Data communication

1. Analog
Transmission
DAFFODIL INTERNATIONAL UNIVERSITY
PRESENTED BY TEAM NIGHTQUEEN QUIST

2. TEAM : NIGHTQUEEN QUIST
Team-members :
Fuad Hasan
221-15-5645
MD.Shahin Miah
221-15-5646
Tasnim Jarin
Labonno
221-15-5823
Shahriar Hossain
Shoikot
221-15-5208
Atikul Islam Onik
221-15-5384

3. Presentation
Overview
THINGS WE'LL COVER
• Analog Transmission
• Digital-to-analog conversion
• Analog-to-analog modulation

4. WHAT IS ANALOG TRANSMISSION?
ANALOG
TRANSMISSION

5. transmission is a transmission method of conveying voice, data, image, signal or video information using a continuous signal which varies in amplitude, phase, or some other property in
ion to that of a variable. It could be the transfer of an analog source signal, using an analog modulation method such as Frequency modulation or Amplitude modulation, or no modulation at
me textbooks also consider passband data transmission using a digital modulation methods such as ASK, PSK and QAM, i.e. a sinewave modulated by a digital bit-stream, as analog
ssion and as an analog signal. Others define that as digital transmission and as a digital signal. Baseband data transmission using line codes, resulting in a pulse train, are always considered
al transmission, although the source signal may be a digitized analog signal.
Analog transmission is a transmission method of conveying voice, data, image, signal or
video information using a continuous signal which varies in amplitude, phase, or some
other property in proportion to that of a variable. It could be the transfer of an analog source
signal, using an analog modulation method such as Frequency modulation or Amplitude
modulation, or no modulation at all. Some textbooks also consider passband data
transmission using a digital modulation methods such as ASK, PSK and QAM, i.e. a
sinewave modulated by a digital bit-stream, as analog transmission and as an analog
signal. Others define that as digital transmission and as a digital signal. Baseband data
transmission using line codes, resulting in a pulse train, are always considered as digital
transmission, although the source signal may be a digitized analog signal.
ANALOG
TRANSMISSION

6. Digital-to-analog conversion is the process of
changing one of the characteristics
signal based on the information in
of an
digital
analog
data.
DIGITAL-TO-ANALOG CONVERSION

7. Phase Shift Keying (PSK)
When a new binary symbol is
encountered, the phase of the signal
is altered.
frequencies, f1
uses two
and f2.
Frequency Shift Keying (FSK)
This technique
is held;
otherwise it is set to 0.
Amplitude Shift Keying(ASK)
When binary data represents digit
1, the amplitude
TYPES OF DIGITAL-
TO-ANALOG
There are FOUR types of modulation
Frequency Shift Keying (FSK)
This technique uses two frequencies,
f1 and f2.

8. •
• BANDWIDTH FOR ASK:
BASK OR OOK (ON-OFF KEYING)
B = (1 + D) × S
MODULATION OF DIGITAL DATA: ASK

9. MODULATION OF DIGITAL DATA: BINARY FSK
BANDWIDTH FOR ASK: B = (1 + D) X S + 2ΔF

10. • BANDWIDTH : THE
• LESS THAN THAT
SAME AS BASK, B = (1 + D) X S
FOR BFSK
MODULATION OF DIGITAL DATA: PSK

11. MODULATION OF
DIGITAL DATA: QAM
AMPLITUDE MODULATION
• QUADRATURE
• COMBINATION
• BANDWIDTH :
OF ASK AND
THE SAME AS
PSK
THAT REQUIRED FOR ASK
AND PSK

12. ANALOG-TO-ANALOG MODULATION

13. Amplitude Modulation
AM is normally implemented
by using a simple
multiplier
Frequency Modulation
FM is normally implemented by
using a voltage-controlled
oscillator
Phase Modulation
Phase modulation is
practically similar to
Frequency Modulation
ANALOG-TO-ANALOG

14. Amplitude Modulation

15. Frequency Modulation

16. Phase Modulation

17. Have You Any
Question?
FEEL FREE TO ASK.