About signals and systems

Hello,

I often hear about sinusoidal signals, but i dont know where and how it is used. How is it being used in practical application?

Thanks!

Your question is rather vague...

A sinusoidal signal implies a sine or cosine wave (sine wave phase-shifted by 90 deg). For most purposes, we cannot tell or determine if it is a sine or cosine wave, except when two exist relative to each other.

A few places where sine waves are used:
* Audio/video and testing of A/V equiptment
* Radio/TV broadcast
* Test equipment (signal generators)

Sinusoidal signals is a type of alternating waveform available from commercial supplies. The term alternating indicates only that the waveform alternates between two prescribed levels in a set time sequence.
Sinusoidal ac voltages are available from a variety of sources. The most common source is the typical home outlet, which provides an ac voltage that originates at a power plant.
Sinusoidal ac voltages with characteristics that can be controlled by the user are available from function generators. By setting it to different values, one can make available sinusoidal voltages of different peak values and different repetition rates. The function generator plays an integral role in the investigation of the variety of theorems, method of analysis, etc.