Frequency modulation (FM) has several advantages over other types of waves, such as unmodulated waves (continuous waves) and amplitude modulated (AM) waves. Here are some of the benefits of using frequency modulated waves for transmission purposes:
Improved signal quality: FM offers better signal quality compared to AM. FM signals are less susceptible to noise and interference, making them more resistant to disturbances during transmission. This results in clearer audio or data reception, especially over long distances.
Enhanced noise immunity: FM signals are less affected by amplitude variations caused by noise or atmospheric conditions. This is because FM relies on changes in frequency rather than amplitude, so variations in signal strength have less impact on the received signal quality. As a result, FM is better suited for situations where a reliable and noise-resistant transmission is required.
Greater bandwidth efficiency: FM signals occupy a narrower frequency bandwidth compared to AM signals for the same information-carrying capacity. This means that FM allows for more efficient use of the available frequency spectrum, enabling more simultaneous transmissions within a given frequency range.
Reduced electromagnetic interference: FM signals are less likely to cause electromagnetic interference (EMI) to other devices or systems. This is because the amplitude of the FM signal remains constant, avoiding sudden variations that could interfere with nearby electronic devices. FM is often used in applications where interference avoidance is critical, such as in radio broadcasting and aviation communication.
Better stereo audio transmission: FM is commonly used for high-fidelity stereo audio transmission. The stereo information is carried by modulating the FM signal with a separate subcarrier, resulting in a high-quality audio reproduction with good channel separation and minimal distortion.
Improved signal-to-noise ratio: FM offers a better signal-to-noise ratio compared to AM. The wideband noise in FM receivers is spread over a larger frequency range, resulting in a lower noise level per unit bandwidth. This leads to improved reception quality, especially in weak signal conditions.
These advantages make frequency modulation a preferred choice in various applications such as radio broadcasting, two-way radio communication, wireless audio transmission, and more, where signal quality, noise immunity, and efficient use of the frequency spectrum are crucial considerations.