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The process of extracting an original message signal from the modulated wave is known as detection or demodulation. The circuit, which demodulates the modulated wave is known as the demodulator. The following demodulators (detectors) are used for demodulating AM wave. Square Law Demodulator; Envelope Detector; Square Law Demodulator
Learn how to generate and demodulate an amplitude modulated signal using the Analog Discovery Studio and LabVIEW. Explore the effects of modulation index, FFT, windowing and averaging on the quality of the demodulated signal.
- Creating The Signal
- Demodulation
- Summary
We’ll use LTspiceto study techniques for demodulating an AM waveform. But before we demodulate we need something that is modulated. In the AM modulation page, we saw that four things are needed to generate an AM waveform. First, we need a baseband waveform and a carrier waveform. Then we need a circuit that can add an appropriate DC offset to the b...
As discussed in the AM modulation page, the multiplication operation used to perform amplitude modulation has the effect of transferring the baseband spectrum to a band surrounding the positive carrier frequency (+fC) and the negative carrier frequency (–fC). Thus, we can think of amplitude modulation as shifting the original spectrum upward by fC ...
In LTspice, an arbitrary behavioral voltage source can be used to create an AM waveform.AM waveforms can be demodulated using a multiplier followed by a low-pass filter.A simpler (and lower-cost) approach is to use a leaky peak detector, i.e., a peak detector with parallel resistance that allows the capacitor to discharge at an appropriate rate.- Robert Keim
Learn how to transmit and recover information via radio carrier waveform using amplitude modulation (AM). Explore different methods of demodulation, such as envelope detection, square-law detection, synchronous detection and asynchronous detection.
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There are several ways of demodulation depending on how parameters of the base-band signal such as amplitude, frequency or phase are transmitted in the carrier signal. For example, for a signal modulated with a linear modulation like AM (amplitude modulation), we can use a synchronous detector.
Jan 30, 2021 · Learn about different methods of amplitude modulation and demodulation of signals, and how to recover the carrier in analog and digital communication. The chapter covers DSB-LC, DSB-SC, SSB, and adaptive carrier synchronization techniques.
Learn about digital modulation, the process of converting bits into waveforms for transmission over a channel. Explore signal constellations, pulse waveforms, and channel imperfections such as delay and noise.
