Analog Modulation Techniques  |
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AM and FM radio
to illustrate how a signal is sent via AM or FM radio |
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AM demodulation |
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Amplitude
Modulation To show the effect of modulating a sine wave with another sine
wave |
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Amplitude
modulation amplitude modulation was the original method used for transmitting audio signals over radio frequency waves. It is
still used today in AM radio. This applet demonstrates the modulation process |
| Amplitude
modulation2 amplitude modulation |
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Amplitude
modulation 3 The applet shows an amplitude modulated signal |
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Amplitude
modulation 4 |
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AM-FM modulation -
AM demodulation in amplitude modulation the amplitude of a slowly varying signal is impressed
onto the amplitude of a rapidly varying signal |
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Démodulation d'amplitude |
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Double
sideband modulation double sideband modulation, DSB,
Educypedia |
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Double side band
Suppressed Carrier System (DSB/SC) |
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FM
spectra the spectrum generated by an FM pair centers on the carrier
frequency, with sidebands found at multiples of the modulating frequency added
and subtracted from the carrier. The power at each sideband is determined by
the index of modulation (modAmp/modFreq) and a Bessel function, Frequency
modulation and Bessel functions |
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Frequency
modulation Frequency modulation is the process of varying the frequency of a
carrier wave in proportion to the instantaneous amplitude of the modulating signal, ... |
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Frequency
modulation in frequency modulation the amplitude is kept constant and the
frequency is modulated by the amplitude of the modulating signal |
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Frequency
modulation and Bessel functions the spectrum of a frequency modulated signal
must be determined using Bessel functions |
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Frequency
modulation fundamentals |
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Frequency modulation frequency modulation, FM |
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Frequency Shift
Keying (FSK) Frequency shift keying employs two different carrier
frequencies which are switched ON and OFF alternately by the mark and space
signal |
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Modulation
AM
Italian |
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Modulation
AM et FM
en Français |
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Modulations
d'amplitude et de fréquence
en Français |
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Modulations
d'amplitude et de fréquence
en Français |
| Modulation d'amplitude
en Français |
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Modulation
Techniques The following simulation will show the waveform generated by
different modulation techniques: digital modulation, frequency modulation, FM,
amplitude modulation, AM, Combinations of AM and PSM, Quadrature Amplitude
Modulation, phase shift modulation |
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Phase and
Frequency Modulation Phase and Frequency Modulation, To give an overview of
two angle modulation methods (phase modulation and frequency modulation) |
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Phase Modulation
Phase Modulation, PM |
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Single
side band demodulation in single-side-band
demodulation, the carrier is reinserted before the modulation signal is
extracted using envelope detection. The amplitude of the reinserted carrier
determines how close the demodulated signal is to the original modulating
signal |
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Single
sideband modulation single
sideband modulation, SSB |
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Single Side band
suppressed Carrier (SSB/SC) Filter method of producing SSB/SC signals |
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Spectre d'un signal modulé en amplitude
en Français |
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Spectre d'un signal modulé en fréquence
en Français |
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Horizontaal |
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Digital Modulation Techniques |
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16-QAM
16 QAM with noise |
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ADSL
transmission applet QAM, ADSL-like transmissions, basically ADSL uses
multiple carrier modulation : multiple QAM (Quadrature Amplitude modulation) |
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Amplitude Shift Keying Amplitude Shift Keying modulation technique |
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CDMA Coding This
applet demonstrates CDMA multiple access coding and allows the user to see the
process of coding and decoding in real time |
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CDMA
transmission a Java applet simulates here multiple bit transmissions on the
same communication link. The receiver extracts one of the transmitter messages
from the transmitted signal by a correlation computation with the tranmitter
code which is assumed known |
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Eye Diagram |
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Huffman tree |
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IQ
modulation IQ
modulation, "I" is the "in-phase" component of the waveform, and "Q" represents
the quadrature component |
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Modulateur à quadrature
en Français |
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Modulation
Techniques The following simulation will show the waveform generated by
different modulation techniques: digital modulation, frequency modulation, FM,
amplitude modulation, AM, Combinations of AM and PSM, Quadrature Amplitude
Modulation, phase shift modulation |
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PAM, PPM, PDM, PWM Pulse Amplitude Modulation (PAM), Pulse Position
Modulation (PPM), Pulse Duration Modulation (PDM), Pulse Width Modulation (PWM),
PCM |
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PAM
PAM: pulse amplitude modulation |
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Phase Shift Keying
(PSK) Phase Shift Keying (PSK), In PSK, the mark and space signals are represented by 180º phase shift and zero phase shift respectively |
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Pulse Code
Modulation Pulse Code Modulation, PCM |
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Pulse position
modulation a PPM signal and how it changes with amplitude and frequency of
the modulating signal |
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Pulse width
modulation this form of modulation is often used in control applications as
the average value is proportional to the pulse width |
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QAM
QAM takes advantage of the fact that the greater the number of symbols, the
greater the efficiency of the system. Occupied bandwidth is determined,
mostly, by the symbol rate. So the more bits (the fundamental information
units) per symbol, the higher the efficiency. The number of symbols required
for a given system is 2n, where n is the number of bits per symbol.
For 16 QAM, n = 4 and there are 16 symbols–each symbol represents four bits:
0000, 0001, 0010 |
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QAM
Quadrature Amplitude Modulation, QAM |
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Quadrature Amplitude
Modulation combinations of AM and PSM are used in Quadrature Amplitude
Modulation |
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Signal
Processing for Cellular Communication Systems Data Flow Diagram, Amplitude
Shift Keying, Frequency Shift Keying, Phase Shift Keying, Quadrature Amplitude
Modulation, Flat fading, Multi-path fading |
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Wavelet
compression |
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Horizontaal |
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Last updated on:
2008-06-12
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