EMDA/P | PULSE MODULATIONS UNIT

The Pulse Modulations Unit, “EMDA/P”, is a complete modulations unit designed to explain the basic concepts of pulse modulation. It covers the principles of many of the modulation and demodulation techniques used in modern communication systems.

The unit provides a basic understanding of the concepts behind pulse communications techniques: Pulse Code Modulation (PCM), Pulse Amplitude Modulation (PAM), Pulse Width Modulation (PWM), Pulse Density Modulation (PDM), Pulse Position Modulation (PPM). Finally, it allows students to study the basic principles of Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM) are introduced.

SPECIFICATION

All elements are mounted in a metallic box, with power supply and block diagram.

Functional blocks:

• Modulators and demodulators
  • Pulse Code Modulation (PCM)
    • Sample & Hold circuit.
  • Analog to Digital Converter (ADC).
    • Parallel to Serial circuit.
    • Serial to Parallel circuit.
  • Digital to Analog Converter (DAC).
    • Filter.
  • Pulse Amplitude Modulation (PAM):
    • Sampler circuit.
    • Filter.
  • Pulse Width Modulation (PWM):
    • Sawtooth Generator circuit.
    • Comparator circuit.
    • Filter.
  • Pulse Density Modulation (PDM):
    • Sawtooth Generator circuit.
    • Comparator circuit.
    • Filter.
  • Pulse-Position Modulation (PPM):
    • Pulse Generator circuit.
    • Samplers circuits.
    • Phase Shifter.
    • Filters.
  • Delta Modulation (∆M):
    • Sample Generator circuit.
    • Comparator circuit.
    • Integrators circuit.
    • Amplifiers.
    • Filters.
• Time Division Multiplexing (TDM):
  • • Multiplexer and Demultiplexer.
    • Synchronization circuits.
• Frequency Division Multiplexing (FDM):
  • • Local Oscillators.
    • Mixers.
    • Adder circuit.
    • Band-Pass Filters.
    • Low Pass Filters.
• Analog Generators:
  • • Two audio signals.
    • Two carrier signals.
• Five analog Inputs.
• Ten analog Outputs.
• 28 test points.
• Two controls.

Cables and Accessories, for normal operation.

Manuals: This unit is supplied with the following manuals: Required Services, Assembly and Installation, Starting-up, Safety, Maintenance & Practices Manuals.