Amplitude modulation is a technique used in signal processing and communications to alter the amplitude (or volume) of a signal over time. It is a modulation te...
Amplitude modulation is a technique used in signal processing and communications to alter the amplitude (or volume) of a signal over time. It is a modulation technique, which means it involves adding or removing information to a carrier signal to achieve a specific purpose.
It involves varying the amplitude of the carrier signal according to a modulating signal. This allows information to be sent or received by altering the perceived loudness of the signal. The modulating signal can be a continuous signal, like a sine wave, or a discrete signal, like a binary data stream.
The modulated signal can then be transmitted through a communication channel, such as radio waves, or it can be used to generate a visual display. Amplitude modulation can also be used to achieve multiple purposes, such as:
Reducing interference: By varying the amplitude of the carrier signal, interference from other signals can be reduced.
Adding or removing compression or expansion: Amplitude modulation can be used to add or remove compression or expansion to the signal, which can be used to control the noise level.
Changing the bandwidth of a signal: By varying the amplitude of the carrier signal, the bandwidth of the signal can be changed.
There are two main types of amplitude modulation:
Linear amplitude modulation: This type of modulation results in a linear relationship between the modulating signal and the amplitude of the carrier signal.
Non-linear amplitude modulation: This type of modulation results in a non-linear relationship between the modulating signal and the amplitude of the carrier signal.
Amplitude modulation is a versatile technique that can be used to achieve a variety of communication and signal processing applications