AM receivers are simple, detection is easy . The main advantages of FM over AM are: Improved signal to noise ratio (about 25dB) w.r.t. AM receivers are cost efficient . AM method of audio transmission was successfully carried out in the mid-1870s. The following are the advantages of Standard Amplitude Modulation : AM transmitters are less complex . Frequency Modulation. In frequency modula-tion, the amplitude and phase of the carrier wave remains constant. There is another high-frequency signal called carrier. Frequency range. Full form. 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. amplitude modulation vs frequency modulation vs phase modulation. The typical frequency range in which AM works is 535 to 1705 Kilohertz, whereas the frequency range is around 88-108 Megahertz for FM. FM radio was developed in the United States in the 1930s by Edwin Armstrong. Frequency modulation. This block diagram shows the modulation of two message signals. As discussed earlier, high-frequency signals can be propagated over longer distances than lower frequency signals. The carrier source produces carrier signal. Modulating differences 3. AM versus FM Mode of modulation. Origin. AM. The carrier signal with 0° phase shift is used with the first message signal m 1 (t) and the carrier signal with 90° phase shift is used with the second message signal m 2 (t).Both modulated signals are then added using summer to make a single signal having same frequency and bandwidth. (i) amplitude modulation, (ii) frequency modulation and (iii) phase modulation . 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. 1. 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. AM works by modulating (varying) the amplitude of the signal or carrier transmitted according to the information being sent, while the frequency remains constant. 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. The purpose of AM is to translate the low-frequency baseband signal to a higher freq signal using the carrier. The equipment cost of an FM channel is more since the equipment is much more complex and involves complicated circuitry. AM waves can travel a longer distance . 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. Disadvantages of Frequency Modulation over Amplitude Modulation: The equipment needed for FM and AM systems is different. Amplitude modulation. 2. to man made interference. 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 derivatives of amplitude modulation include the following. 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. Advantages of Standard Amplitude Modulation. As a result FM systems are costlier than AM systems. FM. Low bandwidth; Applications of AM. 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.