To Study the Generation and Detection of Delta Modulation




Objective

Generation and detection of Delta Modulation.

Aim of the Experiment

To study the generation and detection of Delta Modulation.

Equipment Required

Delta Modulation and Demodulation Trainer Kit
Digital Storage Oscilloscope (100MHz, 1GSa/S)
Power supply
Probes
Patch cord
Connecting wires

Theory

Delta Modulation is a form of pulse modulation where a sample value is represented as a single bit. This is almost similar to differential PCM, as the transmitted bit is only one per sample just to indicate whether the present sample is larger or smaller than the previous one. The encoding, decoding and quantizing process become extremely simple but this system cannot handle rapidly varying samples. This increases the quantizing noise.

Procedure

The connections are given as per the block diagram.

2. Connect power supply in proper polarity to kits DCL-07 and switch it on.

3. Keep the Switch S2 in Delta position.

4. Keep the Switch S4 High.

5. Observe the various tests points in delta demodulator section and observe the reconstructed signal through 2nd order and 4th order filter.

Block Diagram / Circuit Diagram

Delta modulation circuit diagram

Graph

Delta modulation waveforms graph

Observation Table

Signal Amplitude Time period Frequency
Message Signal
Digital Sampler Output
Integrator-3 Output
Filter Output

Result

Delta Modulation and Demodulation are verified in the hardware kit and its waveforms are studied.

Conclusion

From the above experiment, the amplitude of demodulated signal is obtained as ..........

Precautions

1) Do not use open ended wires to connect 230V, 50Hz power supply.

2) Check the connection before giving the power supply.

3) Observations should be done carefully.

4) Disconnect the circuit after switched off the power supply




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