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May 15, 2024 · Amplitude modulation is a modulation technique employed in electronic communication and modifies the carrier wave's amplitude (signal intensity) in accordance to the message signal, such as an audio signal i.e. a modulating signal.
When we talk about amplitude modulation, it is a technique that is used to vary the amplitude of the high-frequency carrier wave in accordance with the amplitude of the modulating signal. But the frequency of the carrier wave remains constant.
A continuous-wave goes on continuously without any intervals and it is the baseband message signal, which contains the information. This wave has to be modulated. According to the standard definition, “The amplitude of the carrier signal varies in accordance with the instantaneous amplitude of the modulating signal.”.
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal.
Here, A0 = Ac + m (t) Thus, modulated wave is given as, Now, the question that strikes our mind is up to what extent a carrier is amplitude modulated. So, the answer to this question is the modulation index. The modulation index is the term that shows the amount by which a carrier signal is amplitude modulated. Considering equation 1 again.
Sep 25, 2024 · Learn more about Amplitude Modulation in detail with notes, formulas, properties, uses of Amplitude Modulation prepared by subject matter experts. Download a free PDF for Amplitude Modulation to clear your doubts.
Example 1. The pre-envelope of x(t) = cosωct is x+(t) = cosωct+j sinωct = ej ωct Example 2. Let m(t) be a lowpass signal with cutoff frequency W which is less than the carrier frequency ωc. Then the pre-envelope of x(t) = m(t)cosωct is x+(t) = m(t)cosωct+jm(t)sinωct = m(t)ej ωct 5-13
Oct 26, 2023 · There are several types of Amplitude Modulation, including Double Sideband Suppressed Carrier (DSB-SC), Single Sideband Suppressed Carrier (SSB-SC), and Quadrature Amplitude Modulation (QAM). These variations offer different trade-offs in terms of complexity, bandwidth efficiency, and power requirements.
In demonstrating amplitude modulation, we first use simple modulating waveforms from the signal generator. As a final demonstration, we examine the modulated and demodulated waveforms characteristic of an AM radio. Suggested Reading.
Chapter 3.1. Introduction. Wireless Information Transmission System Lab. Institute of Communications Engineering National Sun Yat-sen University. Purpose of a communication system: convey information through a medium or communication channel.
