Download PTU B.Tech 2021 Jan ECE 5th Sem 78711 Speech And Audio Processing Question Paper

Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January ECE 5th Sem 78711 Speech And Audio Processing Previous Question Paper

Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (ECE) (Sem.?5)
SPEECH AND AUDIO PROCESSING
Subject Code : BTEC-905E-18
M.Code : 78711
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1)
Define spectrogram? Explain why wideband spectrograms show periodicity in time?
2)
Define Linear Predictive Coding (LPC).
3)
What are the main differences between speech coding standard ITU-T G.726 and G.728
and G.729?
4)
Define moving average prediction.
5)
Define the term liftering, quefrency and cepstrum.
6)
Why LPC transformation is required? Write the names of major types of LPC
transformation.
7)
Write the expression of logarithm quantizer and its advantages over uniform quantizer.
8)
Write any two types of time domain pitch detection algorithms (PDAs) and their key
features.
9)
What is Waveform approximating speech coding technique?
10) What is the difference between Codebook Excitation and self-excitation?
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SECTION-B
11) With the help of suitable diagrams, explain in detail the Human Auditory System.
12) How linear predictive coding used in speech production. Explain in detail the Covariance
methods for LPC analysis.
13) Explain how pitch is estimated using cesptrum analysis?
14) Explain following Excitation codebook search method:
a) State-save method
b) Zero input zero output method
15) Explain levinson-Durbin algorithm for calculation of prediction coefficients.
SECTION-C
16) With the help of proper block diagram and mathematical expressions, explain forward
and backward adaptive quantizer.
17) How is code book generated for CELP? What are the limitations of CELP? What are the
modifications suggested in the basic CELP coder?
18) Explain LPC to LSF and LSF to LPC Transformation in detail with proper mathematical
expressions.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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