What are the two types of angle modulation schemes?

Phase Modulation (PM) and Frequency Modulation (FM)

Fill in the blank: The total variation in frequency from the lowest to the highest point is called ______.

Carrier swing

True or False: In Frequency Modulation, the instantaneous frequency is varied linearly with the message signal.

True

Riddle: I change the frequency of a signal without affecting its amplitude; I’m known for my wide bandwidth. What am I?

Frequency Modulation (FM)

What is the modulation index for FM defined as?

The ratio of frequency deviation to the modulating frequency.

Which modulation technique is considered to have higher noise immunity?

Frequency Modulation (FM)

Fill in the blank: The method used for generating FM signals that does not respond directly to the modulating signal is called ______.

Armstrong method

True or False: Phase Modulation requires an integrator before the modulated signal is applied.

False. Phase Modulation does not require an integrator.

Riddle: I am the process where the phase angle varies with a modulating signal, but my amplitude stays constant. What am I?

Phase Modulation (PM)

What does the term 'per cent modulation' refer to in FM?

The ratio of actual frequency deviation to the maximum allowable frequency deviation.

What is the primary advantage of using Narrowband FM?

Lower noise and improved sensitivity.

Fill in the blank: The maximum frequency component of the message signal is represented as ______.

FM

True or False: The frequency deviation in FM is independent of the amplitude of the modulating signal.

True

Riddle: I am essential for recovering the original signal in FM, converting frequency variations to amplitude variations. What am I?

FM demodulator

What does Carson's formula provide in terms of angle modulation?

The effective bandwidth of an angle modulated signal.

Fill in the blank: In FM, the term ______ refers to the amount of frequency deviation caused by the modulating signal.

Frequency deviation

True or False: The modulation index for FM can never be greater than unity.

False. The modulation index may be greater than unity.

Riddle: I can generate both FM and PM, but I require a differentiator or an integrator depending on my type. What am I?

FM modulator

What is the relationship between PM and FM in terms of signal generation?

FM can be generated from PM and vice versa through appropriate signal processing.

Fill in the blank: The instantaneous frequency of an angle modulated signal is given by ______.

Ω = ωc + K m(t)

True or False: The carrier frequency in FM remains constant regardless of the modulation applied.

False. The carrier frequency varies with the modulating signal.

What is the primary disadvantage of the direct method of FM generation?

It does not provide high stability in carrier frequency.

Fill in the blank: The maximum audio frequency transmitted in FM broadcasting is ______.

15 kHz

True or False: Amplitude Modulation (AM) requires a wider channel than Frequency Modulation (FM).

False. FM requires a much wider channel than AM.

What kind of modulation technique is Frequency Shift Keying (FSK)?

Digital modulation technique using frequency modulation.

Riddle: I am the process that allows multiple signals to be transmitted over the same channel by using different frequencies. What am I?

Multiplexing

Fill in the blank: The output of a frequency modulator is represented as ______.

Ac cos [ωct + Kf m(t)]

Which of the following is a type of angle modulation? A) Amplitude Modulation B) Phase Modulation C) Pulse Modulation D) Time Division Modulation

B) Phase Modulation