Digital Communication Trainer.

TECHNICAL PARAMETERS

（1）AC/DC Power Supply

Input: AC  220V±10%

Output: DC ＋5V/3A，＋12V/1A，－12V/0.5A

（2）DDS Analog signal source

The type, frequency, amplitude of the output waveform and the duty cycle of the square wave of the DDS analog signal source are all adjustable.

The output frequency range of the sine wave is 1Hz ~ 200KHz, and the amplitude range is 200mV ~ 4V.

The output frequency range of the triangular wave is 1Hz ~ 20KHz, and the amplitude range is 200mV ~ 4V.

The output frequency range of the sawtooth wave is 1Hz～20KHz, and the amplitude range is 200mV～4V.

The output frequency range of Square Wave A is 1Hz～50KHz, the amplitude range is 200mV～4V, and the duty cycle remains unchanged at 50%.

The output frequency range of Square Wave B is 1Hz～20KHz, the amplitude range is 200mV～4V, and the duty cycle is adjustable in 5% steps.

Frequency output accuracy: ≤±5%.

（3）Analog signal source

Analog voice source: With voice input and output functions, to be used with a microphone-equipped headset;

Fixed-frequency sine wave output:

1KHz sine fundamental wave: peak-to-peak value is 1V±0.3V;

2KHz sine fundamental wave: amplitude range is adjustable from 200mV to 5V;

192KHz sine carrier wave: peak-to-peak value is 3.6V±0.3V;384KHz sine carrier wave: amplitude range is adjustable from 250mV to 5V;

（4）Digital signal source

Square wave duty cycle: 50%;

24.576M: 24.576MHz clock signal;

2048K: 2048KHz square wave output;

64K: 64KHz square wave output;

32K: 32KHz square wave output;

8K: 8KHz square wave output;

NRZ: Outputs 24-bit NRZ code. The code rate is determined by the "Code Rate Selection" DIP switch, and the code pattern is set via the "NRZ Code Pattern Selection" DIP switch;

BS: Outputs bit synchronization signal. The square wave frequency can be changed using the "Code Rate Selection" DIP switch;

2BS: Outputs square wave with a frequency twice that of the bit synchronization signal. The frequency can be adjusted via the "Code Rate Selection" DIP switch;

FS: Outputs frame synchronization signal, which is a narrow pulse. A frame consists of 24 bits, with a duty cycle of 1/48;

PN15: Outputs m-sequence with N=15. The code rate is determined by the "Code Rate Selection" DIP switch;

PN31: Outputs m-sequence with N=31. The code rate is determined by the "Code Rate Selection" DIP switch;

PN511: Outputs m-sequence with N=511. The code rate is determined by the "Code Rate Selection" DIP switch;

(1) Experimental box size: 540mm×380mm×130mm

EXPERIMENT ITEM

Tool module

(1)   Signal Source Module

1)   DDS Analog signal source

2)   Digital signal source

3)   Sine wave fixed-frequency signal source

4)   Analog voice source

Analog Signal Digitalization and Time Division Multiplex

(2)  Sampling Theorem (PAM) Experiment (Analog Signal Digitization Module)

(3)  Pulse Encoding Modulation and Demodulation Experiment PCM (Analog Signal Digitization Module)

(4) Continuous Variable Slope Delta (CVSD) Modulation and Demodulation Experiment (Analog Signal Digitization Module)

(5) Time Division Multiplexing (TDM) Experiment (Analog Signal Digitization Module, Multiplexing Module)

Common Code Patterns of Base Band Transmission

Code Pattern Transformation Experiment (Code Pattern Transformation Module)

Binary Digial Modulation

(7) 2ASK Modulation and Demodulation Experiment (Digital Modulation Module, Digital Demodulation Module)

(8) 2FSK Modulation and Demodulation Experiment (Digital Modulation, Digital Demodulation Module)

(9) 2PSK Modulation and Demodulation Experiment (Digital Modulation, Digital Demodulation Module)

(10) DPSK Modulation and Demodulation Experiment (Digital Modulation, Digital Demodulation Module)

Synchronization

(11) Synchronization Carrier Extraction Experiment (Frequency band Synchronization Extraction Module)

(12) Symbol Synchronization Signal Extraction Experiment (Baseband Synchronization Extraction Module/Frequency band Synchronization Extraction Module)

(13) Frame Synchronization Signal Extraction Experiment (Baseband Synchronization Extraction Module/Frequency band Synchronization Extraction Module)