Frequency Modulation (FM)

Frequency Modulation (FM) is the technique used to transmit audio signals in television broadcasts. It is a method of encoding information in a carrier wave by varying the frequency of the wave. FM is widely used in broadcasting because it has several advantages over other modulation techniques.

Advantages of FM

1. Improved Signal Quality: FM provides better signal quality compared to other modulation techniques like Amplitude Modulation (AM). This is because FM is less susceptible to noise and interference, resulting in clearer audio transmission.

2. Wide Frequency Range: FM signals can cover a wide frequency range, allowing for the transmission of high-fidelity audio. This is especially important in television broadcasts where high-quality audio is required to enhance the viewing experience.

3. Constant Amplitude: Unlike AM, FM signals have a constant amplitude. This means that changes in the strength of the received signal do not affect the quality of the audio. FM signals are also less affected by atmospheric conditions, making them more reliable for long-distance transmission.

4. Frequency Selectivity: FM receivers can selectively tune in to specific frequencies, allowing for the reception of multiple channels. This is achieved by adjusting the frequency of the receiver to match the desired channel, while ignoring other frequencies. This feature enables efficient use of the available frequency spectrum.

5. No Interference: FM signals are less susceptible to interference from electrical devices or other radio signals. This is because FM signals are less affected by changes in the amplitude of the carrier wave, which is the primary cause of interference in AM signals.

6. Low Power Consumption: FM receivers require relatively low power compared to other modulation techniques. This makes FM a cost-effective solution for television broadcasts, as it reduces power consumption and operational costs.

Conclusion

Frequency Modulation (FM) is the preferred technique for transmitting audio signals in television broadcasts due to its improved signal quality, wide frequency range, constant amplitude, frequency selectivity, low interference, and low power consumption. These advantages make FM a reliable and efficient method for delivering high-fidelity audio to viewers.