F 10000EC463122002

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Pages: 1

Seventh Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

Course Code: EC463
Course Name: SPEECH AND AUDIO SIGNAL PROCESSING
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Write the algorithm for computing LPC coefficients using autocorrelation (8)
method.
b) Define briefly the idea behind short time energy and short time zero crossing (7)
rate.
2 a) Explain with the help of a neat diagram the acoustic theory of speech production. (8)
b) Define mathematically the need of STFT & Spectrogram in speech signals. (7)
3 a) Explain with the help of a block diagram the steps involved in obtaining MFCC (7)
coefficients of a speech signal.
b) Define the fundamentals of Speech recognition. (8)
PART ‏تا‎
‎Answer any two full questions, each carries 15 marks.
4 a) Explain the significance of sub-banding coding for speech signals. (8)
b) List various steps involved in language identification. (7)
5 a) Define the steps of speaker verification in ೩ speech signal. (7)
b) Explain MPEG psychoacoustic model of audio perception. (8)
6 a) Explain the psycho-acoustic analysis steps of an audio signal. (8)
b) With the help of a neat diagram, explain the anatomy of hearing System. (7)
PART C
Answer any two full questions, each carries 20 marks.
7 a) Explain mathematically the concept of MDCT and its properties. (10)
b) Briefly define the audio compression methods. (10)
8 a) Explain any two subjective analysis methods to measure the audio quality. (10)
b) Explain any two spatial audio standards. (10)
9 a) Explain any one objective analysis method to analyse the audio quality. (10)
b) Briefly define the MPEG2-AAC coding standard of digital audio. (10)

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