What is the amplitude modulation?
In order to transmit information via radio waves, the information must be inserted into the radio waves somehow. The earliest developed method for inserting information is known as amplitude modulation. Amplitude modulation is a method of modifying the support signal with an audio signal, so the sound signal can be transmitted to the receiver. It is used today on two -way radio and radio broadcasting. AM in AM radio means modulation of amplitude.
Amplitude is the amount of energy in the sound wave. Loud sounds are made by waves with high amplitude, while the quieter sounds are produced by lower amplitude waves. The frequency is the number of waves that pass through a fixed point during a given amount of time. During the amplitude modulation, the frequency of the support signal remains constant, but its amplitude changes to match the amplitude of the sound signal. To avoid distortion, the amplitude of the carrier should be greater than the amplitory of the sound signal.
The amplitude modulation production device isA device without lines known as a modulator. It is called a line without a line because it has two inputs, carrier and audio signal, but only one output, modulated signal. This output is transmitted to the receiver, where it must then be re -divided into its components in a process known as demodulation.
Demodulation removes the sound signal from the carrier signal. Without this step, it would not be possible to hear an audio signal through the interference created by the carrier signal. There are several types of demodulators, but all are used to remove the carrier signal to hear the sound signal.
The main advantage of the amplitude modulation is that it is a cheap way of transmission of radio signals because it requires only a few easily obtained parts. In many cases, however, it was replaced by frequency modulation (FM) and other forms of transmission. The reason is double: it is ineffective and is subject to a high level of noise in the background.
amplitude MODULU is ineffective when using the strength and bandwidth. A large percentage of the necessary power is used by a support signal, which is then removed. It also uses almost twice as much bandwidth as other transmission methods. One of the practical consequences is that fewer radio stations are able to function in the area. The amplitude modulation is also background noise sensitive, which can lead to poor sound quality.