Scientech 2800 Series
Understanding Digital Communication Principles


Understanding Digital Communication Principles

Scientech TechBooks are compact and user friendly learning platforms to provide a modern, portable, comprehensive and practical way to learn Technology. Each TechBook is provided with detailed Multimedia learning material which covers basic theory, step by step procedure to conduct the experiment and other useful information.

Besides Standard Functions Sine, Square, Triangle, Ramp it also provides various signals ASK, FSK, PWM and 8 Bit Pattern Generator.

The digital revolution has resulted in many digital communication applications where the principles of data transmission are applied. These portable learning platform series provides a modern, Comprehensive and practical subject content of the field of digital communication.

Using extensive hands on practice on different topics covered in these handy self contained TechBooks, students can understand the subject in a better way.

Scope of Learning

PAM, PPM, PWM and Line Coding Techniques
Scientech 2801

Pulse Amplitude Modulation & De-modulation

  • Study and analysis of pulse Amplitude Modulation.
  • Study and analysis of Nyquist Sampling Rate.
  • Study and analysis of Natural Sampling with different types of message signals at different frequencies.
  • Study and analysis of Flat top Sampling with different types of message signals at different frequencies.
  • Study and analysis of Sample & Hold output with different types of message signals at different frequencies.
  • Study and analysis of under sampling by varying the message frequency and sampling rate.
  • Study and analysis of Second order Low Pass Butterworth filter.
  • Study and analysis of Pulse Amplitude Demodulation of Sample & Hold output with Second Order Low Pass Butterworth filter.
  • Analyze all these Natural sampling, Flat top sampling and Sample & Hold output simultaneously and observe the difference.
Delta, Adaptive Delta, Sigma Delta Modulator & Demodulator
Scientech 2803

Delta Modulator & Demodulator

  • Study and analysis of Delta Modulation and Demodulation.
  • Study and analysis of Sample & Hold output by varying the Sampling as well as Signal frequency.
  • Study and analysis of Integrator output at the Modulator by varying the Sampling frequency.
  • Study and analyze the improved Integrator output by varying the gain control frequency.
  • Study and analysis of the Slope Overload distortion problem.
  • Study and analysis of the Granular Noise problem.
  • Study and analysis of single bit Delta modulated PCM output.
  • Study and analysis of Integrator output at the Demodulator.
  • Analyze the final Delta demodulated output with Second order Low Pass Butterworth filter.
Digital Companding A-Law and µ-Law
Scientech 2805

A-Law and µ-Law Companding

  • Study and analysis of A-law Compression.
  • Study and analysis of µ-law Compression.
  • Study and analysis of A-law Decompression.
  • Study and analysis of µ-law Decompression.
ASK, FSK, BPSK, DBPSK Modulator & Demodulator
Scientech 2807

Amplitude Shift Keying Modulation & Demodulation

Objectives:
  • Study and analysis of of Amplitude Shift Keying Modulation.
  • Study and analysis of Amplitude Shift Keying Demodulation.
  • Study and analysis of Integrator and Comparator block.

Frequency Shift Keying Modulation & Demodulation

Objectives:
  • Study and analysis of Frequency Shift Keying Modulation.
  • Study and analysis of Frequency Shift Keying Demodulation.
  • Study and analysis of Integrator and Comparator block.

Binary Phase Shift Keying Modulation & Demodulation

Objectives:
  • Study and analysis of Binary Phase Shift Keying Modulation.
  • Study and analysis of Binary Phase Shift Keying Demodulation.
  • Study and analysis of Integrator and Comparator block.

Differential Binary Phase Shift Keying Modulation & Demodulation

Objectives:
  • Study and analysis of Differential encoder and decoder.
  • Study and analysis of Differential Binary Phase Shift Keying Modulation.
  • Study and analysis of Differential Binary Phase Shift Keying Demodulation.
PCM, DPCM, CVSD Modulator & Demodulator
Scientech 2802
  • Study and analysis of Pulse Code Modulation.
  • Study and analysis of Sample & Hold output by varying the Sampling as well as Signal frequency.
  • Study and analysis of Parallel to Serial conversion by varying the Line speed clock.
  • Study and analysis of single bit PCM output at different Line speed clock.
  • Study and analysis of Pulse Code Demodulation.
  • Study and analysis of Serial to Parallel conversion.
  • Analyze the final PCM demodulated output with Second Order Low Pass Butterworth filter.
4-Channel TDM-PCM Transmitter & Receiver
Scientech 2804

Time Division Multiplexing & Demultiplexing with Pulse Code Modulation

  • Study and analysis of 2 channel & 4 channel Time Division Multiplexing
  • Study and analysis of Sample & Hold output at different channel by varying the Sampling as well as Signal frequency.
  • Study and analysis of Parallel to Serial conversion by varying the line speed clock at the different channel.
  • Study and analysis of single bit PCM output at different line speed clock at the different channels.
  • Study and analysis of single bit multiplexed PCM output at Modulator side.
  • Study and analysis of single bit demultiplexed PCM output at Demodulator side.
  • Study and analysis of Pulse Code Demodulation at the different channel.
  • Study and analysis of Serial to Parallel conversion at the Demodulator.
  • Analyze the final demodulated output with Second order Low Pass Butterworth filter.
Understanding Noise Generator and its applications
Scientech 2806
  • Study of different types of Noise and their frequency spectrum
    • White Noise
    • Additive White Gaussian Noise
    • Pseudo Random Noise
  • Practical implementation of mathematical equation :
    • y(t) = x(t) + n(t)
  • Study and analysis of Signal to Noise ratio-
    • By varying Noise amplitude
    • By varying Signal amplitude
  • Study and analysis of eye pattern with and without Noise.
QPSK, OQPSK, DQPSK Modulator & Demodulator
Scientech 2808

Quadrature Phase Shift Keying Modulation and Demodulation

Objectives:
  • Study and analysis of QPSK Modulation and Demodulation with variable bit pattern and frequency.
  • Study and analysis of 2 bit encoding as I-Channel & Q-Channel encoding and decoding.
  • Study and analysis of Integrator and Comparator at the Demodulator end.

Offset Quadrature Phase Shift Keying Modulation and Demodulation.

Objectives:
  • Study and analysis of OQPSK Modulation and Demodulation with variable bit pattern and frequency.
  • Study and analysis of 2 bit encoding as I- Channel & Q-Channel encoding and decoding.
  • Study and analysis of offset encoding and decoding.
  • Study and analysis of Integrator and Comparator at the Demodulator end.

Diffrential Quadrature Phase Shift Keying Modulation and Demodulation.

Objectives:
  • Study and analysis of DQPSK Modulation and Demodulation with variable bit pattern and frequency.
  • Study and analysis of 2 bit encoding as I-Channel & Q-Channel encoding and decoding.
  • Study and analysis of differential encoding and decoding.
  • Study and analysis of Integrator and Comparator at the Demodulator end.

Product Video

Technical Specification

Technical Specifications 2801 2802 2803 2804 2805 2806 2807 2808
Techniques:
PAM, PPM, PWM. Line Coding   - - - - - - -
PCM, DPCM, CVSD -   - - - - - -
Delta, Adaptive Delta, Sigma Delta First & Second Order Modulator - -   - - - - -
TDM- PCM 2-Channel & 4-Channel - - -   - - - -
Digital Companding A-Law, μ-Law - - - -   - - -
Understanding Noise Generator and its applications - - - - -   - -
ASK, FSK, BPSK, DBPSK - - - - - -   -
QPSK, OQPSK, DQPSK - - - - - - -  
 
Internal Signal Generator : Direct Digital Synthesizer                
Types of Signal :
Sine                
Cosine - - - - - - -  
Square       - -   - -
Triangle         -   - -
Arbitrary Signal         -   - -
Variable Frequency         -   - -
Internal Data Pattern Generator : 8 Bit/ 16 Bit/ 32 Bit/64 Bit   - - - - -    
Data Pattern Frequency - - - - - -    
Sampling/Ramp Frequencies         - - - -
Line Speed -   - - - - - -
Input through DIP switch - - - -   - - -
 
External Signal
Maximum Input Voltage : 3Vpp (Max.) +1.5V DC offset       - - - - -
Frequency : 500Hz to 3.5KHz       - - - - -
 
SMD LED Indicators                
Crystal Frequency 20MHz 8MHz 8MHz 8MHz 8MHz 8MHz 8MHz 8MHz
Selection Mode : Push switches / Toggle switches                
 
Transmission Effect: Attenuation, Noise, Filter -     - - - - -
Low Pass Filter         - - - -
Digital Filter : Decimation filter (16:1) - -   - - - - -
Gain Selection for Modulating Signal - - - - -   - -
Gain Selection for Noise - - - - -   - -
 
Test Points 29 38 46 40 37 5 39 57
Learning Material                
Dimensions (mm) : W 326 x D 252 x H 52                
Power Supply : 110V - 260V AC, 50/60Hz                
Weight : 1.5Kg (Approximately)                
Operating Condition : 0-40 C, 85% RH                
Included Contents : 2mm Patch cord - 2nos