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Horizontaal
Analog Modulation Techniques 
AM and FM radio to illustrate how a signal is sent via AM or FM radio
AM demodulation
Amplitude Modulation To show the effect of modulating a sine wave with another sine wave
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
Amplitude modulation 3 The applet shows an amplitude modulated signal
Amplitude modulation 4
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
Démodulation d'amplitude
Double sideband modulation double sideband modulation, DSB, Educypedia
Double side band Suppressed Carrier System (DSB/SC)
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
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, ...
Frequency modulation in frequency modulation the amplitude is kept constant and the frequency is modulated by the amplitude of the modulating signal
Frequency modulation and Bessel functions the spectrum of a frequency modulated signal must be determined using Bessel functions
Frequency modulation fundamentals
Frequency modulation frequency modulation, FM
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
Modulation AM Italian
Modulation AM et FM en Français
Modulations d'amplitude et de fréquence en Français
Modulations d'amplitude et de fréquence en Français
Modulation d'amplitude en Français
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
Phase and Frequency Modulation Phase and Frequency Modulation, To give an overview of two angle modulation methods (phase modulation and frequency modulation)
Phase Modulation Phase Modulation, PM
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
Single sideband modulation single sideband modulation, SSB
Single Side band suppressed Carrier (SSB/SC) Filter method of producing SSB/SC signals
Spectre d'un signal modulé en amplitude en Français
Spectre d'un signal modulé en fréquence en Français
Horizontaal
Digital Modulation Techniques 
16-QAM 16 QAM with noise
ADSL transmission applet QAM, ADSL-like transmissions, basically ADSL uses multiple carrier modulation : multiple QAM (Quadrature Amplitude modulation)
Amplitude Shift Keying Amplitude Shift Keying modulation technique
CDMA Coding This applet demonstrates CDMA multiple access coding and allows the user to see the process of coding and decoding in real time
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
Eye Diagram
Huffman tree
IQ modulation IQ modulation, "I" is the "in-phase" component of the waveform, and "Q" represents the quadrature component
Modulateur à quadrature en Français
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
PAM, PPM, PDM, PWM Pulse Amplitude Modulation (PAM), Pulse Position Modulation (PPM), Pulse Duration Modulation (PDM), Pulse Width Modulation (PWM), PCM
PAM PAM: pulse amplitude modulation
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
Pulse Code Modulation Pulse Code Modulation, PCM
Pulse position modulation a PPM signal and how it changes with amplitude and frequency of the modulating signal
Pulse width modulation this form of modulation is often used in control applications as the average value is proportional to the pulse width
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
QAM Quadrature Amplitude Modulation, QAM
Quadrature Amplitude Modulation combinations of AM and PSM are used in Quadrature Amplitude Modulation
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
Wavelet compression
Horizontaal
 
 
 
 
 

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