Definition of amplitude modulation in US English:
amplitude modulation
(also AM)
nounˈampləˌt(y)o͞od ˌmäjəˌlāSHən
The modulation of a wave by varying its amplitude, used chiefly as a means of radio broadcasting, in which an audio signal is combined with a carrier wave.
调幅，振幅调制。常与FREQUENCY MODULATION 相对
Often contrasted with frequency modulation
Example sentencesExamples
- A controller selectively controls the first and second transistors to achieve amplitude modulation at a high modulation bandwidth.
- Optical systems are used to generate the original signal which is passed, using amplitude modulation to a 300GHz photodiode, which creates an electrical signal that is passed to a direct slot antenna.
- Even in more slowly rotating vehicles, residual phase and amplitude modulation produced by adaptive interference-canceling systems can significantly reduce GPS acquisition and tracking performance.
- This is consistent with the pronounced amplitude modulation of the shorter cycles noted above.
- Its phase can be adjusted to compensate for propagation delays in the drive circuitry, while amplitude modulation is accomplished by switching in additional reactive conductance to increase the current injected into the tank circuit.