In frequency modula-tion, the amplitude and phase of the carrier wave remains constant. This block diagram shows the modulation of two message signals. to man made interference. AM receivers are cost efficient . Origin. Advantages of frequency modulation, FM: FM has poorer spectral efficiency than some other modulation formats: Some phase modulation and quadrature amplitude modulation formats have a higher spectral efficiency for data transmission than frequency shift keying, a form of frequency modulation. Frequency Modulation. Frequency modulation (FM) When the frequency of carrier wave is changed in accordance with the intensity of the signal, the process is called frequency modulation. AM versus FM Mode of modulation. As a result FM systems are costlier than AM systems. Another advantage that FM has over Am other than superior noise performance is the fact that low-level modulation can be used with subsequent highly efficient class C power amplifiers. AM method of audio transmission was successfully carried out in the mid-1870s. The equipment cost of an FM channel is more since the equipment is much more complex and involves complicated circuitry. FM radio was developed in the United States in the 1930s by Edwin Armstrong. Low bandwidth; Applications of AM. The main advantages of FM over AM are: Improved signal to noise ratio (about 25dB) w.r.t. AM. Disadvantages of Frequency Modulation over Amplitude Modulation: The equipment needed for FM and AM systems is different. This page on amplitude modulation(AM) vs frequency modulation(FM) vs phase modulation(PM) describes difference between amplitude modulation,frequency modulation and phase modulation types.. All these modulation types are analog modulation techniques. Frequency modulation. The derivatives of amplitude modulation include the following. The following are the advantages of Standard Amplitude Modulation : AM transmitters are less complex . The purpose of AM is to translate the low-frequency baseband signal to a higher freq signal using the carrier. 1. The carrier source produces carrier signal. FM. The typical frequency range in which AM works is 535 to 1705 Kilohertz, whereas the frequency range is around 88-108 Megahertz for FM. amplitude modulation vs frequency modulation vs phase modulation. 2. AM receivers are simple, detection is easy . Advantages of Standard Amplitude Modulation. Full form. (i) amplitude modulation, (ii) frequency modulation and (iii) phase modulation . FM is a so called angle modulation scheme, it was inspired by phase modulation but has proved to be more useful partly for its ease of generation and decoding. As mentioned earlier, AM involves the alteration of the amplitude of the carrier wave, whereas FM involves changes in the frequency of the carrier wave. The process of varying amplitude of the high-frequency or carrier wave in accordance with the intelligence (code, voice or music) to be transmitted, keeping the frequency and phase of the carrier wave unchanged, is known as the amplitude modulation. AM (or Amplitude Modulation) and FM (or Frequency Modulation) are ways of broadcasting radio signals.Both transmit the information in the form of electromagnetic waves. Amplitude modulation. Modulating differences There is another high-frequency signal called carrier. As discussed earlier, high-frequency signals can be propagated over longer distances than lower frequency signals. 3. AM waves can travel a longer distance . AM works by modulating (varying) the amplitude of the signal or carrier transmitted according to the information being sent, while the frequency remains constant. 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