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In-phase (I) and quadrature (Q) modulation and demodulation block diagram. Items portrayed in this file depicts. creator. some value. author name string: Vigneshdm1990.
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English: Simple diode detector used to extract the envelope of the input signal. The output signal is the voltage across the capacitor, which is alternatively charged (whenever the input signal's voltage is higher that the capacitor's voltage) and then discharged through the resistor.
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.
A schematic of a superhet AM receiver. Note that the radio includes an AGC loop in order to maintain the RF and IF stages in their linear region, and to produce an audio output not dependent on the signal power received. Here we show block diagrams for typical superheterodyne receivers for AM and FM broadcast respectively.
Demodulation is the process of extracting the original information-bearing signal from a carrier wave. A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave. [1] There are many types of modulation, and there are many types of ...
A major category of AM demodulation technique involves envelope detection, since the envelope of an AM signal is the original signal. A diode detector is a type of simple envelope detector. It consists of a diode connected between the input and output of the circuit, with a resistor and capacitor in parallel from the output of the circuit to ...
The product demodulator has some advantages over an envelope detector for AM signal reception. The product demodulator can decode overmodulated AM and AM with suppressed carrier. A signal demodulated with a product detector will have a higher signal-to-noise ratio than the same signal demodulated with an envelope detector.