1) Which among the following compression techniques is/are intended for still images?
a. JPEG
b. H.263
c. MPEG
d. All of the above

2) Which lossy method for audio compression is responsible for encoding the difference between two consecutive samples?
a. Silence Compression
b. Linear Predictive Coding (LPC)
c. Adaptive Differential Pulse Code modulation (ADPCM)
d. Code Excited Linear Predictor (CELP)
Answer
Explanation
Related Ques

ANSWER: Adaptive Differential Pulse Code modulation (ADPCM)
Explanation: No explanation is available for this question!


3) Which coding technique/s exhibit/s the usability of fixed length codes?
a. Lempel Ziv
b. Huffman
c. Both a and b
d. None of the above

4) Which among the following is used to construct the binary code that satisfies the prefix condition?
a. Information Rate
b. Noiseless Channel
c. Channel Coding Theorem
d. Kraft Inequality

5) Information rate basically gives an idea about the generated information per _____ by source.
a. Second
b. Minute
c. Hour
d. None of the above

6) Which approach plays a cardinal role in supporting the results obtained regarding the information capacity theorem?
a. Line Packing
b. Volume Packing
c. Sphere Packing
d. All of the above

7) In sphere packing, where is the received code vector with added noise located?
a. Inside the sphere
b. Outside the sphere
c. On the boundary (circumference) of sphere
d. All of the above

8) If a noiseless channel bandlimited to 5 kHz is sampled every 1msec, what will be the value of sampling frequency?
a. 250 samples/sec
b. 500 samples/sec
c. 800 samples/sec
d. 1000 samples/sec

9) Assuming that the channel is noiseless, if TV channels are 8 kHz wide with the bits/sample = 3Hz and signalling rate = 16 x 10^{6} samples/second, then what would be the value of data rate?
a. 16 Mbps
b. 24 Mbps
c. 48 Mbps
d. 64 Mbps

10) On which factor/s do/does the channel capacity depend/s in the communication system?
a. Bandwidth
b. Signal to Noise Ratio
c. Both a and b
d. None of the above

11) Which amount the following is capable of correcting any combination of three or fewer errors random errors in a block of 23 bits?
a. Hamming codes
b. Interleaved code
c. Repetition codes
d. Golay code

12) For a (6,4) block code where n = 6, k = 4 and d_{min} = 3, how many errors can be corrected by this code?
a. 0
b. 1
c. 2
d. 3

13) In Repetition Code, how many information bit/s is/are present in addition to n1 parity bits?
a. One
b. Two
c. Four
d. Eight

14) On which factor/s do/does the error probability depend/s after decoding?
a. Number of error vectors
b. Error probability of symbol transmission
c. Both a and b
d. None of the above

15) Which buffer size is required by the interleaved codes at the transmitter for the accumulation of λ code words?
a. Small
b. Medium
c. Large
d. All of the above

16) For the generation of a cyclic code, the generator polynomial should be the factor of _____
a. x^{n} + 1
b. x^{n} – 1
c. x^{n} /2
d. x^{2n/3}

17) Consider the assertions related to decoding process of cyclic code. Which among the following is a correct sequence of steps necessary for the correction of errors?
A. Syndrome determination after the division of r(x) & g(x) B. Addition of error pattern to received code word C. Selection of error pattern corresponding to the syndrome D. Preparation of table comprising error patterns and syndromes
a. A, B, C, D
b. B, A, D, C
c. C, B, D, A
d. D, A, C, B

18) Which among the below stated logical circuits are present in encoder and decoder used for the implementation of cyclic codes?
A. Shift Registers B. Modulo2 Adders C. Counters D. Multiplexers
a. A & B
b. C & D
c. A & C
d. B & D

19) Which among the following error detecting technique is supposed to be parity bit associated with character code?
a. LRC
b. VRC
c. Both a and b
d. None of the above

20) In register contents at decoder, the syndrome register consists of syndrome after all bits of received vector are clocked into the decoder ________.
a. Input
b. Output
c. Both a and b
d. None of the above

21) If the errors are corrected at _______end/s, it is known as 'Forward Error Correction' (FEC).
a. Transmitter
b. Receiver
c. Both a and b
d. None of the above

22) In Frame Check Sequence (FCS), which code is used if character length is 6 bit and generates 12 bit parity check bits?
a. CRC12
b. CRC16
c. CRC32
d. CRCCCITT

23) Decoding of RS code comprises the determination of error _______
A. position B. magnitude C. angle D. frequency
a. A & B
b. C & D
c. A & C
d. B & D

24) In RS code, the length is ____less than number of symbols in symbol set (q).
a. One
b. Two
c. Three
d. Infinite

25) In Minimum Distance Separable (MDS) codes, the minimum distance is one more than the number of _________.
a. Information bits
b. Symbol bits
c. Parity check bits
d. None of the above

26) In Trellis diagram, what do/does the horizontal axis represent/s?
a. Continuous time
b. Discrete time
c. Sampled time
d. All of the above

27) For the 4 states of an encoder on vertical axis of Trellis diagram, what do/does the solid line indicate/s?
a. '0' input
b. '1' input
c. Both a and b
d. None of the above

28) Which decoding method involves the evaluation by means of Fano Algorithm?
a. Maximum Likelihood Decoding
b. Sequential Decoding
c. Both a and b
d. None of the above

29) For a received sequence of 6 bits, which decoding mechanism deals with the selection of best correlated sequence especially by correlating the received sequence and all permissible sequences?
a. Soft Decision Decoding
b. Hard Decision Decoding
c. Both a and b
d. None of the above

30) To obtain the transfer function of a convolutional code, the splitting of allzero state takes place into ___
A. starting state B. first return to allzero state C. inbetween state
a. A & B
b. B & C
c. A & C
d. None of the above

31) The distance between each symbol in given sequence and reference sequence is known as _______.
a. Euclidean Distance
b. Distance between sequences
c. Manmattan Distance
d. Hamming Distance

32) d_{free} is defined as the Euclidean distance of coded signal in terms of _________ possible distance between all allowed sequences.
a. smallest
b. largest
c. average
d. constant

33) For designing trellis code, the emphasis must be on maximizing __________
a. Euclidean distance between code vectors
b. Hamming distance of error correcting codes
c. Both a and b
d. None of the above

34) For designing a communication system, which among the following parameters should be maximum?
A. Transmission rate B. Received signaltonoise ratio C. Error probability D. Bandwidth requirement
a. A & B
b. C & D
c. A & C
d. B & D

35) For fixed symbol rate, increase in bits/symbol ultimately improves r_{b}/B bits/s/Hz & hence, regarded as _____.
a. Power efficiency
b. Spectral efficiency
c. Transmission efficiency
d. Modulation eficiency
