DCS-B: Basic Digital Communication Training System

Clock and signal generation section
1) Sine wave
i) Fixed frequency : 250Hz, 500Hz, 1 KHz, 2 KHz
ii) Variable frequency : 1Hz ~ 30Hz

2) Sampling clock
i) Frequency : 2 KHz, 4 KHz, 8 KHz, 16 KHz, 32 KHz, 64 KHz, 128 KHz
ii) Duty cycle : 10 ~ 90% Selectable in steps of 10%
iii) DC signal (DC1 & DC2) : 0 ~ 3.3 V
iv) Transmitter clock frequency : 240 KHz fast modes
v) Transmitter frame frequency : 8 KHz
vi) Carrier sine wave : 500 KHz(0⁰), 1MHz(0⁰), 1MHz(180⁰)
vii) Data pattern : 8-bit NRZ-L pattern and 14-bit PRBS data

3) Transmitter section
i) Analog signal sampling (sample & hold, natural, flat-top)4 channel analog time division multiplexing
ii) Odd, even parity and hamming code generator, PCMASK, FSK, PSK modulation
iii) Data encoding NRZ (L), NRZ (M), NRZ(S), Bi-phase (Manchester/Mark/Space), URZ, alternate mark inversion (AMI), uni-polar to bipolar and bipolar to uni-polar
iv) Advanced Modulation : Delta, Adaptive Delta, Sigma Delta, CVSD, PAM, PPM, PWM and signal compression.
v) Audio preamplifier with microphone interface

4) Receiver section
i) 2ⁿᵈ order and 4ᵗʰ order low pass butterworth filters
ii) 4 channel time division de-multiplexing
iii) LL clock recovery Pulse code demodulation & Signal expander
iv) Data decoding NRZ(L), NRZ(M), NRZ(S), Bi-phase (Manchester/Mark/Space), URZ, AMI
v) ASK, FSK, PSK, PAM / PPM / PWM demodulation
vi) Delta / adaptive delta / sigma delta / CVSD demodulation
vii) Audio amplifier with headphone with mic interface
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1) Study of sampling techniques Sample & hold, natural,  flat-top sampling
i) Effect of various sampling frequencies and duty cycles
ii) Effect of sampling frequency, Effect of duty cycle

2) Study of TDM with different receiver synchronization  techniques
i) Using the direct synchronization technique
ii) Clock recovery through PLL / threshold detector

3) Study of pulse code modulation and demodulation
i) Direct, Bit and Frame synchronization technique

4) Effects of parities and hamming code on PCM data
i) None, Even, Odd Parity, Hamming code Study of PRBS

5) Study of various data encoding and decoding  techniques
i) NRZ- L, NRZ- M, NRZ- S, BIO-L, BIO-M, BIO-S, URZAMI encoding and decoding
ii) Unipolar to bipolarBipolar to unipolar

6) Study of various carrier mod and demod techniques
i) ASK , FSK, PSK modulation and demodulation
ii) Study of delta modulation and demodulation
iii) Study of slope overload and increased integrator gain
iv) Study of adaptive & Sigma delta modulation and demodulation
v) Study of continuously variable slope detector modulation and demodulation
vi) Study of companding system Study of PWM & PPM modulation and demodulation
vii) Switch faults
viii) Voice communication
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