition method for solution of LPC equations. 6 marks

6(a) Explain frequency domain interpretation of LP analysis? 6 marks

6(b) Explain Durbin algorithm LPC analysis. 6 marks

### Solve any one question Q.7(a, b) and Q.8(a, b)

7(a) Explain how pitch is estimated using cesptrum analysis? 6 marks

7(b) Explain in detail estimation of formant and pitch parameters using cepstrum. 6 marks

8(a) What is cepstrum? Explain in detail computation of Mel Frequency Cepstral Coefficient (MFCC). 6 marks

8(b) What is long term complex cepstrum? What is short term complex cepstrum? Explain the properties of the complex cepstrum. 6 marks

### Solve any one question Q.9(a,b) and Q.10(a,b,c)

9(a) Explain in detail automatic speech recognition system with suitable example 6 marks

9(b) What is the difference between speaker identification and speaker verification? What are the features used for speaker recognition / verification system and how? 6 marks

10(a) What is DTW? Explain with suitable example. 6 marks

10(b) What are the techniques od speech enhancement spectral subtraction method? 6 marks

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