What is Noise in Communication? A broad definition of noise in communication is something that keeps a receiver from completely comprehending a message. Distractions can inhibit a person from offering his undivided attention and may keep him from fully grasping what you are trying to say.
Difference Between FDM and FDMA. Frequency Division Multiplexing, or FDM, is a multiplexing technique for the physical layer that allows multiple low bandwidth signals to share the same high bandwidth frequency range. It is achieved by allocating a smaller frequency range to each signal that is using the same channel.
Foamed polyurethane (FPU) is a soft polyurethane foam containing 90 % of air by volume. It is used as cushioning and supporting material, and as elastic additive to the goods and insulation. Because of its fine-meshed structure the polyurethane foam is characterized by good elasticity and air permeability.