amplitude modulation的意思|示意

Amplitude modulation (AM) is a type of analog modulation used in radio broadcasting. It is the process of varying the amplitude of a carrier wave to convey information. This can be done by modulating the amplitude of a sine wave generated by a signal generator, then transmitting the wave across a radio frequency band.

The process of amplitude modulation allows the transmission of information through an audio signal, as it is easier to send a single frequency in an effective way. This allows messages to be sent through a medium such as radio or television, as well as through phone lines, which makes it useful for both long-distance and short-distance communication.

In AM radio broadcasting, the amplitude of the signal is increased and decreased to represent the information being transmitted. This is done by modulating the radio signal with audio signals. The amplitude of the radio signal is manipulated in order to vary the amplitude at which the audio-signal is sent. This increases and decreases the amplitude of the radio signal such that the sound produced by the radio is more audible.

AM radio is commonly used for radio broadcasting, as it is an effective way of sending messages over long distances. It is also used in two-way radio communication, such as in the military and in police radios, as it allows for more reliable communication over large distances.

AM is also used in some forms of data transmission, such as modems, as it allows signals to be sent over phone lines or through a radio frequency band. It is also used in some types of modern digital audio recording, such as in the transmission of digital audio broadcasting (DAB).

In conclusion, amplitude modulation is a type of analog modulation used in radio broadcasting and other forms of communication. It allows information to be sent over a range of frequencies and is used for radio broadcasting, two-way radio communication, and digital audio recording.