This trainer adopts communication building blocks type modular frame, from the perspective of the communication system, each knowledge point is matched to a independent module, each module has the standard structure, signal input and output interface and clock bus, communication bus interface. The module design adopts the current more popular soft core and hard architecture open type design mode in the current communication device, not only can let the students configured the module function flexibly, but also can use these standard module building blocks to build the communication system according to their own concepts, such as the wire communication system, wireless communication system, band-limited transmission, programmed control switching system, mobile communication system, optic fiber transmission looped network, PSTN networks and so on, can let the students use these module building blocks to deep learn each knowledge point and all kinds of communication system before the stud
Specification:
Clock and signal generation section Sine wave Fixed frequency: 250Hz, 500Hz, 1 KHz, 2 Khz Variable frequency: 1Hz ~ 30Hz, 0 ~ 2 Vpp Sampling clock? Frequency : 2 KHz, 4 KHz, 8 KHz, 16 KHz,32 KHz, 64 KHz, 128 Khz Duty cycle : 10 ~ 90% Selectable in steps of 10% DC signal : 0 ~ 5 V Transmitter clock frequency :240 KHz fast modes Transmitter frame frequency :8 Khz Carrier sine waves : 500 KHz (00), 1MHz (00), 1MHz (1800) Data pattern : 8-bit variable NRZ-L pattern PRBS generator : 14-bit Transmitter Section Analog signal sampling ,Sample and hold, Natural sampling, Flat-top sampling 4 channel analog time division multiplexing Odd, even parity and hamming code generator Pulse code modulation ASK, FSK, PSK modulation Data encoding NRZ (L), NRZ (M), NRZ(S), Bi- phase(Manchester), Bi-phase (Mark), Biphase (Space), URZ, alternate mark inversion (AMI), uni-polar to bipolar and bipolar to uni-polar Delta / adaptive delta / sigma delta / CVSD modulation Signal compression PAM / PPM / PWM modulation Audio preamplifier with microphone interface Receiver section 2nd order and 4th order low pass Butterworth filters 4 channel time division de-multiplexing PLL clock recovery Pulse code demodulation Odd, even parity and hamming code recovery Single bit error detection and correction Data decoding NRZ(L), NRZ(M), NRZ(S), Biphase (Manchester), Bi-phase (Mark), Bi-phase (Space), URZ, alternate mark inversion (AMI) ASK, FSK, PSK demodulation Delta / adaptive delta / sigma delta / CVSD demodulation Signal expander PAM / PPM / PWM demodulation Audio amplifier with headphone / speaker interface Experiments: Study of sampling techniques Natural sampling, Sample and hold, Flat top sampling Effect of various sampling frequencies and duty cycles Effect of sampling frequency Effect of duty cycle Effect of order of the low pass filter Study of TDM with different receiver synchronization techniques Using the direct synchronization technique Clock recovery through PLI Clock recovery through threshold detector Study of pulse code modulation and demodulation Direct synchronization technique Bit synchronization technique Frame synchronization technique Effects of parities and hamming code on PCM data N o n e p a r i t y, E v e n p a r i t y, O d d p a r i t y ,Hamming code Study of PRBS Study of various data encoding and decoding techniques NRZ- L, NRZ- M, NRZ- S. 810-1. BlO-M, 810-S. URZ ? AMI encoding and decoding Unipolar to bipolar Bipolar to 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 compounding system Voice communication Study of pulse width modulation and demodulation. Study of pulse position modulation and demodulation Switch faults.
