F 10000EC463122003 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Regular and Supplementary Examination December 2021 (2015 Scheme)

Course Code: EC463
Course Name: SPEECH AND AUDIO SIGNALPROCESSING
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks

1 a) Explain acoustic model of speech production? Discuss the production of (10)
voiceless fricative sounds and plosives , voiced fricatives and plosives and nasal
sounds

b) Describe short-term-energy and short-term zero crossing rate of speech signal? (5)

2 a) Define MFCC of speech signal. Explain the step involved in obtaining MFCC (10)

coefficients of a speech signal.

b) Define STFT and why it is used for speech processing (5)

3 ல Explain principle of linear prediction and its application in speech processing? (8)

b) Explain the basic blocks in a speech recognition system (7)
PART B

Answer any two full questions, each carries 15 marks.
4 a) List various steps involved in language identification (7)

0) What is the role of speech enhancement technique? Explain any one method of (8)
speech enhancement technique with block diagram
5 a) Explain principles of speaker identification & speaker verification and Discuss (10)
the constrains faced in identification & verification?
b) What are the different types of frequency masking? (5)
6 a) Explain the functioning of human ear ?What reason can you give to explain why (10)

a low frequency tone is better able to mask a tone of higher frequency than vice

versa ?
b) Explain the critical band structure of auditory filter. (5)
PART C
Answer any two full questions, each carries 20 marks.
7 லி Explain MPEG 2 AAC encoder and decoder with neat block diagrams. (10)

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