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Which of the following are two methods for generating FM signal?

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Which of the following are two methods for generating FM signal?

(a) Coherent method, noncoherent method

(b) Product detector, envelope detector

(c) Direct method, indirect method

(d) Slope detector, Zero crossing detector

The question was asked by my school teacher while I was bunking the class.

The question is from Angle modulation in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct choice is (c) Direct method, indirect method

For explanation: Direct method and indirect method are the methods used for generating FM signals. These methods are differentiated by the variation of the carrier frequency.

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