Demodulation

Demodulation - Wikipedia, the free encyclopedia
There are several ways of demodulation depending on what parameters of the base ... Retrieved from "http://en.wikipedia.org/wiki/Demodulation" ...
en.wikipedia.org

Demodulation
Describe fm demodulation circuit operation for the phase-shift and gated-beam ... A nonlinear device is required for demodulation. ...
www.tpub.com

demodulation: Definition from Answers.com
demodulation n. The conversion of a modulated carrier wave into a current equivalent to the original signal ... WordNet: demodulation ... Wikipedia: Demodulation ...
www.answers.com

1.3.3.9. Complex Demodulation Phase Plot
The complex demodulation phase plot (Granger, 1964) is used to improve the ... Is the specified demodulation frequency correct? ...
www.itl.nist.gov

Device and method for the demodulation of modulated electric signals ...
A demodulation device (<b>1</b>) in semiconductor technology is disclosed. ... The demodulation method can be exploited in particular for phase-difference ...
www.freshpatents.com

Warning: mkdir() [function.mkdir]: Permission denied in /home/webs/affiliatelib2/CacheManager.php on line 12

Warning: mkdir() [function.mkdir]: No such file or directory in /home/webs/affiliatelib2/CacheManager.php on line 12

Warning: fopen(/home/templatecore2cache//*cluesnet.com/41/41d5ac84a6015159eadf105a8c193488d86b1e01.tc2cache) [function.fopen]: failed to open stream: No such file or directory in /home/webs/affiliatelib2/CacheManager.php on line 130

Warning: fwrite(): supplied argument is not a valid stream resource in /home/webs/affiliatelib2/CacheManager.php on line 131

Warning: fclose(): supplied argument is not a valid stream resource in /home/webs/affiliatelib2/CacheManager.php on line 132

Demodulation is the act of removing the modulation from an analog signal to get the original baseband signal back. Demodulating is necessary because the receiver system receives a modulated signal with specific characteristics and it needs to turn it to base-band.

There are several ways of demodulation depending on what parameters of the base-band signal are transmitted in the carrier signal, such as amplitude, frequency or phase. For example, if we have a signal modulated with a lineal modulation, like AM (Amplitude Modulated), we can use a synchronous detector. On the other hand, if we have a signal modulated with an angular modulation, we must use a FM (Frequency Modulated) demodulator or a PM (Phase Modulated) demodulator respectively. There are different kinds of circuits that make these functions.

An example of a demodulation system is a modem, which receives a telephone signal (electrical signal) and turns this signal from the wire net into a binary signal for the computer.

AM Demodulation An Amplitude modulation signal can be rectified without requiring a Coherence (physics) demodulator. For example, the signal can be passed through an envelope detector (a diode rectifier). The output will follow the same curve as the input baseband signal.

FM Demodulation There are several ways to demodulate an FM signal. The most common is to use a discriminator. This is composed of an electronic filter which decreases the amplitude of some frequencies relative to others, followed by an AM demodulator. If the filter response changes linearly with frequency, the final analog output will be proportional to the input frequency, as desired. Another one is to use two AM demodulators, one tuned to the high end of the band and the other to the low end, and feed the outputs into a difference amp. Another is to feed the signal into a phase-locked loop and use the error signal as the demodulated signal.

PM Demodulation main article Phase modulation

QAM Demodulation main article QAM#Receiver

demodulation from FOLDOC
demodulation < communications > To recover the signal from the carrier. For example, in a radio broadcast using amplitude modulation the audio signal is transmitted as the mean ...

demodulation from FOLDOC
demodulate ==> demodulation < communications > To recover the signal from the carrier. For example, in a radio broadcast using amplitude modulation the audio signal is transmitted ...

Demodulation - Wikipedia, the free encyclopedia
Demodulation is the act of removing the modulation from an analog signal to get the original baseband signal back. Demodulating is necessary because the receiver system receives a ...

demodulation definition of demodulation in the Free Online ...
demodulation: see modulation modulation, in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information ...

demodulation - Hutchinson encyclopedia article about demodulation
In radio, the technique of separating a transmitted audio frequency signal from its modulated radio carrier wave. At the transmitter, the audio frequency signal (representing ...

demodulation - definition of demodulation by the Free Online ...
de·mod·u·la·tion (d-m j-l sh n) n. The conversion of a modulated carrier wave into a current equivalent to the original signal. Also called detection.

Amplitude Modulation and Demodulation
Up until now we've just considered the creation, transmission and reception of electromagnetic fields. In effect, we've seen how EM power can be carried from place to place.

Radio-Electronics.Com :: Synchronous demodulation / detection
An overview explaining the advantages of synchronous demodulation or detection of amplitude modulation (AM), explaining how it works.

Demodulation level selection in adaptive modulation - ECS EPrints ...
A novel, uneven protechtion, modulation scheme is proposed for the transmission of control symbols in adaptive modulation. Theoretical and simulated results for transmissions over ...

Modulation & Demodulation
Altera's IP MegaStore offers Altera MegaCore functions and AMPP partner megafunctions that are optimized for Altera programmable logic devices (PLDs) to speed your system to market ...