14EC3029 SPEECH AND AUDIO SIGNAL PROCESSING

Question Bank

05-08-2015 (Class Test-1)

1. Draw the Schematic diagram of vocal-apparatus and explain the mechanism of speech

production. (10)

2. Describe the voiced and unvoiced speech signal In teams of speech spectrum. (10)

3. Differentiate in detail, the voiced and unvoiced speech model. (10)

4. Explain the operation of the vocal tract and drive the transfer function. (10)

5. Discuss about the excitation mechanism of speech production. (10)

6. What are the characteristics of the lossless tube model of vocal tract? Bring out the

transfer function of vocal tract for voiced and unvoiced speech inputs. (10)

7. Explain the discrete time model of excitation process for voiced and unvoiced signals.

Also draw the glottal pulse and spectrum for voiced speech signal. (10)

8. Write the transfer function of Lip radiation model and also draw the frequency

response (10)

9. Draw the discrete time model of speech production and drive the transfer function of

the accurate digital filter based model. (15)

10. Briefly explain about the classification of speech sound signals with respect to nature

of source, shape of the vocal tract, time domain waveform and time varying spectral

characteristics. (15)

11. Categorise the speech sound by changing vocal tract shapes with illustration (10)

12. What are the types of phonemes in American English? Specify with at least one

example in each case. (10)

13. What are the nasals? How they are produced? specify the reasons for broadening of

nasal resonances. (10)

07-08-2015 (Class Test -2)

14. Draw the anatomy of the ear and explain the three sections of ear in detail. (10)

15. Describe the importance of Basilar Membrane (BM) of inner ear and also draw the

unrolled longitudinal section. (10)

16. What are critical band filters? Discuss the following non uniform filter banks: 1) Log

frequency scale 2) Bark frequency scale. (10)

17. What is the delta Mel (m) in the Mel scale for the following bands? List out your

inference on the relationship between m and f for the below two situations.

a. When the input frequency ranges from 200 to 800 Hz (f=600Hz)

b. When the input frequency ranges from 6000 to 7000 Hz (f=1000Hz). (10)

18. Calculate the inter band frequency masking threshold with help of Terhardt's Auditory

masking model. Assume that the masking threshold is produced by 10 spectral

components and the component u=5 being the masker. (10)

19. Explain the inter band masking threshold with and without masker for various Sound

Pressure Levels (SPLs) (10)

20. Discuss briefly about intra band masking and just noticeable distortion (JND) (10)

21. Illustrate the pre and post masking phenomena in human auditory perception. (10)

22. a) For a 20 KHz, 16-bit sampling signal, how many bytes are used in 5 seconds?

b) A sound file has a storage size of 440 Kbytes with the resolution of 16 bit. How

long is the play time if it is played at 22 KHz rate? (10)

23. Define Perceptual Audio Quality Measure (PAQM) and subjective quality measure.

How the PAQM is calculated and validated with subjective quality measure of Mean

Opinion Score (MOS)? (10)

24. Why Cognitive Effects are important in Judging Audio Quality? Draw the block

diagram of the basic approach in the development of cognitive corrected PAQM

model and explain. (10)