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What is the baseband bandwidth for a voice grade signal?

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What is the baseband bandwidth for a voice grade signal?

(a) atleast 10KHz

(b) atleast 5KHz

(c) approximately 3KHz

(d) approximately 15KHz

This question was posed to me in unit test.

This intriguing question comes from Multitone Wideband FM topic in section Angle Modulation of Analog Communications

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The correct answer is (c) approximately 3KHz

Best explanation: The fixed standard baseband bandwidth for a voice grade signal is approximately close to 3KHz.

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