a demodulator sole function is to restore the original modulating signal. it works by removing the Carrier
Modulator-Demodulator stands for modem
diode detector for am demodulation
Most common nowadays is the quadrature detector. PLL detectors are still common too.
The intermediate frequency in the superheterodyne receiver is chosen as the desired compromise between sensitivity and selectivity. 455kHz is used in AM broadcast applications, while 10.7mHz is used for FM. The IF stage is tuned for a steep skirt passband at that frequency, allowing only the desired heterodyned (shifted) input signal to make it through to the demodulator.
Modulation is used when information is available in analog form that varies the frequency and/or amplitude of a lower frequency wave, depending on the information it carries. The role of modulation is to place this information onto a carrier frequency that can be transmitted more readily and with least loss of information. There are three fundamental types of modulation - frequency modulation, amplitude modulation and phase modulation. In each of these, a carrier frequency is modulated by a lower frequency, to form a modulated carrier wave. A modulator modulates the carrier frequency, while a demodulator detects the modulation on the carrier wave and recovers the original lower frequency waveform at the destination. For many years the modulated carrier wave was converted to a radio signal. Now it is often an electrical signal which is sent down a teleohone line; the information is usually a set of pulses going between computers. When computers are connected to each other in a two-way conversation, the MOdulator and DEModulator are combined into a single device called a MODEM.
demodulator
modem (modulator + demodulator)
Exciter Power amplifier Input filter/amplifier Demodulator Audio processor
Modulator-Demodulator stands for modem
Modulator/Demodulator
Modulator and Demodulator
demodulator circuit is a circuit which is used for remove all high frequency components from modulated signal.
modulator demodulator
Modem = modulator-demodulator, and is a tool for tweaking an analog signal so that it can be used in a digital device.
MODEM stands for 'Modulator-Demodulator'.
modulator-demodulator
MODEM modulation & demodulation .......