There are actually 4 forms. The first and most common is AM, the next is SSB or Single Side band, the third is FM (Frequency Modulation) and the fourth is Digital
The difference between pulse code modulation and delta modulation is that pulse code modulation is a method of encoding audio information digitally while delta modulation is a method that converts analog to digital signal.
In amplitude modulation, modulation depth refers to the ratio of the unmodulated carrier amplitude to the amplitude deviation for which the modulated carrier wave reaches its minimum value. If this minimum value is zero, the modulation depth is 100%.For amplitude modulation,modulation depth = (a-b)/(a+b),wherea is the unmodulated carrier amplitude, andb is the minimum amplitude deviation.The modulation depth ratio is also referred to as the modulation index.
Adaptive delta modulation is used in audio communication systems to avoid the two drawback of delta modulation.
Frequency shift keying in digital communication and Frequency modulation in analog communication..........
what is AM and FM AM normally refers to Amplitude Modulation while FM refers to Frequency Modulation. As the names suggest, in AM, the carrier wave is modulated by the amplitude of the input signal/waveform while in FM, it is based on the frequency. For further information on how exactly it's done, just run a search for Amplitude Modulation / Frequency Modulation and you should be able to find more detailed information about them.
MODULATION is a media for transferring information it can come in many forms FM ,AM, PULSES, PAM and so forth.
Actually there are four:widthamplitudepositioncodeOf these four pulse code modulation is digital while the other three are analog.
Phase modultion is one of the three ways of modulating or altering a signal so that it is able to carry information. The other two are amplitude and frequency modulation. Phase modulation is used in high speed modems.
AM - Amplitude Modulation FM - Frequency Modulation
modulation
Frequency Modulation and Phase Modulation
frequency modulation..
due to velocity modulation density modulation occurs in TWT
The difference between frequency modulation and phase modulation is that with frequency modulation the angular frequency of the signal is modified while with the phase modulation, the phase angle of the signal is modified.
the modulation system is of FM
i dont know ans. of this.
Frequency modulation Phase modulation