CMR Institute of Technology, Bangalore
Department(s): Electronics & Communication
Semester: 06 Section(s): A Lectures/week: 04
Subject: Multi Media Communications (MMC) Code: 21EC745
Course Instructor(s): Dr.Sharmila K.P
Assignment Submission Date – 31/03/2025 (Monday)
Assignment 1
Note: Attempt ODD/EVEN Questions as per your USN’s
S.no Question CO BL
1 What is multimedia? State the basic form of representation of text, an image, CO1 L2
audio and video. List different types of multimedia networks. Explain them
briefly.
2 With the help of a diagram, describe the main components of PSTN and CO1 L2
show how a high speed modem provides multiple services in addition to
basic telephony.
3 Explain the working principle of circuit-mode and packet-mode of operation CO1 L2
of multimedia networks. List out salient features of each type of networks.
4 Discuss the different types of the communication network that are used to CO1 L2
provide multimedia communication service.
5 With a neat diagram, explain how voice mail and teleconferencing is CO1 L2
supported in relation to speech only interpersonal communication involving
both public (PSTN/ISDN) and private network. Also, explain the role of
voice mail server and audio bridge.
6 Explain with neat diagrams, the interactive television application for both CO1 L2
cable and satellite network. Also explain briefly interactive applications over
the internet.
7 Derive the maximum block size that should be used over a channel which CO1 L2
has mean BER probability of 10-4 if the probability of a block containing an
error and hence being discarded is to be 10-1 .
8 Explain with the neat figures the multipoint conferencing modes and type of CO1 L2
conferencing.
9 Determine the Propagation delay associated with the communication CO2 L2
channels (i)A connection through a private telephone network of 1 km (ii)A
connection through a PSTN of 200 km(iii)A connection over a satellite
channel of 50,000 km. Assume that the velocity of propagation of a signal in
the case of (i) and (ii) is 2 x 108 m/s and in the case of (iii) is 3 x 108 m/s.
10 Explain the following: a) Network QoS parameters b) Application QoS CO1 L2
parameters.
11 Describe raster scan operation and interlaced scanning associated with TV/ CO2 L2
computer monitor with suitable diagrams.
12 Explain the principle of operation of PCM speech codec with a block CO2 L2
diagram. Also explain compressor and expander.
13 Explain the following: (i) Quantization intervals (ii) Quantization noise (iii) CO2 L2
Pixel Depth (iv) Aspect ratio (v) SIF (vi) CIF.
14 With a neat diagram explain audio/sound synthesizer. CO2 L2
15 An analog signal has a dynamic range of 40 dB. Find the magnitude of the CO2 L2
quantization noise relative to the minimum signal amplitude if the quantizer
uses (i) 5 bits (ii) 10 bits.
16 Assuming the bandwidth of a speech signal is from 50 Hz through to 10 kHz CO2 L2
and that of a music signal is from 15 Hz through to 20kHz, derive the bit rate
that is generated by the digitization procedure in each case assuming the
Nyquist sampling rate is used with 12 bits per sample for the speech signal
and 16 bits per sample for the music signal. Derive the memory required to
store a 10 minute passage of stereophonic music.
17 Calculate the time to transmit the following digitized images at both 64kbps CO2 L2
and 1.5mbp i) A 640 x 480 х 8 VGA- compatible image ii) A 1024 x 768 x
24 SVGA- compatible image.
18 Derive the bit rate and the memory requirements to store each frame that CO2 L2
results from the digitization of both a 525 line and 625 line systems,
assuming a 4:2:2 formats. Also find the total memory required to store a 2
hour movie/video.
19 Describe function of signal encoder with the associated waveforms CO2 L2
20 A message comprising of a string of characters with probabilities e = 0.3 n =
0.3 t = 0.2 w = 0.1 .=0.1 is to be encoded. The message is "went." Compute
the arithmetic codeword
21 Messages Comprising seven different characters, A through H, are to be CO2 L3
transferred over a data link. Analysis has shown that the relative frequency
of occurrence of each character is: A and B= 0.25, C and D = 0.14, E , F,G
and H= 0.055 (a) use Shanon’s formula to derive the minimum average
number of bits per character(b) Use static Huffman coding to derive a
suitable set of codewords by constructing Huffman code tree (c) (i) Derive
the entropy of the messages (ii) fixed length binary code words (iii) 7 bit
ASCII code words
22 Explain with the help of neat diagram how an image produced by a scanner CO1 L2
or digital camera is captured and stored with in computer memory.
23 What is lossless and lossy compression? Discuss about Run-length encoding CO1 L2
24 Explain (a) Differential encoding (b) Transform encoding CO1 L2
NOTE : All the 24 questions of the above assignment1 together form the question bank for
IAT1. They are covering Module1 ,Module2 and Module 3 up to L-Z coding
