PCM encoding

Anonymous
timer Asked: Mar 7th, 2019
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Question Description

hi, I did experiments# 14 and 18. I only want you to write the objectives of the labs, answers the questions , and write conclusion. thanks

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Procedure: 

PART A:

- Ensure that the power NO ELEVIs II power switch off 

- Plug the Emona DATEx expermintal add-in module into the NI ELVIS II

- Set the mode to PC 

- Turn on the NI ELVIS II on and connect it computer by USB

- Launch the software 

- Launch and run the NI ELVIS II function Generator VI

- Adjust the function generator for 10KHz(figure 1)


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Tutor Answer

jackmiller1
School: Cornell University

lab 18

1
Running header: FUNDAMENTALS OF COMMUNICATION LAB 18

Lab 18 fundamentals of communication

(Student’s name)
Institution affiliation)
(Instructor)
(Date)

2
FUNDAMENTALS OF COMMUNICATION LAB 18
Fundamentals of communication Lab 18
Introduction
This is an experiment on frequency shift keying. As opposed to other methods of sharing
channels FSK is commonly used because of its noise immunity.
Materials
The materials to be used in this experiment include; a personal computer, NI ELVIS II
with a USB cable and a power supply, Emona DATEx software, two 2mm BNC banana plugs,
and two banana latch leads.
Procedure
Power off NI ELVIS II and carefully plug in Emona DATEx. I then turned ON the
experimental switch on the DATEx module and later connected NI ELVIS II to the PC via a
USB cable. Afterwards, I switched on the PC and left it to boot up before commencing to the
experiment.
Results
The frequency was adjusted to 10 kHz

Fig 1

3
FUNDAMENTALS OF COMMUNICATION LAB 18
The connections were then modified as shown in fig 2

Fig 2
After making the connection above CH 1 input of the scope was activated to view FSK
signal out of the VCO while the scope’s time base was set to 500us/div.

Fig 3
Question 1
Mark frequency
Question 2
Space-frequency
Question 3
Mark frequency is always higher than space frequency; this is because of the change in voltages.

4
FUNDAMENTALS OF COMMUNICATION LAB 18
PART B
This part involves demodulation of an FSK signal using filtering and an envelope detector.
The connection was modified as shown below

Fig 4
The results on fig 5 as a result of slowly adjusting the low pass filter module soft Gain
control anticlockwise. The adjustment continued to point out that the high mark frequency
reduced to zero.

Fig 5
The initial connection was further modified as indicated on fig 6

5
FUNDAMENTALS OF COMMUNICATION LAB 18

Fig 6
Question 4
The carrier signal
Question 5
The message is a rectangularly shaped wave as shown in fig 7

Fig 7
Question 6
An envelope detector can be used to recover the digital signal.
PART C
The variable power supply was adjusted to a positive ou...

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Anonymous
Excellent job

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