Amplitude and Frequency Modulation

What is the main difference between amplitude modulation and frequency modulation?

• Amplitude modulation varies the frequency of the carrier wave, while frequency modulation varies the amplitude of the carrier wave.

• Amplitude modulation and frequency modulation both vary the amplitude of the carrier wave.

• The main difference is that amplitude modulation varies the amplitude of the carrier wave, while frequency modulation varies the frequency of the carrier wave.

• Frequency modulation varies the phase of the carrier wave, while amplitude modulation varies the frequency of the carrier wave.

Explain how amplitude modulation works.

• Amplitude modulation works by varying the strength of the carrier wave in proportion to the waveform being transmitted.

• Amplitude modulation works by reducing the speed of the carrier wave.

• Amplitude modulation works by varying the frequency of the carrier wave.

• Amplitude modulation works by changing the phase of the carrier wave.

Describe the process of frequency modulation.

• Frequency modulation involves changing the frequency of the carrier wave based on the input signal's amplitude.

• Frequency modulation is only applicable to digital signals, not analog signals.

• Frequency modulation is a process that does not involve any changes in the carrier wave.

• Frequency modulation involves changing the amplitude of the carrier wave based on the input signal's frequency.

What is the advantage of frequency modulation over amplitude modulation?

• Higher cost and lower efficiency

• More susceptible to noise interference and worse sound quality

• Limited range and reduced coverage

• Less susceptible to noise interference and better sound quality

How does the bandwidth of a frequency modulated signal compare to an amplitude modulated signal?

• Frequency modulated signal and amplitude modulated signal have the same bandwidth.

• Amplitude modulated signal has a wider bandwidth compared to a frequency modulated signal.

• Bandwidth is not a factor in distinguishing between frequency modulated and amplitude modulated signals.

• Frequency modulated signal has a wider bandwidth compared to an amplitude modulated signal.

What is the equation for calculating the modulation index in amplitude modulation?

• Modulation Index = (Phase of modulating signal) / (Phase of carrier signal)

• Modulation Index = (Frequency of modulating signal) / (Frequency of carrier signal)

• Modulation Index = (Power of modulating signal) / (Power of carrier signal)

• Modulation Index = (Amplitude of modulating signal) / (Amplitude of carrier signal)

In frequency modulation, what parameter is varied with the input signal?

• phase

• frequency

• wavelength

• amplitude

What is the unit of measurement for modulation index?

• meters

• dimensionless

• seconds

• kilograms

What is the range of frequencies typically used for AM radio broadcasting?

• 200 kHz to 800 kHz

• 1000 kHz to 2000 kHz

• 300 kHz to 1200 kHz

• 535 kHz to 1705 kHz

Why is FM radio less prone to interference compared to AM radio?

• FM radio has weaker signal strength leading to less interference.

• AM radio has better modulation techniques for interference reduction.

• Frequency modulation provides better signal quality and noise rejection.

• AM radio uses a higher frequency range which causes more interference.