The ETB-221 DPCM and Demodulation Trainer is a comprehensive training system designed to demonstrate the principles of Differential Pulse Code Modulation (DPCM) and its demodulation process. DPCM is widely used in digital communication systems for efficient signal transmission by encoding the difference between successive samples rather than the absolute values.

This trainer provides an integrated platform with all necessary circuits including signal generators, samplers, quantizers, encoders, decoders, and reconstruction filters. It is an ideal teaching tool for advanced study in digital communication, data compression, and signal processing techniques.

Key Features:

• Complete setup for DPCM modulation and demodulation

• In-built analog signal generator

• Sampling and quantization circuits

• Delta encoder and decoder

• Low-pass reconstruction filter

• Scope terminals for input and output waveform analysis

• On-board power supply

• Designed for hands-on experiments in communication engineering

Educational Objectives:

• Study of DPCM encoding process

• Analysis of DPCM decoding and signal recovery

• Understanding advantages over standard PCM

• Visualization of quantized signals and error signals

• Demonstration of signal compression efficiency