28-25 SEMNALE MODULATE CU PURTĂTOR ARMONIC
MODULATED SIGNALS WITH HARMONC CARRIER
In electronics and telecommunications, modulation means varying some aspect of a higher frequency continuous wave carrier signal with an information-bearing modulation waveform, such as an audio signal which represents sound, or a video signal which represents images, so the carrier will „carry” the information. When it reaches its destination, the information signal is extracted from the modulated carrier by demodulation. In amplitude modulation, the amplitude or „strength” of the carrier oscillations is what is varied. For example, in AM radio communication, a continuous wave radio-frequency signal (a sinusoidal carrier wave) has its amplitude modulated by an audio waveform before transmission.
Keywords: signal modulated, carrier harmonic, information, amplitude, operation detection/recovery
Cuvinte cheie: semnal modulat, purtător armonic, informație, amplitudine, operaţie de detecţie/redresare