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Which is the process of encoding information from a message source in suitable manner for transmission?

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Which is the process of encoding information from a message source in suitable manner for transmission?

(a) Modulation

(b) Demodulation

(c) Encryption

(d) Decryption

I have been asked this question during an interview.

Question is from Frequency Modulation Vs. Amplitude Modulation in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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Right option is (a) Modulation

To explain I would say: Modulation is the process of encoding information from a message source in suitable manner for transmission. It translates the baseband message signal to a bandpass signal at frequencies that are very higher compared to the baseband frequency.

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