Exercise 2
Name _____________ Pts __/16
- (1 pt) What is the frequency of a signal consisting of waves with a period
of 1/100 second?
- (1 pt) What is the period of the waves for a 1000 Hz. signal?
- (2 pt) a) The diagram presents a signal for one second, what is the signal
frequency?
b) What is the period of one wave?
- (2 pts) a) What type of modulation is used in the signal below?
b) What is a
reasonable the binary value corresponding to the signal?
- (3 pt) a) Assume that the graph for Question 3 represents one second of a
transmitted signal. According to Nyquist, what is the minimum number of times
it must be sampled to correctly ?
b) Assume that the graph for Question 4 represents one second of a
transmitted signal. According to Nyquist, what is the minimum number of times
it must be sampled to correctly ?
- (1 pt) Sampling every 1 millisecond produces 1000 samples per second. A
noiseless 4 kHz channel is sampled every 1 millisecond. What is the maximum
data rate of a 4-level signal?
- (3 pt) A modem constellation diagram similar to Fig 2-25
(a) of the text has data points at the following coordinates: (3,3), (3,-3),
(-3,3), and (-3,-3).
a) Accurately
display the points on the diagram below.
b) How
many bps can a modem with these parameters achieve at 4800 baud?
c) A modem
constellation diagram has data points at (0,3) and (0, 4). Does the modem
use phase modulation or amplitude modulation?
- (1 pt) Why has the PCM sampling time been set at 125 microseconds?
- (1 pt) What is the source of the delay introduced by a
time switch interchanger?
- (2 pts) We want to transmit an 8 by 10 inch image by
facsimile over an ISDN B channel. The facsimile machine digitizes the image
into 300 pixels per inch (both horizontal and vertical) and assigns 4 bits per
pixel.
a) How many bits
are to be transmitted?
b) How long will
it take on a B channel?
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