angular modulation的意思|示意

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Angular Modulation (AM) is an important method used in telecommunication and radio broadcasting. It can be used for transmission of analog signals, such as voices and music, as well as digital signals, such as for remote control and data transmission.

In angular modulation, the signal to be modulated is connected to a rotating antenna that radiates the signal in all directions. A rotating antenna is necessary because the signal needs to be transmitted in order to be heard or received. The rotation of the antenna causes the signal to be modulated, so that it is heard in a particular direction and not in other directions. Relaying a signal in any direction requires angular modulation.

Angular modulation is used for analog signals as well as digital signals. In the case of analog signals, the amplitude of the signal is varied according to the signal strength, so that the signal can be heard in all directions. On the other hand, in the case of digital signals, the signal is modulated by changing the frequency. This is done with the use of a modulator which changes the frequency of the signal as the antenna rotates.

In radio broadcasting, angular modulation is used to transmit both radio and television signals. The signal is modulated so that it is heard or received in all directions, regardless of the location of the receiver.

Angular modulation is also used in the transmission of data via satellite. Here, the signal is modulated so that it is received only in the region of the antenna which was pointed towards the satellite.

Angular modulation is an important method of transmission used in communication and broadcasting. Its ability to send signals in all directions, regardless of the location of the receiver, makes it useful for many applications.