Amplitude modulation is a technique used to transmit content on a radio carrier wave. Changes, or modulations, in the transmitted signal's strength help to specify the sound or image to be reproduced on the receiving end of the signal. Amplitude modulation was first used in the early 1900s and has been in constant use since the early days of radio.Know More
Amplitude modulation is used for broadcasting radio transmissions, ground-to-air communication, two-way radio, short-range wireless transmission, Wi-Fi and cellular telecommunications. The abbreviation "AM" is usually used to refer to radio transmissions on the medium-wave broadcast band. Although amplitude modulation is usually thought of in terms of radio, the technique can also carry video signals.
Amplitude modulation is the simplest way of modulating an electronic communications signal, and the demodulation of the signal, which converts it back into an audio frequency signal, is simple as well. An AM signal has two-thirds of its power concentrated in the carrier signal, which carries no useful information, and the rest in two mirror-image sidebands; as a result, the power usage of AM is inefficient. It also uses bandwidth inefficiently and is prone to high levels of noise because an AM receiver detects electromagnetic interference in proportions equal to its detection of the actual signal sent.Learn more about Optics & Waves
Pulse position modulation, or PPM, is a signal modulation used for digital and analog transmissions. PPM is used mostly for optical communication systems such as fiber optic and infrared remotes, when efficiency is needed and there is little chance of interference.Full Answer >
The amplitude of a transverse wave is the measurement from the top point or lower point of the wave to the mid point. Amplitude is the amount of energy that the wave contains.Full Answer >
Amplitude affects the loudness of sound by using vibration to make the sound larger or smaller than it is in actuality. Amplitude is a factor which directly impacts the sound.Full Answer >
In scientific terms, amplitude describes a change of magnitude in an oscillating or wave-like system. When used without specifications, the term refers to the distance between a line drawn through the middle of the system at the point of equilibrium to the wave peak farthest from that line.Full Answer >