What is frequency modulation explain with diagram?
Frequency Modulation (FM) is the encoding of information in a carrier wave by changing the instantaneous frequency of the wave. FM technology is widely used in the fields of computing, telecommunications, and signal processing.
What is the principle of FM?
FM Theory. The basic principle behind FM is that the amplitude of an analog baseband signal can be represented by a slightly different frequency of the carrier.
What is frequency modulation and its types?
Frequency modulation can be classified as narrowband if the change in the carrier frequency is about the same as the signal frequency, or as wideband if the change in the carrier frequency is much higher (modulation index > 1) than the signal frequency.
What are the advantages of frequency modulation?
The main advantages of FM over AM are:
- Improved signal to noise ratio (about 25dB) w.r.t. to man made interference.
- Smaller geographical interference between neighboring stations.
- Less radiated power.
- Well defined service areas for given transmitter power.
Why do we need frequency modulation?
Frequency modulation (FM) Because the frequency of a radio wave is less vulnerable to noise than the amplitude, FM was originally introduced to reduce noise and improve the quality of radio reception. In order to accomplish this, FM radio signals have bandwidth several times that of AM signals.
What are the methods of frequency modulation?
Modulation Method Definitions
- ASK (Amplitude Shift Keying)
- FSK (Frequency Shift Keying)
- O-QPSK (Offset-Quaternary Phase Shift Keying)
- OFDM (Orthogonal Frequency Division Multiplexing)
- DSSS (Direct Sequence Spread Spectrum)
What are the advantages and disadvantages of FM over AM?
Which modulation is better AM or FM?
FM is less prone to interference than AM. However, FM signals are impacted by physical barriers. FM has better sound quality due to higher bandwidth. In AM radio broadcasting, the modulating signal has bandwidth of 15kHz, and hence the bandwidth of an amplitude-modulated signal is 30kHz.