Data communication (Unit2 : Signal conversions:)

on

Unit 2

Signal conversions: 

digital-to-digital conversion,

digital-to-analog conversion,

analog to digital conversion,

analog-to-analog conversion in detail,

Basics of Image and Video Compression



Unit 2 : Digital Transmission
  • digital to digital conversion
  • Line Coding
    1. characteristic
            

                2. Data Rate v/s signal Rate
           3. bandwidth
           4. baseline winding
           5. DC components
           6. Self synchronisation
                    7.built in error detection 
                    8.Immune to noise and interference
                    9. complexity
2.1.2 line coding schemas
1 .unipolar schemas 
    • nrz (non return to zero)
2. polar schema
  •  polar schema
    • nrz (non return to zero) 
3.bipolar schema
  • AMI and Pseudoternary
    • advantages and drawbacks


2.1.4 Scrombling

2.2 Analog to Digital Conversion 

2.2.1pulse and modulation
  • Sampling 

    • Idel Sampling
Quantization 
Quantization Level

Quantization Error:

uniform vs non uniform Quantization

Encoding,companding
original signal recovery
2.2.2Delta modulation(DM):

Modulation :
        At staircase
        demodulator


DM demodulator
 DM demodulator Components
2.3 Digital to Analog Conversion 
2.3.1 Amplitude shift keying (ASK)

Binary ASK(BASK)
2.3.2 Frequency shift keying (FSK)

    Binary FSK(BPSK)
2.3.4 Phase shift keying (PSK)
Binary PSK(BPSK)
Quadrature PSK (QPSK)
Constallation Diagram
2.35 Quadrature Amplitude Modulation(QAM)
2.4 .Analog to Analog conversion
2.4.1 Amplitude Modulation(AM)

2.4.2 Frequency Allocation(FM)
2.4.3 Phase Modulation(PM)
2
4.Multi Level Schemes
5. Multi Transmission 
        Block Coding
        4B/5B  Encoding

8B/10B
Eight Binary / 10Binary
In pm 


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