Amplitude Modulation PPT Physics Class 12

 Page 1


PRINCIPLES OF COMMUNICATION
1. BASICS OF COMMUNICATION
2. AMPLITUDE MODULATION
Page 2


PRINCIPLES OF COMMUNICATION
1. BASICS OF COMMUNICATION
2. AMPLITUDE MODULATION
BASICS OF COMMUNICATION
1. Communication:  Processing, sending and receiving of information
2. Information:  Intelligence, signal, data or any measurable physical quantity
3. Basic Communication System:
Source of 
information
Transmitter
Link
Receiver
Destination
i) Speech           
ii) Pictures                     
iii) Words                  
iv) Codes                     
v) Symbols                 
vi) Commands 
vii) Data
i) Oscillators  ii) Amplifiers     
iii) Filters  iv) Antenna
i) Wire Links                
ii) Wireless                 
iii) Optic Fibres
i) Radio  ii) TV  iii) Computer  iv) Telephone                      
v) Teleprinter  vi) Telegraph vii) Fax viii) Internet  
Page 3


PRINCIPLES OF COMMUNICATION
1. BASICS OF COMMUNICATION
2. AMPLITUDE MODULATION
BASICS OF COMMUNICATION
1. Communication:  Processing, sending and receiving of information
2. Information:  Intelligence, signal, data or any measurable physical quantity
3. Basic Communication System:
Source of 
information
Transmitter
Link
Receiver
Destination
i) Speech           
ii) Pictures                     
iii) Words                  
iv) Codes                     
v) Symbols                 
vi) Commands 
vii) Data
i) Oscillators  ii) Amplifiers     
iii) Filters  iv) Antenna
i) Wire Links                
ii) Wireless                 
iii) Optic Fibres
i) Radio  ii) TV  iii) Computer  iv) Telephone                      
v) Teleprinter  vi) Telegraph vii) Fax viii) Internet  
Forms of Communication: Types of communication:
1. Radio Broadcast
2.    Television Broadcast
3.    Telephony
4.    Telegraphy
5. Radar
6. Sonar
7. Fax (Facsimile Telegraphy)
8. E-mail
9. Teleprinting
10. Telemetering
11. Mobile Phones
12. Internet
1. Cable 
communication
2. Ground wave 
communication
3. Sky wave 
communication
4. Satellite 
communication
5. Optic fibre 
communication
Page 4


PRINCIPLES OF COMMUNICATION
1. BASICS OF COMMUNICATION
2. AMPLITUDE MODULATION
BASICS OF COMMUNICATION
1. Communication:  Processing, sending and receiving of information
2. Information:  Intelligence, signal, data or any measurable physical quantity
3. Basic Communication System:
Source of 
information
Transmitter
Link
Receiver
Destination
i) Speech           
ii) Pictures                     
iii) Words                  
iv) Codes                     
v) Symbols                 
vi) Commands 
vii) Data
i) Oscillators  ii) Amplifiers     
iii) Filters  iv) Antenna
i) Wire Links                
ii) Wireless                 
iii) Optic Fibres
i) Radio  ii) TV  iii) Computer  iv) Telephone                      
v) Teleprinter  vi) Telegraph vii) Fax viii) Internet  
Forms of Communication: Types of communication:
1. Radio Broadcast
2.    Television Broadcast
3.    Telephony
4.    Telegraphy
5. Radar
6. Sonar
7. Fax (Facsimile Telegraphy)
8. E-mail
9. Teleprinting
10. Telemetering
11. Mobile Phones
12. Internet
1. Cable 
communication
2. Ground wave 
communication
3. Sky wave 
communication
4. Satellite 
communication
5. Optic fibre 
communication
Analogue signal
A continuous signal value which 
at any instant lies within the 
range of a maximum and a 
minimum value.
A discontinuous signal value 
which appears in steps in pre-
determined levels rather than 
having the continuous change.
Digital signal
0 t
V
1 0 1  0 1 0 1 0 1
T/4    T/2    3T/4    T    5T/4  3T/2   7T/4  2T
t
0
p 2 p 3 p 4 p p/2 3 p/2 5 p/2 7 p/2 ? = ?t
E 
,I
E
0
I
0
E = E
0
sin ?t
I  = I
0
sin ?t
Page 5


PRINCIPLES OF COMMUNICATION
1. BASICS OF COMMUNICATION
2. AMPLITUDE MODULATION
BASICS OF COMMUNICATION
1. Communication:  Processing, sending and receiving of information
2. Information:  Intelligence, signal, data or any measurable physical quantity
3. Basic Communication System:
Source of 
information
Transmitter
Link
Receiver
Destination
i) Speech           
ii) Pictures                     
iii) Words                  
iv) Codes                     
v) Symbols                 
vi) Commands 
vii) Data
i) Oscillators  ii) Amplifiers     
iii) Filters  iv) Antenna
i) Wire Links                
ii) Wireless                 
iii) Optic Fibres
i) Radio  ii) TV  iii) Computer  iv) Telephone                      
v) Teleprinter  vi) Telegraph vii) Fax viii) Internet  
Forms of Communication: Types of communication:
1. Radio Broadcast
2.    Television Broadcast
3.    Telephony
4.    Telegraphy
5. Radar
6. Sonar
7. Fax (Facsimile Telegraphy)
8. E-mail
9. Teleprinting
10. Telemetering
11. Mobile Phones
12. Internet
1. Cable 
communication
2. Ground wave 
communication
3. Sky wave 
communication
4. Satellite 
communication
5. Optic fibre 
communication
Analogue signal
A continuous signal value which 
at any instant lies within the 
range of a maximum and a 
minimum value.
A discontinuous signal value 
which appears in steps in pre-
determined levels rather than 
having the continuous change.
Digital signal
0 t
V
1 0 1  0 1 0 1 0 1
T/4    T/2    3T/4    T    5T/4  3T/2   7T/4  2T
t
0
p 2 p 3 p 4 p p/2 3 p/2 5 p/2 7 p/2 ? = ?t
E 
,I
E
0
I
0
E = E
0
sin ?t
I  = I
0
sin ?t
MODULATION:
Types of Modulation:
1. Amplitude Modulation
2. Frequency Modulation
3. Pulse Modulation
4. Phase Modulation
Modulation is the process of variation of some characteristic 
of a high frequency wave (carrier wave) in accordance with the 
instantaneous value of a modulating signal.
Modulator
A.F. 
Signal Amp. 
Modulated 
Signal
H.F. Signal 
Oscillator