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An AM signal encodes the information into the carrier wave by varying its amplitude in direct sympathy with the analogue signal to be sent. There are two methods used to demodulate AM signals: The envelope detector is a very simple method of demodulation that does not require a coherent demodulator.
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 .
Such a device is often used to demodulate AM radio signals because the envelope of the modulated signal is equivalent to the baseband signal. To sufficiently attenuate the frequency of the carrier wave frequency f carrier {\displaystyle f_{\text{carrier}}} , the cutoff frequency of the low-pass filter should be well-below the carrier wave's ...
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 ...
A product detector is a type of demodulator used for AM and SSB signals. Rather than converting the envelope of the signal into the decoded waveform like an envelope detector, the product detector takes the product of the modulated signal and a local oscillator, hence the name. A product detector is a frequency mixer.
IQ modulation and demodulation. LO is the local oscillator - the carrier sine wave being modulated I(t) and Q(t) are the time-series data for the in-phase and quadrature components.
A demodulator (sometimes detector) is a circuit that performs demodulation, the inverse of modulation. ... with amplitude modulation by a 1,000 Hz sinusoid. Two ...
Pulse-amplitude modulation (PAM) is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. It is an analog pulse modulation scheme in which the amplitudes of a train of carrier pulses are varied according to the sample value of the message signal. Demodulation is performed by ...