DCS-B: Basic Digital Communication Training System

Sampling clock

Frequency                                         : 2KHz, 4KHz, 8KHz, 16KHz,32KHz, 64KHz, 128KHz
Dutycycle                                           : 10 ~ 90%Selectable in steps of 10%
DCsignal                                             : 0 ~ 5V
Transmitterclock frequency         : 240KHz fast modes
Transmitterframe frequency        : 8KHz      
Carriersine waves                            : 500KHz (00 ), 1MHz(00), 1MHz (1800)
Datapattern                                       : 8-bit variableNRZ-L pattern
PRBS generator                                : 14-Bi

Transmitter section

Analog signal sampling
Sample and Hold
Natural sampling
Flat-top sampling
4channel analog time division multiplexing
Odd,Even parity and Hamming code generator
Pulsecode modulation
Dataencoding NRZ (L), NRZ (M), NRZ(S), Bi-phase (Manchester), Bi-phase (Mark),Bi-phase (Space),
URZ,Alternate Mark Inversion (AMI), Uni-polar to Bipolar and Bipolar to Uni-polaro  ASK,FSK, PSK modulation.
 Delta/ Adaptive delta / Sigma delta / CVSD modulation.
Signalcompression.
PAM/ PPM / PWM modulation
Audio preamplifier with microphone interface

Receiver section

2nd order and 4th order low pass Butterworth filters.
4channel time division de-multiplexing.
PLLclock recovery.
Odd,even parity and hamming code recovery
Single-bit error detection and correction.
Pulsecode demodulation
Datadecoding NRZ(L), NRZ(M), NRZ(S), Bi-phase (Manchester), Bi-phase (Mark),Bi-phase (Space),
URZ,alternate mark inversion (AMI)
ASK,FSK, PSK demodulation.
Delta/ adaptive delta / sigma delta / CVSD demodulation.
Signalexpander.
PAM/ PPM / PWM demodulation.
 Audio amplifier with headphone / speaker interface.

Study of sampling techniques

Natural sampling
Sample and hold
Flat top sampling

Effect of various sampling frequencies and duty cycles

Effectof sampling frequency
 Effectof duty cycle

Effect of order of the low pass filter

Study of TDM with different receiver synchronization techniques

Usingthe direct synchronization technique
Clockrecovery through PLI
Clockrecovery through threshold detector

Study of pulse code modulation and demodulation

Direct synchronization technique
Bit synchronization technique
Framesynchronization technique

Effects of parities and hamming code on PCM data

None parity
Even parity
Odd parity
Hammingcode

Study of PRBS

Study of various data encoding and decoding techniques

NRZ-L, NRZ- M, NRZ- S. BIO- L. BlO- M, BIO- S. URZ
AMIencoding and decoding
Unipolar to Bipolar
Bipolarto unipolar

Study of various carrier modulation and demodulation techniques

ASK modulation and demodulation

FSK modulation and demodulation.

PSK modulation and demodulation.

Study of delta modulation and demodulation.

Study of slope overload and increased integrator gain.

Study of adaptive delta modulation and demodulation.

Study of sigma delta modulation and demodulation.

Study of continuously variable slope detector modulation and demodulation.

Study of companding system.

Study of pulse width modulation and demodulation.

Study of pulse position modulation and demodulation.

Voice communication.

Switch faults.