Pulse Modulations Unit

The Pulse Modulations Unit, is a complete modulations unit designed to explain the basic concepts of pulse modulation.

ATENG 10955 — Pulse Modulations Unit

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.
  Thirteen analog outputs.
  Twenty eight test points.
  Two controls.
  Cables and accessories, for normal operation.