Αποτελέσματα Αναζήτησης
16 Μαΐ 2024 · Amplitude modulation is a modulation in which the amplitude of the carrier wave changes according to the instantaneous amplitude of the modulating signal, keeping phase and frequency constant. The amplitude of the carrier wave is modified in order to send the data or information.
In the frequency domain, amplitude modulation corresponds to translating the baseband spectrum to a band surrounding the carrier frequency. Because the baseband spectrum is symmetrical with respect to the y-axis, this frequency translation results in a factor-of-2 increase in bandwidth.
Modulation means variation of the amplitude or the phase (or both) of an otherwise constant sinusoidal RF carrier wave in order that the signal carry information: digital data or analog waveforms such as audio or video. In this chapter we look at pure amplitude modulation (AM) and pure frequency modulation (FM).
Digital amplitude modulation involves varying the amplitude of a carrier wave in discrete sections according to binary data. The most straightforward approach to digital amplitude modulation is on-off keying.
Modulation. December 1, 2011. Applications of signals and systems in communication systems. Example: Transmit voice via telephone wires (copper) mic. amp. telephone wire. amp. speaker. Works well: basis of local land-based telephones. In cellular communication systems, signals are transmitted via elec tromagnetic (E/M) waves. mic. amp. E/M wave.
An interactive demo which enables you to both see and hear the result of multiplying a sine wave with a cosine amplitude envelope.
Digital Modulation: Amplitude and Frequency; Digital Phase Modulation: BPSK, QPSK, DQPSK; Comparing and Contrasting Amplitude, Frequency, and Phase Modulation
